Italy's 2026 Heatwave: 27 of 27 Cities on Red Alert, Deaths 2% Above Expected, and No Measure of What It Did to Tourism

What a level-3 bulletin is, and what it does not do

The Ministry of Health issues the heat bulletin each weekday from late May to mid-September. It covers 27 cities and gives each one a level from 0 to 3 for the day of issue and the following two days. Saturday bulletins appear only during exceptional heat. The page itself says that for Bologna and Turin readers should use the regional environmental agencies' bulletins, though both cities still appear in the table.

The levels are defined on the Ministry's risk page, updated on 24 May 2026. Level 0 means no risk. Level 1 is a pre-alert for weather conditions that can precede a heatwave. Level 2 means weather that can be a risk to health, particularly in the most susceptible groups. Level 3 means emergency conditions, a heatwave, with possible negative effects on the health of healthy, active people and not only on groups at risk such as older people, very young children and people with chronic illnesses. The page publishes no numeric temperature thresholds.

A level-3 bulletin is therefore a health warning. It does not close museums, beaches or archaeological sites, and it places no restriction on travel. It is issued for a municipality and its population, though the Ministry advises travellers to check the forecast for their destination. It says nothing directly about a resort on the coast, an island or a mountain valley outside those 27 cities. Venice, Florence and Rome are in the list. The Amalfi Coast, Sardinia's beaches and the Dolomites are not.

Press coverage in Italy uses the colour code: yellow for level 1, orange for level 2 and red, the "bollino rosso", for level 3. International coverage translated that as "red alert", and Ahrefs first recorded the US query "italy extreme heatwave red alert" on 1 August 2026. The phrase sounds like an order. In the Ministry's own terms it is health advice: at level 3 the risk extends beyond older people, very young children and the chronically ill to healthy, active adults.

Twenty-seven cities in six days: the August peak in the archive

The Ministry's archive keeps every bulletin. Read for the first week of August 2026, it shows the peak building and breaking. On Monday 3 August, 25 cities were at level 3 and Messina and Reggio Calabria were at level 1. On 4 and 5 August the same 25 stayed at level 3 while the two Strait cities rose to level 2. On Thursday 6 August all 27 were at level 3.

The decline began the next day. On 7 August Bolzano dropped to level 1 and 26 cities remained at level 3. On Saturday 8 August, an exceptional weekend issue, eight northern and island cities fell to level 1: Bolzano, Brescia, Cagliari, Milan, Turin, Trieste, Venice and Verona. That left 19 at level 3, including Rome, Florence, Naples, Palermo and Catania. Two days earlier, the 6 August bulletin had forecast 21 for that Saturday; the 7 August bulletin revised the forecast to 19. Across the six bulletins, 147 of 162 possible city-days were at level 3, or 90.7%, by our count.

The same archive, which goes back to 2023, allows a season comparison. Summing the issue-day column across every bulletin, the 27 cities spent 549 city-days at level 3 in 2026. The figure was 173 in 2025, 276 in 2024 and 266 in 2023. The seasons are not the same length: 88 bulletins in 2026, 83 in 2025, 78 in 2024 and 72 in 2023. Per bulletin, the average was 6.2 cities at level 3 in 2026, against 2.1 in 2025, 3.5 in 2024 and 3.7 in 2023. In 2026, 48 of 88 bulletins had at least one city at level 3. The 27-city peak is the highest in the online archive; the previous peaks were 23 cities on 19 July 2023, 22 on 14 August 2024 and 20 on 4 July 2025.

The 2026 alerts came in clusters. Between 22 June and 1 July, between 12 and 25 cities were at level 3 on each bulletin. From 16 to 21 July the count was 14 to 18. The longest run came from 31 July to 13 August, with 25 to 27 cities on 3 to 6 August and 18 or 19 on 10 to 13 August. The season report lists five heatwave episodes in all: 25 to 30 May; the second half of June into early July, mainly in the centre-north; mid-July; late July to mid-August, the longest and most intense and covering the whole country; and the last week of August into early September, in the centre-south only.

