San Diego climate — normals and trends
San Diego (Colombia) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 24.5 °C and it receives 3,665 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 (25.4 °C on average) and the coldest is January (23.7 °C). Rainfall peaks in May.
San Diego averages 0 frost days, 95 hot days (≥ 30 °C) and 274 rainy days per year.
San Diego has warmed by +2.1 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The hottest day of the period reached 34.6 °C (on 24 July 1997) and the coldest 15.2 °C (on 11 January 1946).
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 DiegoCesar Department
- coords
- 10.33°, -73.18°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
24.5°C
Average daily high
28.7°C
Average daily low
21.1°C
Annual rainfall
3,665mm
Sunshine / day
9.6h
Mean relative humidity
75%
Average peak wind
7.5km/h
Seasonal range
1.7°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
95 d/yr
Rainy days (≥ 1 mm)
274 d/yr
Annual snowfall
0.0 cm
Average feels-like high
33.0 °C
Average feels-like low
23.4 °C
Average peak gust
28.0 km/h
Tropical nights (≥ 20 °C)
299 d/yr
Solar radiation
18.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.3 °C per decade · r² = 0.65 · 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
34.6 °C
24 July 1997
Coldest day
15.2 °C
11 January 1946
Wettest day
201 mm
5 May 1955
Windiest day
19.2 km/h
3 January 2015
Strongest gust
66.6 km/h
1 October 2016
Hottest feels-like
41.2 °C
6 September 2009
Coldest feels-like
14.6 °C
1 January 1955
Sunniest day
12.1 h
22 May 2022
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 | 29.2 °C | +0.5 °C | 47 mm | -4 mm |
| Feb | 29.3 °C | +0.3 °C | 42 mm | -38 mm |
| Mar | 30.0 °C | +1.0 °C | 57 mm | -105 mm |
| Apr | 29.6 °C | +1.0 °C | 565 mm | +174 mm |
| May | 29.6 °C | +1.2 °C | 438 mm | -131 mm |
| Jun | 29.6 °C | +0.8 °C | 380 mm | -28 mm |
| Jul | 30.7 °C | +1.0 °C | 198 mm | -68 mm |
| Aug | 30.5 °C | +0.8 °C | 306 mm | -33 mm |
| Sep | 30.1 °C | +1.0 °C | 444 mm | +18 mm |
| Oct | 28.6 °C | +0.6 °C | 389 mm | -127 mm |
| Nov | 29.3 °C | +1.7 °C | 266 mm | -71 mm |
| Dec | 28.7 °C | +0.5 °C | 84 mm | -37 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 Diego?
San Diego has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 24.5 °C and it receives 3,665 mm of precipitation per year.
What is the hottest day ever recorded in San Diego?
The hottest day measured in San Diego between 1940 and 2025 was 24 July 1997, reaching 34.6 °C.
What is the coldest day in San Diego?
The coldest day measured in San Diego between 1940 and 2025 was 11 January 1946, at 15.2 °C.
Does it snow in San Diego?
Almost never: San Diego sees virtually no snow, with about 0 frost days per year.
Has the climate of San Diego warmed?
Yes: San Diego warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in San Diego?
The wettest day measured in San Diego between 1940 and 2025 was 5 May 1955, with 201 mm of rain in 24 hours.
What was the windiest day in San Diego?
The windiest day measured in San Diego between 1940 and 2025 was 3 January 2015, with winds reaching 19.2 km/h.
What is the warmest month in San Diego?
The warmest month in San Diego is August (25.4 °C on average); the coldest is January (23.7 °C).
How much does it rain in San Diego?
San Diego receives on average 3,665 mm of precipitation per year, spread over about 274 rainy days.
Is it sunny in San Diego?
San Diego gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.
Are there tropical nights in San Diego?
Yes: San Diego has on average 299 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in San Diego?
In San Diego, between 1940 and 2025, the highest apparent temperature reached 41.2 °C on 6 September 2009, and the lowest was 14.6 °C on 1 January 1955.
Compare San Diego with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around San Diego