Nettuno climate — normals and trends
Nettuno (Italy) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 16.0 °C and it receives 985 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 (24.2 °C on average) and the coldest is January (9.0 °C). Rainfall peaks in November.
Nettuno averages 1 frost days, 3 hot days (≥ 30 °C) and 115 rainy days per year.
Nettuno has warmed by +1.7 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The number of frost days there went from about 2 to 0 per year over the period.
The hottest day of the period reached 32.4 °C (on 25 August 2007) and the coldest -4.8 °C (on 14 January 1968).
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
NettunoLazio
- coords
- 41.46°, 12.66°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.0°C
Average daily high
18.4°C
Average daily low
13.7°C
Annual rainfall
985mm
Sunshine / day
10.2h
Mean relative humidity
78%
Average peak wind
17.0km/h
Seasonal range
15.2°C
Frost days (< 0 °C)
1 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
115 d/yr
Annual snowfall
1.9 cm
Average feels-like high
18.2 °C
Average feels-like low
12.9 °C
Average peak gust
29.9 km/h
Tropical nights (≥ 20 °C)
68 d/yr
Solar radiation
15.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °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
32.4 °C
25 August 2007
Coldest day
-4.8 °C
14 January 1968
Wettest day
101 mm
18 September 1952
Windiest day
57.8 km/h
29 October 2018
Strongest gust
106.6 km/h
28 December 1999
Hottest feels-like
37.6 °C
25 July 2023
Coldest feels-like
-10.5 °C
14 January 1968
Snowiest day
7.6 cm
18 February 1956
Sunniest day
14.3 h
9 July 2021
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 | +2.2 °C | 71 mm | -30 mm |
| Feb | 13.8 °C | +2.0 °C | 92 mm | -5 mm |
| Mar | 15.3 °C | +1.8 °C | 108 mm | +26 mm |
| Apr | 17.7 °C | +1.8 °C | 70 mm | -2 mm |
| May | 20.8 °C | +1.2 °C | 46 mm | -5 mm |
| Jun | 27.6 °C | +4.2 °C | 5 mm | -25 mm |
| Jul | 28.1 °C | +1.8 °C | 14 mm | -2 mm |
| Aug | 27.9 °C | +1.2 °C | 43 mm | +10 mm |
| Sep | 25.2 °C | +1.5 °C | 147 mm | +61 mm |
| Oct | 20.5 °C | +0.5 °C | 98 mm | -33 mm |
| Nov | 16.5 °C | +0.8 °C | 124 mm | -37 mm |
| Dec | 14.4 °C | +1.9 °C | 80 mm | -47 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 Nettuno?
Nettuno has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 16.0 °C and it receives 985 mm of precipitation per year.
What is the hottest day ever recorded in Nettuno?
The hottest day measured in Nettuno between 1940 and 2025 was 25 August 2007, reaching 32.4 °C.
What is the coldest day in Nettuno?
The coldest day measured in Nettuno between 1940 and 2025 was 14 January 1968, at -4.8 °C.
Does it snow in Nettuno?
Yes. Nettuno gets on average 1.9 cm of snow per year and has around 1 frost days.
Has the climate of Nettuno warmed?
Yes: Nettuno warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Nettuno?
The wettest day measured in Nettuno between 1940 and 2025 was 18 September 1952, with 101 mm of rain in 24 hours.
What was the windiest day in Nettuno?
The windiest day measured in Nettuno between 1940 and 2025 was 29 October 2018, with winds reaching 57.8 km/h.
What is the warmest month in Nettuno?
The warmest month in Nettuno is August (24.2 °C on average); the coldest is January (9.0 °C).
How much does it rain in Nettuno?
Nettuno receives on average 985 mm of precipitation per year, spread over about 115 rainy days.
Is it sunny in Nettuno?
Nettuno gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.
What is the biggest single-day snowfall in Nettuno?
The heaviest 24-hour snowfall measured in Nettuno between 1940 and 2025 was 18 February 1956, with 7.6 cm.
Are there tropical nights in Nettuno?
Yes: Nettuno has on average 68 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Nettuno?
In Nettuno, between 1940 and 2025, the highest apparent temperature reached 37.6 °C on 25 July 2023, and the lowest was -10.5 °C on 14 January 1968.
Compare Nettuno with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Nettuno