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Napa, CA Weather


Napa, CA climate is mild during summer when temperatures tend to be in the 60's and cold during winter when temperatures tend to be in the 40's.

The warmest month of the year is July with an average maximum temperature of 82.60 degrees Fahrenheit, while the coldest month of the year is December with an average minimum temperature of 38.60 degrees Fahrenheit.

Temperature variations between night and day tend to be moderate during summer with a difference that can reach 28 degrees Fahrenheit, and fairly limited during winter with an average difference of 19 degrees Fahrenheit.

The annual average precipitation at Napa is 26.46 Inches. Winter months tend to be wetter than summer months. The wettest month of the year is January with an average rainfall of 5.35 Inches.

Weather Data

Normal Climate

Normal Temperatures

(NAPA STATE HOSPITAL Weather station, 1.42 miles from Napa)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Max °F 56.6 61.8 65.4 70.5 75.4 80.5 82.6 82.4 81.8 76.4 64.1 56.8 71.2
Mean °F 47.9 51.8 54.3 57.6 62.1 66.6 68.6 68.5 67.5 62.7 53.5 47.7 59.1
Min °F 39.2 41.8 43.1 44.7 48.8 52.6 54.5 54.5 53.1 49.0 42.9 38.6 46.9

Normal Precipitation

(NAPA STATE HOSPITAL Weather station, 1.42 miles from Napa)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Inch 5.35 5.03 4.09 1.45 0.78 0.16 0.05 0.11 0.41 1.43 3.72 3.88 26.46