Castelsardo climate — normals and trends
Castelsardo (Italy) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 16.0 °C and it receives 615 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 (23.4 °C on average) and the coldest is January (10.2 °C). Rainfall peaks in November.
Castelsardo averages 0 frost days, 1 hot days (≥ 30 °C) and 97 rainy days per year.
Castelsardo has warmed by +1.6 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The hottest day of the period reached 35.1 °C (on 24 July 2023) and the coldest 0.2 °C (on 22 January 1963).
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
CastelsardoSardinia
- coords
- 40.91°, 8.71°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.0°C
Average daily high
17.8°C
Average daily low
14.4°C
Annual rainfall
615mm
Sunshine / day
10.6h
Mean relative humidity
77%
Average peak wind
23.8km/h
Seasonal range
13.2°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
97 d/yr
Annual snowfall
1.4 cm
Average feels-like high
17.0 °C
Average feels-like low
12.4 °C
Average peak gust
39.4 km/h
Tropical nights (≥ 20 °C)
65 d/yr
Solar radiation
16.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.47 · 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
35.1 °C
24 July 2023
Coldest day
0.2 °C
22 January 1963
Wettest day
55 mm
14 October 2000
Windiest day
73.2 km/h
29 October 2018
Strongest gust
125.6 km/h
29 October 2018
Hottest feels-like
37.1 °C
16 July 2003
Coldest feels-like
-10.1 °C
10 February 1986
Snowiest day
6.3 cm
9 January 1985
Sunniest day
14.9 h
29 June 2025
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 | 13.6 °C | +1.9 °C | 55 mm | -17 mm |
| Feb | 13.7 °C | +1.9 °C | 37 mm | -29 mm |
| Mar | 14.9 °C | +1.8 °C | 78 mm | +19 mm |
| Apr | 16.6 °C | +1.5 °C | 113 mm | +59 mm |
| May | 19.8 °C | +1.5 °C | 19 mm | -21 mm |
| Jun | 26.0 °C | +4.0 °C | 0 mm | -17 mm |
| Jul | 26.6 °C | +1.9 °C | 5 mm | -1 mm |
| Aug | 26.6 °C | +1.3 °C | 11 mm | -1 mm |
| Sep | 24.2 °C | +1.1 °C | 36 mm | -2 mm |
| Oct | 20.7 °C | +0.8 °C | 42 mm | -25 mm |
| Nov | 17.0 °C | +1.1 °C | 69 mm | -28 mm |
| Dec | 14.6 °C | +1.6 °C | 87 mm | -1 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 Castelsardo?
Castelsardo has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 16.0 °C and it receives 615 mm of precipitation per year.
What is the hottest day ever recorded in Castelsardo?
The hottest day measured in Castelsardo between 1940 and 2025 was 24 July 2023, reaching 35.1 °C.
What is the coldest day in Castelsardo?
The coldest day measured in Castelsardo between 1940 and 2025 was 22 January 1963, at 0.2 °C.
Does it snow in Castelsardo?
Yes. Castelsardo gets on average 1.4 cm of snow per year and has around 0 frost days.
Has the climate of Castelsardo warmed?
Yes: Castelsardo warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Castelsardo?
The wettest day measured in Castelsardo between 1940 and 2025 was 14 October 2000, with 55 mm of rain in 24 hours.
What was the windiest day in Castelsardo?
The windiest day measured in Castelsardo between 1940 and 2025 was 29 October 2018, with winds reaching 73.2 km/h.
What is the warmest month in Castelsardo?
The warmest month in Castelsardo is August (23.4 °C on average); the coldest is January (10.2 °C).
How much does it rain in Castelsardo?
Castelsardo receives on average 615 mm of precipitation per year, spread over about 97 rainy days.
Is it sunny in Castelsardo?
Castelsardo gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.
What is the biggest single-day snowfall in Castelsardo?
The heaviest 24-hour snowfall measured in Castelsardo between 1940 and 2025 was 9 January 1985, with 6.3 cm.
Are there tropical nights in Castelsardo?
Yes: Castelsardo has on average 65 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Castelsardo?
In Castelsardo, between 1940 and 2025, the highest apparent temperature reached 37.1 °C on 16 July 2003, and the lowest was -10.1 °C on 10 February 1986.
Compare Castelsardo with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Castelsardo