Grosseto climate — normals and trends
Grosseto (Italy) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 15.9 °C and it receives 738 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (24.4 °C on average) and the coldest is January (8.5 °C). Rainfall peaks in November.
Grosseto averages 2 frost days, 10 hot days (≥ 30 °C) and 94 rainy days per year.
Grosseto has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 4 to 0 per year over the period.
The hottest day of the period reached 34.9 °C (on 5 August 2003) and the coldest -5.8 °C (on 19 January 1940).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
GrossetoTuscany
- coords
- 42.76°, 11.11°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.9°C
Average daily high
18.8°C
Average daily low
13.1°C
Annual rainfall
738mm
Sunshine / day
10.3h
Mean relative humidity
76%
Average peak wind
18.3km/h
Seasonal range
15.9°C
Frost days (< 0 °C)
2 d/yr
Hot days (≥ 30 °C)
10 d/yr
Rainy days (≥ 1 mm)
94 d/yr
Annual snowfall
2.0 cm
Average feels-like high
18.4 °C
Average feels-like low
11.9 °C
Average peak gust
33.4 km/h
Tropical nights (≥ 20 °C)
56 d/yr
Solar radiation
15.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.52 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
34.9 °C
5 August 2003
Coldest day
-5.8 °C
19 January 1940
Wettest day
144 mm
4 November 1966
Windiest day
59.5 km/h
29 October 2018
Strongest gust
114.5 km/h
29 October 2018
Hottest feels-like
39.2 °C
5 August 2003
Coldest feels-like
-12.5 °C
23 January 1942
Snowiest day
10.8 cm
29 December 1996
Sunniest day
14.9 h
1 July 1950
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 13.5 °C | +2.5 °C | 44 mm | -26 mm |
| Feb | 14.2 °C | +2.3 °C | 112 mm | +47 mm |
| Mar | 15.7 °C | +1.7 °C | 90 mm | +30 mm |
| Apr | 18.5 °C | +1.9 °C | 62 mm | +5 mm |
| May | 21.9 °C | +1.4 °C | 41 mm | -1 mm |
| Jun | 29.1 °C | +4.6 °C | 1 mm | -24 mm |
| Jul | 29.3 °C | +1.7 °C | 24 mm | +11 mm |
| Aug | 29.5 °C | +1.7 °C | 50 mm | +21 mm |
| Sep | 25.5 °C | +1.0 °C | 99 mm | +25 mm |
| Oct | 21.0 °C | +0.8 °C | 65 mm | -41 mm |
| Nov | 16.2 °C | +0.7 °C | 75 mm | -38 mm |
| Dec | 14.0 °C | +1.9 °C | 77 mm | -9 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Grosseto?
Grosseto has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 15.9 °C and it receives 738 mm of precipitation per year.
What is the hottest day ever recorded in Grosseto?
The hottest day measured in Grosseto between 1940 and 2025 was 5 August 2003, reaching 34.9 °C.
What is the coldest day in Grosseto?
The coldest day measured in Grosseto between 1940 and 2025 was 19 January 1940, at -5.8 °C.
Does it snow in Grosseto?
Yes. Grosseto gets on average 2.0 cm of snow per year and has around 2 frost days.
Has the climate of Grosseto warmed?
Yes: Grosseto warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Grosseto?
The wettest day measured in Grosseto between 1940 and 2025 was 4 November 1966, with 144 mm of rain in 24 hours.
What was the windiest day in Grosseto?
The windiest day measured in Grosseto between 1940 and 2025 was 29 October 2018, with winds reaching 59.5 km/h.
What is the warmest month in Grosseto?
The warmest month in Grosseto is August (24.4 °C on average); the coldest is January (8.5 °C).
How much does it rain in Grosseto?
Grosseto receives on average 738 mm of precipitation per year, spread over about 94 rainy days.
Is it sunny in Grosseto?
Grosseto gets on average 10.3 hours of sunshine per day, roughly 3,760 hours per year over 1940-2025.
What is the biggest single-day snowfall in Grosseto?
The heaviest 24-hour snowfall measured in Grosseto between 1940 and 2025 was 29 December 1996, with 10.8 cm.
Are there tropical nights in Grosseto?
Yes: Grosseto has on average 56 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Grosseto?
In Grosseto, between 1940 and 2025, the highest apparent temperature reached 39.2 °C on 5 August 2003, and the lowest was -12.5 °C on 23 January 1942.
Compare Grosseto with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Grosseto