The cities most visitors know were on the list often. Florence was at level 3 in 32 of the 88 bulletins, Perugia in 31, Rome and Campobasso in 29, and Palermo in 26. Naples was at level 3 in 16, Milan in 15 and Venice in 13. Trieste had the fewest, at 7. Readers planning a summer in Rome or Florence should read these as counts of weekday bulletins: weekends are mostly missing, so the true number of alert days is higher.

The season report gives its own count of days at level 2 or 3: on average 45 days in the cities of the centre and 35 in both the north and the south. It also says the 2026 alert days were "di gran lunga superiori", far higher, than in previous years, with 2025 the exception to a rising trend. Our archive totals agree in direction. They should not be read as more precise than the report's, because they use one column of a forecast bulletin.

A record summer, measured three different ways

Aeronautica Militare, the air force's meteorological service, publishes anomalies for its network of 88 stations against the 1991-2020 average. Summer 2026 came out at +2.8 °C. That is the highest since the series began in 1961 and 0.3 °C above summer 2003, the previous record at +2.5 °C. June was +2.6 °C and ranked fourth. July was +2.5 °C, the hottest July in the series. August was +3.1 °C, the hottest August in the series.

The regional split matters for anyone comparing 2026 with 2003. The north was +2.9 °C and the south +2.6 °C, both above their 2003 values by 0.2 °C and 0.3 °C. The centre was +2.8 °C, which is 0.2 °C below 2003. So summer 2026 broke the national record without breaking it everywhere.

A second national series points the same way. The National Research Council's bioeconomy institute, CNR-IBE, analysed the ERA5-Land reanalysis and, as reported by Quotidiano Sanità on 7 September 2026, put the summer mean at 24.3 °C, the warmest since 1950. Its August mean was 25.6 °C, 3.5 °C above the 1991-2020 average and above the previous August records of 24.6 °C in 2024 and 24.0 °C in 2017. A third source, the EU's Copernicus Climate Change Service, rates summer 2026 the warmest on record for western Europe, at +2.54 °C, but its box is drawn from 11°W to 15°E and 37° to 55°N, so it is not an Italian figure.

The series disagree on one point. A Ministry of Health news item of 20 August 2026 described July as the second hottest on record. Aeronautica Militare ranks July 2026 the hottest July since 1961. The Ministry item does not say which series it used. We report both and do not choose between them. None of the three temperature series is a tourism measure, and none says how many visitors were exposed.

What the Ministry measured: deaths, emergency visits and the over-85s

The Ministry's season report covers 25 May to 15 September 2026 and was published on 13 October. It compares deaths observed in 54 cities with the number expected, using the average of the same week and weekday in 2016 to 2025 as the baseline.

Over the whole period deaths were 2% above expected; the report's city tables cover people aged 65 and over. The excess was 4% in the centre-south, and deaths in the north were in line with expected. The excess fell almost entirely on the oldest group. Among people aged 85 and over, deaths were 10% above expected, 10% in the north and 11% in the centre-south. Among people aged 65 to 74 and 75 to 84 they were below expected.

The monthly pattern does not follow the temperature record in a straight line. From 25 May to 30 June deaths were 2% above expected in the north and 5% above in the centre-south. July, the hottest July in Aeronautica Militare's series, was in line with expected. In August the excess appeared only in the centre-south, at 6%. September showed an excess only in the centre-south, at 4%.

The city tables give deaths among people aged 65 and over. Rome recorded 6,944 deaths against 6,618 expected, a rise of about 5%. Palermo recorded 1,759 against 1,602, about 10%. Both are marked as statistically significant. The report marks eight cities with a significant rise in all: Turin, Padua, Rome, Latina, Bari, Palermo, Catania and Cagliari. Naples was 1% above expected, Milan level, Florence about 2% below and Venice about 6% below. The northern cities together recorded 16,346 against 16,364 expected.

