September Rainfall and Precipitation in The Napa Valley
Average rainfall, rainy days and the driest cities in the Napa Valley, the United States of America in September.
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Best Places to Visit in the Napa Valley in September
Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across the Napa Valley.
Monthly precipitation
0 mm (0 in) dry → 150 mm (5.9 in) wet
Marker color shows total monthly precipitation in September: pale blue is dry, deep blue is wet.
The Napa Valley precipitation in September: frequently asked questions
How much rainfall does the Napa Valley, the United States of America receive in September?
Napa stays mostly dry in September, with average rainfall close to 3.8 mm (0.1 in).
How many days does it rain in the Napa Valley, the United States of America in September?
On average, Napa has about a single day days of rain in September.
Is September part of the rainy season in the Napa Valley, the United States of America?
Not really. September is outside the wettest stretch of the year in the Napa Valley, the United States of America.
Interested in more climate information?
We have much more information about the climate in the Napa Valley.
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