Oceanside climate — normals and trends
Oceanside (United States) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 16.9 °C and it receives 294 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 (21.3 °C on average) and the coldest is January (13.2 °C). Rainfall peaks in February.
Oceanside averages 0 frost days, 2 hot days (≥ 30 °C) and 35 rainy days per year.
Oceanside has warmed by +1.4 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The hottest day of the period reached 37.3 °C (on 4 September 1988) and the coldest 2.7 °C (on 4 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
OceansideCalifornia
- coords
- 33.20°, -117.38°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.9°C
Average daily high
19.7°C
Average daily low
14.5°C
Annual rainfall
294mm
Sunshine / day
11.2h
Mean relative humidity
78%
Average peak wind
14.9km/h
Seasonal range
8.1°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
35 d/yr
Annual snowfall
0.0 cm
Average feels-like high
20.2 °C
Average feels-like low
14.1 °C
Average peak gust
28.5 km/h
Tropical nights (≥ 20 °C)
22 d/yr
Solar radiation
20.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.36 · 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
37.3 °C
4 September 1988
Coldest day
2.7 °C
4 January 1949
Wettest day
75 mm
20 December 2010
Windiest day
49.0 km/h
30 November 1982
Strongest gust
91.8 km/h
20 January 2017
Hottest feels-like
40.0 °C
5 September 1984
Coldest feels-like
-2.6 °C
4 January 1949
Snowiest day
0.8 cm
25 January 1949
Sunniest day
14.0 h
19 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 | 17.2 °C | +0.7 °C | 9 mm | -52 mm |
| Feb | 17.3 °C | +0.9 °C | 52 mm | -11 mm |
| Mar | 15.7 °C | -0.9 °C | 63 mm | +16 mm |
| Apr | 16.7 °C | -0.9 °C | 10 mm | -11 mm |
| May | 19.1 °C | +0.5 °C | 9 mm | +2 mm |
| Jun | 20.9 °C | +0.4 °C | 1 mm | -1 mm |
| Jul | 21.8 °C | -1.4 °C | 1 mm | +0 mm |
| Aug | 24.2 °C | +0.1 °C | 1 mm | -1 mm |
| Sep | 24.1 °C | +0.3 °C | 9 mm | +4 mm |
| Oct | 21.7 °C | -0.3 °C | 23 mm | +11 mm |
| Nov | 20.0 °C | +0.5 °C | 109 mm | +80 mm |
| Dec | 19.4 °C | +2.4 °C | 49 mm | +5 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 Oceanside?
Oceanside has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 16.9 °C and it receives 294 mm of precipitation per year.
What is the hottest day ever recorded in Oceanside?
The hottest day measured in Oceanside between 1940 and 2025 was 4 September 1988, reaching 37.3 °C.
What is the coldest day in Oceanside?
The coldest day measured in Oceanside between 1940 and 2025 was 4 January 1949, at 2.7 °C.
Does it snow in Oceanside?
Almost never: Oceanside sees virtually no snow, with about 0 frost days per year.
Has the climate of Oceanside warmed?
Yes: Oceanside warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Oceanside?
The wettest day measured in Oceanside between 1940 and 2025 was 20 December 2010, with 75 mm of rain in 24 hours.
What was the windiest day in Oceanside?
The windiest day measured in Oceanside between 1940 and 2025 was 30 November 1982, with winds reaching 49.0 km/h.
What is the warmest month in Oceanside?
The warmest month in Oceanside is August (21.3 °C on average); the coldest is January (13.2 °C).
How much does it rain in Oceanside?
Oceanside receives on average 294 mm of precipitation per year, spread over about 35 rainy days.
Is it sunny in Oceanside?
Oceanside 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 Oceanside?
The heaviest 24-hour snowfall measured in Oceanside between 1940 and 2025 was 25 January 1949, with 0.8 cm.
Are there tropical nights in Oceanside?
Yes: Oceanside has on average 22 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Oceanside?
In Oceanside, between 1940 and 2025, the highest apparent temperature reached 40.0 °C on 5 September 1984, and the lowest was -2.6 °C on 4 January 1949.
Compare Oceanside with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Oceanside