Napa weather by month

Check out Napa weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in Napa (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
55°F maximum daytime temperature in January in Napa55
61°F maximum daytime temperature in February in Napa61
63°F maximum daytime temperature in March in Napa63
68°F maximum daytime temperature in April in Napa68
73°F maximum daytime temperature in May in Napa73
79°F maximum daytime temperature in June in Napa79
82°F maximum daytime temperature in July in Napa82
82°F maximum daytime temperature in August in Napa82
81°F maximum daytime temperature in September in Napa81
75°F maximum daytime temperature in October in Napa75
63°F maximum daytime temperature in November in Napa63
55°F maximum daytime temperature in December in Napa55
Min temperature (night-time)
37°F minimum night-time temperature in January in Napa37
41°F minimum night-time temperature in February in Napa41
41°F minimum night-time temperature in March in Napa41
43°F minimum night-time temperature in April in Napa43
46°F minimum night-time temperature in May in Napa46
52°F minimum night-time temperature in June in Napa52
54°F minimum night-time temperature in July in Napa54
54°F minimum night-time temperature in August in Napa54
52°F minimum night-time temperature in September in Napa52
48°F minimum night-time temperature in October in Napa48
43°F minimum night-time temperature in November in Napa43
37°F minimum night-time temperature in December in Napa37
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

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
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

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 (inches)
6.2 inches monthly rainfall in January in Napa6.2
4.5 inches monthly rainfall in February in Napa4.5
3.8 inches monthly rainfall in March in Napa3.8
1.9 inches monthly rainfall in April in Napa1.9
0.6 inches monthly rainfall in May in Napa0.6
0.2 inches monthly rainfall in June in Napa0.2
0.0 inches monthly rainfall in July in Napa0.0
0.1 inches monthly rainfall in August in Napa0.1
0.4 inches monthly rainfall in September in Napa0.4
1.6 inches monthly rainfall in October in Napa1.6
3.9 inches monthly rainfall in November in Napa3.9
5.0 inches monthly rainfall in December in Napa5.0

More about Napa

Napa by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for California (Napa) 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.

What's the climate like in Napa?

Napa has a temperate climate with hot dry summers.

Metric (°C)  |  Imperial (°F)

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More about California

Compare Napa with the UK

Below the Napa chart shows average maximum daytime temperature for Napa, California, USA and the UK (London).

Maximum daytime temperature (°F)

Napa, California, USA
UK (London)
55
45
61
45
63
50
68
55
73
63
79
68
82
72
82
72
81
66
75
59
63
50
55
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C)  |  Imperial (°F)

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