Seaside climate — normals and trends
Seaside (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 12.4 °C and it receives 503 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 July (16.1 °C on average) and the coldest is January (8.9 °C). Rainfall peaks in January.
Seaside averages 1 frost days, 1 hot days (≥ 30 °C) and 54 rainy days per year.
Seaside has warmed by +0.8 °C between 1940 and 2025, or +0.10 °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 34.5 °C (on 9 September 1944) and the coldest -4.6 °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
SeasideCalifornia
- coords
- 36.61°, -121.85°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.4°C
Average daily high
17.0°C
Average daily low
8.6°C
Annual rainfall
503mm
Sunshine / day
11.0h
Mean relative humidity
75%
Average peak wind
13.9km/h
Seasonal range
7.2°C
Frost days (< 0 °C)
1 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
54 d/yr
Annual snowfall
1.8 cm
Average feels-like high
16.2 °C
Average feels-like low
6.7 °C
Average peak gust
35.1 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
19.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.8 °C
since 1940
+0.1 °C per decade · r² = 0.20 · 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
34.5 °C
9 September 1944
Coldest day
-4.6 °C
22 December 1990
Wettest day
92 mm
11 December 2014
Windiest day
46.3 km/h
24 December 2025
Strongest gust
137.9 km/h
14 February 1986
Hottest feels-like
35.3 °C
2 September 2017
Coldest feels-like
-9.3 °C
22 December 1990
Snowiest day
6.4 cm
2 March 1976
Sunniest day
14.1 h
26 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 | 14.5 °C | +1.6 °C | 8 mm | -87 mm |
| Feb | 14.4 °C | +0.9 °C | 108 mm | +14 mm |
| Mar | 13.9 °C | -0.1 °C | 101 mm | +15 mm |
| Apr | 15.0 °C | -0.1 °C | 21 mm | -20 mm |
| May | 16.9 °C | +0.2 °C | 3 mm | -11 mm |
| Jun | 18.0 °C | -1.1 °C | 0 mm | -3 mm |
| Jul | 18.9 °C | -2.5 °C | 0 mm | -0 mm |
| Aug | 20.9 °C | -0.6 °C | 2 mm | +0 mm |
| Sep | 21.1 °C | -0.3 °C | 6 mm | +2 mm |
| Oct | 18.5 °C | -0.9 °C | 32 mm | +10 mm |
| Nov | 16.4 °C | +0.5 °C | 94 mm | +38 mm |
| Dec | 14.9 °C | +1.6 °C | 69 mm | -17 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 Seaside?
Seaside has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 12.4 °C and it receives 503 mm of precipitation per year.
What is the hottest day ever recorded in Seaside?
The hottest day measured in Seaside between 1940 and 2025 was 9 September 1944, reaching 34.5 °C.
What is the coldest day in Seaside?
The coldest day measured in Seaside between 1940 and 2025 was 22 December 1990, at -4.6 °C.
Does it snow in Seaside?
Yes. Seaside gets on average 1.8 cm of snow per year and has around 1 frost days.
Has the climate of Seaside warmed?
Yes: Seaside warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Seaside?
The wettest day measured in Seaside between 1940 and 2025 was 11 December 2014, with 92 mm of rain in 24 hours.
What was the windiest day in Seaside?
The windiest day measured in Seaside between 1940 and 2025 was 24 December 2025, with winds reaching 46.3 km/h.
What is the warmest month in Seaside?
The warmest month in Seaside is July (16.1 °C on average); the coldest is January (8.9 °C).
How much does it rain in Seaside?
Seaside receives on average 503 mm of precipitation per year, spread over about 54 rainy days.
Is it sunny in Seaside?
Seaside gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
What is the biggest single-day snowfall in Seaside?
The heaviest 24-hour snowfall measured in Seaside between 1940 and 2025 was 2 March 1976, with 6.4 cm.
Are there tropical nights in Seaside?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Seaside.
What was the most extreme apparent temperature in Seaside?
In Seaside, between 1940 and 2025, the highest apparent temperature reached 35.3 °C on 2 September 2017, and the lowest was -9.3 °C on 22 December 1990.
Compare Seaside with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Seaside