San Clemente climate — normals and trends
San Clemente (United States) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 16.6 °C and it receives 387 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 (22.4 °C on average) and the coldest is January (11.6 °C). Rainfall peaks in February.
San Clemente averages 0 frost days, 24 hot days (≥ 30 °C) and 39 rainy days per year.
San Clemente has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The hottest day of the period reached 41.0 °C (on 6 July 2018) and the coldest -3.9 °C (on 16 January 1949).
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
San ClementeCalifornia
- coords
- 33.43°, -117.61°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.6°C
Average daily high
21.6°C
Average daily low
12.7°C
Annual rainfall
387mm
Sunshine / day
11.2h
Mean relative humidity
71%
Average peak wind
11.9km/h
Seasonal range
10.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
24 d/yr
Rainy days (≥ 1 mm)
39 d/yr
Annual snowfall
0.2 cm
Average feels-like high
21.7 °C
Average feels-like low
12.0 °C
Average peak gust
29.5 km/h
Tropical nights (≥ 20 °C)
17 d/yr
Solar radiation
20.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.46 · 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
41.0 °C
6 July 2018
Coldest day
-3.9 °C
16 January 1949
Wettest day
103 mm
20 December 2010
Windiest day
41.1 km/h
30 November 1982
Strongest gust
96.5 km/h
20 January 2017
Hottest feels-like
42.5 °C
6 September 2020
Coldest feels-like
-8.7 °C
16 January 1949
Snowiest day
5.0 cm
29 January 1957
Sunniest day
14.0 h
14 June 1940
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 | 18.2 °C | +1.3 °C | 24 mm | -54 mm |
| Feb | 18.9 °C | +1.8 °C | 65 mm | -18 mm |
| Mar | 16.8 °C | -0.9 °C | 74 mm | +11 mm |
| Apr | 18.8 °C | -0.6 °C | 18 mm | -11 mm |
| May | 21.9 °C | +0.9 °C | 6 mm | -3 mm |
| Jun | 24.5 °C | +0.6 °C | 1 mm | -1 mm |
| Jul | 25.4 °C | -1.8 °C | 0 mm | -1 mm |
| Aug | 28.3 °C | +0.6 °C | 1 mm | -2 mm |
| Sep | 26.6 °C | -0.3 °C | 10 mm | +3 mm |
| Oct | 23.8 °C | -0.2 °C | 27 mm | +11 mm |
| Nov | 21.2 °C | +0.7 °C | 127 mm | +89 mm |
| Dec | 20.3 °C | +2.9 °C | 71 mm | +13 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 San Clemente?
San Clemente has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 16.6 °C and it receives 387 mm of precipitation per year.
What is the hottest day ever recorded in San Clemente?
The hottest day measured in San Clemente between 1940 and 2025 was 6 July 2018, reaching 41.0 °C.
What is the coldest day in San Clemente?
The coldest day measured in San Clemente between 1940 and 2025 was 16 January 1949, at -3.9 °C.
Does it snow in San Clemente?
Almost never: San Clemente sees virtually no snow, with about 0 frost days per year.
Has the climate of San Clemente warmed?
Yes: San Clemente warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in San Clemente?
The wettest day measured in San Clemente between 1940 and 2025 was 20 December 2010, with 103 mm of rain in 24 hours.
What was the windiest day in San Clemente?
The windiest day measured in San Clemente between 1940 and 2025 was 30 November 1982, with winds reaching 41.1 km/h.
What is the warmest month in San Clemente?
The warmest month in San Clemente is August (22.4 °C on average); the coldest is January (11.6 °C).
How much does it rain in San Clemente?
San Clemente receives on average 387 mm of precipitation per year, spread over about 39 rainy days.
Is it sunny in San Clemente?
San Clemente gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
What is the biggest single-day snowfall in San Clemente?
The heaviest 24-hour snowfall measured in San Clemente between 1940 and 2025 was 29 January 1957, with 5.0 cm.
Are there tropical nights in San Clemente?
Yes: San Clemente has on average 17 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in San Clemente?
In San Clemente, between 1940 and 2025, the highest apparent temperature reached 42.5 °C on 6 September 2020, and the lowest was -8.7 °C on 16 January 1949.
Compare San Clemente with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around San Clemente