Napa climate guide

Temperature in Napa (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
13°C maximum daytime temperature in January in Napa13
16°C maximum daytime temperature in February in Napa16
17°C maximum daytime temperature in March in Napa17
20°C maximum daytime temperature in April in Napa20
23°C maximum daytime temperature in May in Napa23
26°C maximum daytime temperature in June in Napa26
28°C maximum daytime temperature in July in Napa28
28°C maximum daytime temperature in August in Napa28
27°C maximum daytime temperature in September in Napa27
24°C maximum daytime temperature in October in Napa24
17°C maximum daytime temperature in November in Napa17
13°C maximum daytime temperature in December in Napa13
Min temperature (night-time)
3°C minimum night-time temperature in January in Napa3
5°C minimum night-time temperature in February in Napa5
5°C minimum night-time temperature in March in Napa5
6°C minimum night-time temperature in April in Napa6
8°C minimum night-time temperature in May in Napa8
11°C minimum night-time temperature in June in Napa11
12°C minimum night-time temperature in July in Napa12
12°C minimum night-time temperature in August in Napa12
11°C minimum night-time temperature in September in Napa11
9°C minimum night-time temperature in October in Napa9
6°C minimum night-time temperature in November in Napa6
3°C minimum night-time temperature in December in Napa3

Sunshine & Daylight in Napa

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
10 hours of daylight per day in January in Napa10
11 hours of daylight per day in February in Napa11
12 hours of daylight per day in March in Napa12
13 hours of daylight per day in April in Napa13
14 hours of daylight per day in May in Napa14
15 hours of daylight per day in June in Napa15
15 hours of daylight per day in July in Napa15
14 hours of daylight per day in August in Napa14
12 hours of daylight per day in September in Napa12
11 hours of daylight per day in October in Napa11
10 hours of daylight per day in November in Napa10
10 hours of daylight per day in December in Napa10

Rainfall in Napa

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
10 days with some rainfall in January in Napa10
9 days with some rainfall in February in Napa9
10 days with some rainfall in March in Napa10
6 days with some rainfall in April in Napa6
3 days with some rainfall in May in Napa3
1 day with some rainfall in June in Napa1
1 day with some rainfall in July in Napa1
1 day with some rainfall in August in Napa1
2 days with some rainfall in September in Napa2
4 days with some rainfall in October in Napa4
9 days with some rainfall in November in Napa9
10 days with some rainfall in December in Napa10
Average monthly rainfall (mm)
157 mm monthly rainfall in January in Napa157
115 mm monthly rainfall in February in Napa115
97 mm monthly rainfall in March in Napa97
47 mm monthly rainfall in April in Napa47
14 mm monthly rainfall in May in Napa14
5 mm monthly rainfall in June in Napa5
1 mm monthly rainfall in July in Napa1
3 mm monthly rainfall in August in Napa3
10 mm monthly rainfall in September in Napa10
41 mm monthly rainfall in October in Napa41
100 mm monthly rainfall in November in Napa100
127 mm monthly rainfall in December in Napa127

More climate for Napa

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 2 (Low) in January in Napa2
UV (maximum) index 3 (Moderate) in February in Napa3
UV (maximum) index 5 (Moderate) in March in Napa5
UV (maximum) index 7 (High) in April in Napa7
UV (maximum) index 8 (Very High) in May in Napa8
UV (maximum) index 9 (Very High) in June in Napa9
UV (maximum) index 9 (Very High) in July in Napa9
UV (maximum) index 9 (Very High) in August in Napa9
UV (maximum) index 7 (High) in September in Napa7
UV (maximum) index 5 (Moderate) in October in Napa5
UV (maximum) index 3 (Moderate) in November in Napa3
UV (maximum) index 2 (Low) in December in Napa2
Heat & Humidity
No heat & humidity in January in Napa0
No heat & humidity in February in Napa0
No heat & humidity in March in Napa0
No heat & humidity in April in Napa0
No heat & humidity in May in Napa0
Low heat & humidity in June in NapaL
Moderate heat & humidity in July in NapaM
Moderate heat & humidity in August in NapaM
Moderate heat & humidity in September in NapaM
No heat & humidity in October in Napa0
No heat & humidity in November in Napa0
No heat & humidity in December in Napa0

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

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The climate guide for Napa, California shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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Metric (°C / mm)  |  Imperial (°F / inches)

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