San Fernando climate — normals and trends
San Fernando (United States) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 16.8 °C and it receives 402 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 (23.9 °C on average) and the coldest is January (10.4 °C). Rainfall peaks in February.
San Fernando averages 3 frost days, 72 hot days (≥ 30 °C) and 36 rainy days per year.
San Fernando has warmed by +1.8 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 6 to 0 per year over the period.
The hottest day of the period reached 44.9 °C (on 6 September 2020) and the coldest -5.0 °C (on 22 December 1990).
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 FernandoCalifornia
- coords
- 34.28°, -118.44°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.8°C
Average daily high
23.6°C
Average daily low
11.2°C
Annual rainfall
402mm
Sunshine / day
11.3h
Mean relative humidity
59%
Average peak wind
12.8km/h
Seasonal range
13.5°C
Frost days (< 0 °C)
3 d/yr
Hot days (≥ 30 °C)
72 d/yr
Rainy days (≥ 1 mm)
36 d/yr
Annual snowfall
1.0 cm
Average feels-like high
22.6 °C
Average feels-like low
9.7 °C
Average peak gust
33.0 km/h
Tropical nights (≥ 20 °C)
15 d/yr
Solar radiation
20.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.48 · 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
44.9 °C
6 September 2020
Coldest day
-5.0 °C
22 December 1990
Wettest day
119 mm
9 January 2005
Windiest day
35.1 km/h
2 January 2006
Strongest gust
87.8 km/h
25 February 2023
Hottest feels-like
45.0 °C
22 July 2006
Coldest feels-like
-9.4 °C
22 December 1990
Snowiest day
9.6 cm
8 February 1989
Sunniest day
14.0 h
2 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 | 18.4 °C | +1.6 °C | 18 mm | -64 mm |
| Feb | 19.6 °C | +2.0 °C | 95 mm | +6 mm |
| Mar | 18.2 °C | -0.9 °C | 60 mm | -10 mm |
| Apr | 20.8 °C | -0.9 °C | 12 mm | -17 mm |
| May | 24.4 °C | +0.3 °C | 6 mm | -3 mm |
| Jun | 27.2 °C | -0.1 °C | 1 mm | -1 mm |
| Jul | 28.2 °C | -2.6 °C | 0 mm | -1 mm |
| Aug | 31.1 °C | -0.1 °C | 0 mm | -2 mm |
| Sep | 28.8 °C | -1.0 °C | 25 mm | +19 mm |
| Oct | 25.0 °C | -0.9 °C | 59 mm | +45 mm |
| Nov | 20.9 °C | -0.2 °C | 138 mm | +102 mm |
| Dec | 20.2 °C | +2.9 °C | 148 mm | +88 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 Fernando?
San Fernando has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 16.8 °C and it receives 402 mm of precipitation per year.
What is the hottest day ever recorded in San Fernando?
The hottest day measured in San Fernando between 1940 and 2025 was 6 September 2020, reaching 44.9 °C.
What is the coldest day in San Fernando?
The coldest day measured in San Fernando between 1940 and 2025 was 22 December 1990, at -5.0 °C.
Does it snow in San Fernando?
Almost never: San Fernando sees virtually no snow, with about 3 frost days per year.
Has the climate of San Fernando warmed?
Yes: San Fernando warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in San Fernando?
The wettest day measured in San Fernando between 1940 and 2025 was 9 January 2005, with 119 mm of rain in 24 hours.
What was the windiest day in San Fernando?
The windiest day measured in San Fernando between 1940 and 2025 was 2 January 2006, with winds reaching 35.1 km/h.
What is the warmest month in San Fernando?
The warmest month in San Fernando is August (23.9 °C on average); the coldest is January (10.4 °C).
How much does it rain in San Fernando?
San Fernando receives on average 402 mm of precipitation per year, spread over about 36 rainy days.
Is it sunny in San Fernando?
San Fernando gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
What is the biggest single-day snowfall in San Fernando?
The heaviest 24-hour snowfall measured in San Fernando between 1940 and 2025 was 8 February 1989, with 9.6 cm.
Are there tropical nights in San Fernando?
Yes: San Fernando has on average 15 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in San Fernando?
In San Fernando, between 1940 and 2025, the highest apparent temperature reached 45.0 °C on 22 July 2006, and the lowest was -9.4 °C on 22 December 1990.
Compare San Fernando with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around San Fernando