Petaluma (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Petaluma.
Climate overview of Petaluma
Petaluma, California, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 28°C (82°F) in July, while winters cool to 14°C (57°F) in December.
Petaluma sees a moderate amount of rainfall, totalling around 614 mm (24 in) per year. It experiences a distinct dry season from May to October, with warm summers and mild winters, creating some seasonal variation. The sunniest month is May, with 10.3 hours of sunshine per day on average.
Petaluma Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Petaluma - and find the best time to visit.
Monthly Temperature in Petaluma
Depending on the time of the year, temperatures range from comfortable to moderate in Petaluma. Average maximum daytime temperatures range from a comfortable 28°C (82°F) in July, the warmest time of the year, to a moderate 14°C (57°F) during cooler months like December.
At night, you can expect temperatures ranging from 11°C (52°F) in July to around 3°C (37°F) during December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Petaluma
Generally, Petaluma has a moderate amount of precipitation, averaging 614 mm (24 in) of rainfall annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, December it receives high rainfall, averaging 135 mm (5.3 in) of precipitation, recorded across 12 rainy days. In contrast, the driest month August brings less rainfall, with 0.1 mm (0 in) over 0 rainy days. For more details, please visit our Petaluma Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Petaluma
Seasonal changes in sunshine hours are quite dramatic in Petaluma. While May receives considerable daily sunshine with up to 10.3 hours, December marks the darkest time of the year, where sunshine is scarce with only 5.3 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Best Time to Visit Petaluma
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April, May, June, July, August, September and October
- Warmest weather: July, August and September
- Most sunshine: April, May, June and July
- Fewest rainy days: June, July, August and September
- Wettest months: January, February, March, November and December, when rainfall is highest.
- Seasonal pattern: A distinct dry season from May to October, with warm summers and mild winters
Frequently asked questions about the climate in Petaluma
What is the best time to visit Petaluma?
April, May, June, July, August, September and October typically offer the most optimal weather in Petaluma. In contrast, January, February and December tend to have less optimal conditions. Petaluma has a distinct dry season from May to October, with warm summers and mild winters.
What temperatures can I expect in Petaluma?
Daytime highs range from 14°C (57°F) in December to 28°C (82°F) in July. Nighttime lows range from 3°C (37°F) to 11°C (52°F). Temperatures vary considerably through the year.
How much rain does Petaluma get?
Annual rainfall is around 614 mm (24 in). December is the wettest month with 135 mm (5.3 in), while August is the driest with 0.1 mm (0 in).
How sunny is Petaluma?
Petaluma receives around 3,042 hours of sunshine per year. May is the sunniest month with 310 hours, while December is the cloudiest with just 160 hours. Overall, Petaluma enjoys abundant sunshine.
Petaluma 3-Day Forecast
Petaluma on the map
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