Emergency-department visits showed no relevant change during the heatwaves in the 11 sentinel cities, according to the report. It notes slight increases in Venice, Rome and Perugia in July, and in Bologna, Genoa and Reggio Calabria in August. Its conclusion is a comparison: "In Italia, rispetto ad altri paesi europei l'impatto dell'estate 2026 sulla mortalità è stato contenuto." Compared with other European countries, the impact of summer 2026 on mortality in Italy was contained.

Some press reports during the summer gave other mortality figures. Il Post on 6 September 2026 reported a June rise of about 3% among over-65s nationally, from the same surveillance system. Dire on 20 August reported July mortality among the over-85s up by about 8%. Those figures cover different periods and age groups from the season report. They are not added to it here, and the season report is the Ministry's final summary for the summer.

What nobody measured: the tourists

No official statistic connects the 2026 heat to tourism. ISTAT, the Bank of Italy, ENIT, the Ministry of Tourism and Eurostat publish no series of arrivals, nights or spending attributed to weather. The Ministry of Health's surveillance counts residents. We found no public figure for tourists treated for heat illness, no count of cancellations and no estimate of arrivals lost.

Two numbers are widely attached to the heat in its place. The first is a forecast. Assoturismo-CST, the tourism research arm of the Confesercenti trade association, surveyed more than 1,000 accommodation operators and on 3 August 2026 forecast over 96.7 million overnight stays for August, 1.1% more than August 2025. It expected art cities to grow by only 0.3% and said their demand was penalised by high temperatures. That forecast was published three days before the 27-city peak and records operators' expectations.

The second is a model. Istituto Demoskopika estimated, in a report previewed by ANSA on 15 October 2026, that up to 3.7 million summer overnight stays, 2.3% of summer presences, are at risk in a typical summer today compared with a summer under 1990s climate conditions. It counts days with a perceived temperature of 33 °C or more in July and August: about 18 of 62 in the 1990s, about 30 in the last decade and about 35 projected for 2027 to 2036. It puts the net cost at up to €214 million a year, €294 million lost in summer against €80 million gained in spring and autumn. Calabria, Puglia and Emilia-Romagna top its vulnerability index at 79.8, 78.2 and 77.7. The full report was not available to us, and the estimate describes a climate, not the 2026 season.

There is one measured count for the hottest months. Eurostat's monthly series, which the site's 2026 record watch tracks, shows nights in Italian accommodation up 1.70% in July 2026 and 3.32% in August on the same months of 2025. Nights by non-residents rose 5.71% in July and 6.82% in August. Nights by residents fell 3.08% in July and rose 0.33% in August. These are totals. They carry the effect of prices, flight capacity, the calendar and every other influence at once, and they cannot show what August would have looked like in a cooler summer.

The series has met this kind of trap before. In our analysis of Catania airport's 2026 closures, a fall in August passengers turned out to be an Etna closure story. A single month that moves in step with a headline does not show cause. Here the totals moved up during the hottest summer in Aeronautica Militare's series, and that proves nothing about heat in either direction.

Measures on the ground: night tours, closed museums and outdoor-work bans

What happened at visitor sites was decided locally. In Genoa the Comune's museum service closed three venues on days of the 7 to 10 August level-3 alert. The Chiossone Museum of Oriental Art and Villa Giannettino Luxoro closed on 7, 8 and 9 August. Casa Mazzini, the Risorgimento museum, closed on 7, 8 and 10 August. The notice cites the Ministry's level-3 bulletin as the reason.

In Rome the response was to open later. AFP reported on 14 August 2026 that the Colosseum Archaeological Park had extended its night tours to 11pm on four evenings a week, Tuesday, Thursday, Friday and Saturday, up from two, with up to 275 visitors per tour and funding from the Ministry of Culture. AFP said the programme could run into September and that the Colosseum draws up to 20,000 visitors a day in peak season. We did not find the park's own notice. For Pompeii we found no 2026 heat notice; a widely shared "cool itineraries" item dates from 2023.

