Hercules Climate by Month
Hercules, California, United States
Warm summers and cool winters, with most rain from December to March.
Hercules has warm summers and cool winters, with most rain from December to March. August is the warmest month, with highs around 85°F (30°C); January is the coolest at 57°F (14°C), and nights dip to 40°F (5°C). Of the 26 in (672 mm) of rain in a typical year, 74% falls from December to March. June to September are almost completely dry.
- Warmest month
- 85°F(30°C)
- Average high, August
- Coldest nights
- 40°F(5°C)
- Average low, January
- Rain per year
- 26 in(672 mm)
- Wettest: January
- Humidity
- 65%
- Sunniest: June
Best and worst months in Hercules
Best for weatherMay is the best time for weather in Hercules: highs near 76°F (24°C) and about 0.9 in (22 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 57°F (14°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 May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Hercules weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 57°F(14°C) | 40°F(5°C) | 5.4 in(138 mm) | 85% | 1.8 |
| FebFebruary | 62°F(17°C) | 43°F(6°C) | 5.3 in(134 mm) | 74% | 2.6 |
| MarMarch | 66°F(19°C) | 45°F(7°C) | 3.5 in(90 mm) | 67% | 4.2 |
| AprApril | 71°F(21°C) | 47°F(8°C) | 1.6 in(40 mm) | 66% | 5.5 |
| MayMayBest | 76°F(24°C) | 51°F(10°C) | 0.9 in(22 mm) | 61% | 6.4 |
| JunJune | 82°F(28°C) | 54°F(12°C) | 0.2 in(6 mm) | 56% | 7.4 |
| JulJuly | 84°F(29°C) | 56°F(13°C) | 0.0 in(1 mm) | 56% | 7.3 |
| AugAugust | 85°F(30°C) | 56°F(14°C) | 0.0 in(1 mm) | 55% | 6.6 |
| SepSeptember | 83°F(29°C) | 54°F(12°C) | 0.1 in(3 mm) | 58% | 5.4 |
| OctOctober | 78°F(25°C) | 51°F(10°C) | 1.3 in(32 mm) | 59% | 3.8 |
| NovNovember | 66°F(19°C) | 44°F(7°C) | 2.8 in(72 mm) | 67% | 2.5 |
| DecDecember | 57°F(14°C) | 40°F(5°C) | 5.2 in(133 mm) | 77% | 1.7 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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