Napa, CA Weather & Climate Normals
Napa's real weather, in one number
Napa, CA scores 73/100 on this site's reading of NOAA's own 30-year normals: mild with real seasons. A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. 8 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Napa's hottest and coldest months
Napa's hottest month is Aug, averaging 70°F; its coldest is Dec, averaging 49°F, a 20.5°F swing across the year, a middling gap by national standards.
Napa's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 59°F | 40°F | 4.98in | 0in |
| Feb | 63°F | 42°F | 5.13in | 0in |
| Mar | 68°F | 44°F | 3.67in | 0in |
| Apr | 72°F | 46°F | 1.72in | 0in |
| May | 77°F | 50°F | 1.08in | 0in |
| Jun | 82°F | 54°F | 0.29in | 0in |
| Jul | 83°F | 56°F | 0in | 0in |
| Aug | 84°F | 56°F | 0.06in | 0in |
| Sep | 84°F | 53°F | 0.09in | 0in |
| Oct | 78°F | 49°F | 1.34in | 0in |
| Nov | 66°F | 44°F | 2.77in | 0in |
| Dec | 59°F | 40°F | 5.53in | 0in |
most of the year (8 of 12 months) are the best time to see Napa at its mildest; the rest of the year, plan around Dec's cold.
Rain and snow in Napa
Napa averages 26.66in of precipitation a year across roughly 68 days with measurable rain or snow, and 0in of snow a year.
Where Napa ranks
Napa ranks 222 of 4876 US cities in this dataset for comfort score, and 222 of 429 within CA. About 76,921 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Napa State Hospital, CA US, 2.4 miles from Napa, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure