Eureka Climate by Month
Eureka, California, United States
Mild all year, with most rain from November to March.
The climate in Eureka is mild all year, with most rain from November to March. August is the warmest month, with highs around 68°F (20°C); January is the coolest at 56°F (13°C), and nights dip to 41°F (5°C). It gets 39 in (986 mm) of rain a year, 76% of it from November to March. July and August are almost completely dry.
- Warmest month
- 68°F(20°C)
- Average high, August
- Coldest nights
- 41°F(5°C)
- Average low, December
- Rain per year
- 39 in(986 mm)
- Wettest: December
- Humidity
- 77%
- Sunniest: July
Best and worst months in Eureka
Best for weatherJuly to September are the best time for weather in Eureka: highs near 68°F (20°C) and almost no rain.
Least pleasantDecember is the least pleasant month: it's the coldest, with highs of only 56°F (13°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in August.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Eureka weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 56°F(13°C) | 41°F(5°C) | 6.0 in(152 mm) | 78% | 1.6 |
| FebFebruary | 56°F(14°C) | 42°F(6°C) | 5.4 in(137 mm) | 76% | 2.4 |
| MarMarch | 58°F(14°C) | 43°F(6°C) | 5.4 in(136 mm) | 81% | 3.6 |
| AprApril | 60°F(16°C) | 44°F(7°C) | 3.1 in(80 mm) | 75% | 4.6 |
| MayMay | 62°F(17°C) | 47°F(9°C) | 1.7 in(42 mm) | 75% | 5.7 |
| JunJune | 65°F(18°C) | 51°F(10°C) | 0.7 in(18 mm) | 74% | 6.4 |
| JulJulyBest | 67°F(20°C) | 52°F(11°C) | 0.2 in(4 mm) | 81% | 6.5 |
| AugAugustBest | 68°F(20°C) | 53°F(12°C) | 0.3 in(7 mm) | 78% | 5.7 |
| SepSeptemberBest | 68°F(20°C) | 51°F(11°C) | 0.7 in(18 mm) | 75% | 4.7 |
| OctOctober | 65°F(18°C) | 47°F(8°C) | 2.6 in(67 mm) | 79% | 3.2 |
| NovNovember | 59°F(15°C) | 43°F(6°C) | 5.2 in(132 mm) | 77% | 2.0 |
| DecDecember | 56°F(13°C) | 41°F(5°C) | 7.6 in(193 mm) | 78% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate
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