Petaluma, CA Weather & Climate Normals
What a normal year in Petaluma actually looks like
On the 30-year record NOAA keeps for Petaluma, CA, the comfort score comes out to 69/100, mild with real seasons: A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. Only 7 months a year land in the 55–75°F range this site treats as mild.
How much Petaluma's weather actually swings
Average temperatures in Petaluma run from 48°F in Dec up to 67°F in Aug, a 18.8°F seasonal swing, one of the smaller gaps in this dataset.
Petaluma, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 58°F | 39°F | 4.77in | 0in |
| Feb | 61°F | 40°F | 5.23in | 0in |
| Mar | 65°F | 42°F | 3.32in | 0in |
| Apr | 68°F | 44°F | 1.68in | 0in |
| May | 72°F | 47°F | 0.93in | 0in |
| Jun | 78°F | 50°F | 0.28in | 0in |
| Jul | 81°F | 52°F | 0.01in | 0in |
| Aug | 81°F | 53°F | 0.05in | 0in |
| Sep | 82°F | 51°F | 0.09in | 0in |
| Oct | 76°F | 48°F | 1.27in | 0in |
| Nov | 66°F | 42°F | 2.74in | 0in |
| Dec | 58°F | 38°F | 5.19in | 0in |
If you're timing a visit, most of the year (7 of 12 months) are Petaluma's mildest stretch; if you're moving there, you should plan around Dec's cold instead.
How wet Petaluma actually gets
Over a typical year, Petaluma sees about 25.56in of precipitation a year across roughly 70 days with measurable rain or snow, with 0in of snow a year.
Petaluma against the rest of the country
Out of 4876 cities scored here, Petaluma comes in at 249; within CA alone it ranks 242 of 429. Population is about 59,393.
Checking the actual forecast
These figures come from Petaluma Ap, CA US, the NOAA station 1.6 miles from Petaluma, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated