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last updated: Aug 16, 10:15 PM
Cagliari has warmed by +0.8°C: its 1991–2020 climate normal is +0.8°C higher than the 1961–1990 one. The long-term trend is +0.15°C per decade. Source: ERA5 reanalysis (ECMWF/Copernicus), series since 1940.
Comparing the two 30-year climate normals (the WMO standard), Cagliari went from an average of 16.44° in 1961–1990 to 17.25° in 1991–2020: a change of +0.81°C. The underlying trend (1940–2025) is +0.15°C per decade (±0.05, 95% confidence interval) and is a clear signal (R² = 0.29).
Cagliari is the 75th fastest-warming city in Italy, out of 107 monitored.
Within Sardegna it's 3rd of 4.
See the full ranking →Every number on this page comes from the ERA5 reanalysis — a physical model that blends satellite and station data. Here we apply the exact same calculation (1991–2020 normal minus 1961–1990 normal) to a different, independent source: E-OBS, built solely from direct European weather-station observations (ECA&D/Copernicus project), not a model.
Both sources agree the warming is real: +0.81°C according to ERA5, +1.10°C according to E-OBS.
Don't expect the two numbers to match exactly: they're computed with different methods (model vs. direct observations), different resolutions, and different station networks — a difference of a few tenths of a degree is normal, not an error. What matters is that neither source contradicts the other on the direction of change.
E-OBS 1961–1990 normal computed on 30 available years, 1991–2020 normal on 30. · E-OBS 15.5° → 16.6°
E-OBS source: E-OBS data: EU-FP6 project UERRA and the Copernicus Climate Change Service; data providers: the ECA&D project (ecad.eu). Source: Cornes, R., G. van der Schrier, E.J.M. van den Besselaar, and P.D. Jones. 2018: An Ensemble Version of the E-OBS Temperature and Precipitation Datasets.
2025 was the 1st hottest year in Cagliari out of 86 since 1940. Among the hottest ever.
Cagliari's average annual temperature today matches what Lecce had in the 2000s — vs .
Cagliari has warmed by +0.8°C: its 1991–2020 climate normal is +0.8°C higher than the 1961–1990 one. The long-term trend is +0.15°C per decade. Source: ERA5 reanalysis (ECMWF/Copernicus), series since 1940.
Yes. Between the 1961–1990 and 1991–2020 climate normals, the mean temperature of Cagliari rose by +0.8°C, at +0.15°C per decade.
The highest value ever recorded is 41.4°C, on July 22, 1983.
2025, with a mean temperature of 18.8°C.
With 28° in Cagliari today, take comfort: on July 22, 1983 (43 years ago) it hit 41.4° here — the all-time record of the series since 1940.
One year per stripe, from 1940 to today: blue below the 1961–1990 normal, red above.
The real milestones of Cagliari's climate history, in chronological order: only measured records and extreme years, from ERA5 data.
How much warmer (red) or colder (blue) each year was than the climate normal. The dashed line is the trend.
Aggregating by decade, annual noise disappears and the underlying trend remains.
The hottest year was 2025 (18.77°), the coolest 1956 (15.58°). Thick line = 10-year moving average.
Average highs, average lows and average daily mean for each month of the year.
Daily highs and lows. Last available historical data point: July 6, 2026.
Days with a high ≥30° and nights with a low ≥20°. It's the mugginess you feel on your skin: the chart shows how it has changed.
💡 In plain terms: compared to 1961–1990, there are roughly 4 extra weeks of heat above 30° every year.
Estimate based on the monthly climatology of the whole 1940–today series (not the official day-by-day DPR 412/93 calculation): indicative climate zone D. Two declared approximations: an 85-year average (includes the colder past, so it tends to overstate vs today's climate) and monthly resolution (a month averaging above 20° counts as zero even if it has days below the threshold, understating shoulder seasons). May differ from the municipality's official value.
Higher = colder/longer winters, more heating needed at home.
The duration record: the longest run of consecutive days with a high ≥35° since 1940.
July 21, 1983 – July 30, 1983 · peak 41.4°
The duration record: the longest run of consecutive nights with a low ≤0° since 1940.
January 29, 1963 – January 30, 1963 · low -0.8°
Same two-normal comparison (1961–1990 vs 1991–2020), but split between daytime highs and nighttime lows: they often don't rise at the same pace.
In Cagliari highs and lows rose in a similar way (+0.8°C vs +0.8°C).
Pick any date — from 1940 to a few days ago — and see what the weather was like: a wedding day, a birthday, a memory.
Source: Open-Meteo · ERA5 historical record (ECMWF). Series from 1940.