For workers, nine regions issued ordinances banning outdoor work between 12:30 and 16:00 on days of high heat risk, according to a QuiFinanza report of 17 June 2026: Lombardy, Piedmont, Liguria, Emilia-Romagna, Tuscany, Lazio, Veneto, Friuli-Venezia Giulia and Puglia. The trigger is the high-risk level on the Worklimate forecasting portal, a separate system from the Ministry's bulletin. The ordinances themselves were not opened for this article.

Access rules of this kind are a recurring theme in the series. Our report on Dolomites turnstiles, tolls and quotas found measures with several owners and almost no published results. Heat measures look similar. Each museum, park and region acts on its own, and none publishes what its measure changed for visitors.

The calendar the heat fell on

Italy's peak heat and peak tourism share the same weeks. In Eurostat's monthly series, July and August 2025 together held 183.5 million of the year's 535.5 million nights in Italian accommodation, or 34.3%. August alone had about 4.8 times the nights of November. Both shares are derived by us from Eurostat tour_occ_nim, and they describe 2025, before the 2026 heat.

That overlap is the reason the measurement gap matters. In 2026 the longest heatwave episode ran from late July to mid-August, which is also when the largest number of visitors is in the country. A third of the year's nights fall in the two months when the Ministry's bulletin is most likely to show level 3. Yet the health surveillance behind the alerts counts residents, and the tourism statistics count stays without asking why anyone came or stayed away.

The comparison with 2025 shows how much one summer can differ from the next. In 2025 the bulletin cities spent 173 city-days at level 3, and the peak was 20 cities on 4 July. In 2026 they spent 549 and the peak was all 27. The season report itself describes 2025 as the exception in a rising trend. One cool summer and one record summer give no basis for a forecast, and the Ministry offers none.

Claims that did not hold

Several figures circulated during and after the heatwave that the primary sources do not support, or support only in part. The panel below sets each one against the Ministry's archive, its own reports and the original publishers.

What this means for travelers, businesses and analysts

Travellers. A level-3 bulletin is a health warning for 27 cities, aimed at their population, and the Ministry advises travellers to check it for their destination. It does not close anything, so check each museum or site's own notice, as Genoa's museum visitors had to in August 2026. The 2026 alerts clustered in late June, mid-July and from late July to mid-August, and Florence, Perugia and Rome were among the cities on level 3 most often. The Ministry's level-3 advice is to avoid heat and direct sun between 11:00 and 18:00 and to avoid intense outdoor exercise in those hours. Rome's later opening hours at the Colosseum show the most useful adjustment: move outdoor sightseeing to the morning and evening. Our Palermo travel guide and Rome and Florence guides cover the sights where that matters most.

Tourism businesses and investors. The binding fact is the overlap: July and August held 34.3% of Italy's 2025 accommodation nights, and those are the months of the longest heat episodes. Measured August 2026 nights rose 3.32% on Eurostat's count. That is no published evidence of a collapse, and no evidence of resilience either, because nothing isolates heat. Demoskopika's model points at the coastal south as most exposed, with Calabria and Puglia at the top of its index, and at shoulder months as the gain. Anyone underwriting a summer-only business on that model should note that its full method has not been published. A published heat-attributed series from ISTAT, the Bank of Italy or a regional observatory would change this assessment.

Journalists and analysts. Safe to cite, with publisher and scope: 27 of 27 bulletin cities at level 3 on 6 August 2026 (Ministry of Health archive); deaths 2% above expected in 54 cities from 25 May to 15 September, with +10% among over-85s and an impact the Ministry called contained (season report, 13 October 2026); a summer anomaly of +2.8 °C against 1991-2020, the hottest since 1961 (Aeronautica Militare, 88 stations). Do not cite "21 cities" for 8 August (it was a forecast, later revised), "never happened before" for the 27-city peak, the August "record" as a measured outcome, or 3.7 million nights at risk as 2026 losses. Do not describe a level-3 bulletin as a closure order or a tourism measure. The series finding this article adds is a measurement gap: Italy counts heat alerts and deaths among residents and counts tourist nights, and it publishes nothing that connects the two.