Walnut Creek Climate by Month
Walnut Creek, California, United States
Warm summers and cool winters, with most rain from December to March.
The climate in Walnut Creek is one of warm summers and cool winters, with most rain from December to March. Expect highs of 84°F (29°C) in August and 57°F (14°C) in January, with the coldest nights (December) near 41°F (5°C). Of the 19 in (485 mm) of rain in a typical year, 72% falls from December to March. June to September are almost completely dry.
- Warmest month
- 84°F(29°C)
- Average high, August
- Coldest nights
- 41°F(5°C)
- Average low, December
- Rain per year
- 19 in(485 mm)
- Wettest: January
- Humidity
- 64%
- Sunniest: June
Best and worst months in Walnut Creek
Best for weatherMay and October are the best time for weather in Walnut Creek: highs near 76°F (24°C) and about 0.8 in (20 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)
Walnut Creek weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 57°F(14°C) | 41°F(5°C) | 4.0 in(102 mm) | 77% | 1.8 |
| FebFebruary | 61°F(16°C) | 43°F(6°C) | 3.7 in(95 mm) | 75% | 2.7 |
| MarMarch | 66°F(19°C) | 46°F(8°C) | 2.6 in(65 mm) | 66% | 4.2 |
| AprApril | 70°F(21°C) | 47°F(9°C) | 1.3 in(34 mm) | 65% | 5.5 |
| MayMayBest | 75°F(24°C) | 51°F(11°C) | 0.6 in(15 mm) | 61% | 6.4 |
| JunJune | 81°F(27°C) | 55°F(13°C) | 0.2 in(4 mm) | 56% | 7.4 |
| JulJuly | 84°F(29°C) | 57°F(14°C) | 0.0 in(1 mm) | 56% | 7.4 |
| AugAugust | 84°F(29°C) | 57°F(14°C) | 0.0 in(1 mm) | 55% | 6.6 |
| SepSeptember | 83°F(29°C) | 55°F(13°C) | 0.1 in(2 mm) | 57% | 5.5 |
| OctOctoberBest | 77°F(25°C) | 51°F(11°C) | 1.0 in(25 mm) | 54% | 3.9 |
| NovNovember | 65°F(19°C) | 45°F(7°C) | 2.0 in(52 mm) | 67% | 2.6 |
| DecDecember | 57°F(14°C) | 41°F(5°C) | 3.5 in(89 mm) | 76% | 1.7 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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