Eureka, CA Weather & Climate Normals
What a normal year in Eureka actually looks like
On the 30-year record NOAA keeps for Eureka, CA, the comfort score comes out to 57/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 4 months a year land in the 55–75°F range this site treats as mild.
How much Eureka's weather actually swings
Average temperatures in Eureka run from 48°F in Dec up to 58°F in Aug, a 9.9°F seasonal swing, one of the smaller gaps in this dataset.
Eureka, month by month
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 56°F | 41°F | 7.52in |
| Feb | 57°F | 41°F | 6.48in |
| Mar | 57°F | 41°F | 6.28in |
| Apr | 58°F | 43°F | 4.11in |
| May | 60°F | 46°F | 2.1in |
| Jun | 63°F | 49°F | 0.96in |
| Jul | 63°F | 51°F | 0.19in |
| Aug | 65°F | 51°F | 0.26in |
| Sep | 65°F | 49°F | 0.85in |
| Oct | 64°F | 45°F | 2.71in |
| Nov | 59°F | 42°F | 5.71in |
| Dec | 56°F | 40°F | 8.95in |
If you're timing a visit, Jun, Jul, Aug, and Sep are Eureka's mildest stretch; if you're moving there, you should plan around Dec's cold instead.
How wet Eureka actually gets
Eureka averages 46.12in of precipitation a year across roughly 153 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Eureka against the rest of the country
Out of 4876 cities scored here, Eureka comes in at 673; within CA alone it ranks 339 of 429. Population is about 25,412.
Checking the actual forecast
These figures come from Arcata Eureka Ap, CA US, the NOAA station 12.7 miles from Eureka, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is