Petaluma Climate by Month
Petaluma, California, United States
Warm summers and cool winters, with most rain from December to March.
Warm summers and cool winters, with most rain from December to March: that's Petaluma's climate in short. August is the warmest month, with highs around 85°F (29°C); January is the coolest at 58°F (15°C), and nights dip to 39°F (4°C). Of the 31 in (779 mm) of rain in a typical year, 73% falls from December to March. June to September are almost completely dry.
- Warmest month
- 85°F(29°C)
- Average high, August
- Coldest nights
- 39°F(4°C)
- Average low, December
- Rain per year
- 31 in(779 mm)
- Wettest: February
- Humidity
- 68%
- Sunniest: June
Best and worst months in Petaluma
Best for weatherThe most comfortable weather comes in May, with highs around 74°F (23°C) and about 1.1 in (27 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 58°F (15°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)
Petaluma weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 58°F(15°C) | 40°F(4°C) | 6.0 in(152 mm) | 84% | 1.8 |
| FebFebruary | 63°F(17°C) | 42°F(5°C) | 6.2 in(158 mm) | 75% | 2.6 |
| MarMarch | 66°F(19°C) | 43°F(6°C) | 4.1 in(104 mm) | 69% | 4.1 |
| AprApril | 69°F(21°C) | 44°F(7°C) | 1.8 in(45 mm) | 70% | 5.4 |
| MayMayBest | 74°F(23°C) | 48°F(9°C) | 1.1 in(27 mm) | 66% | 6.3 |
| JunJune | 81°F(27°C) | 51°F(11°C) | 0.3 in(8 mm) | 59% | 7.3 |
| JulJuly | 84°F(29°C) | 52°F(11°C) | 0.0 in(1 mm) | 60% | 7.2 |
| AugAugust | 85°F(29°C) | 53°F(12°C) | 0.1 in(2 mm) | 58% | 6.5 |
| SepSeptember | 84°F(29°C) | 51°F(11°C) | 0.2 in(4 mm) | 60% | 5.4 |
| OctOctober | 79°F(26°C) | 47°F(9°C) | 1.6 in(40 mm) | 61% | 3.8 |
| NovNovember | 67°F(19°C) | 42°F(6°C) | 3.3 in(84 mm) | 76% | 2.5 |
| DecDecember | 59°F(15°C) | 39°F(4°C) | 6.1 in(154 mm) | 77% | 1.6 |
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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