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Climate · United States

Napa

Hot and dry from June to September; mild and damp from December to March.

Typical weather, averaged over 30 years38.3°N0 m above the sea
  1. Jan62°17°41°5°Rain on about two days a week.
  2. Feb65°18°43°6°Rain on about two days a week.
  3. Mar68°20°44°7°Rain on about two days a week.
  4. Apr73°23°47°8°Rain on about one day a week.
  5. May81°27°52°11°Rain on about one day a week.
  6. Jun89°32°56°13°Rain on fewer than one day a week.
  7. Jul92°33°58°14°Rain on fewer than one day a week.
  8. Aug92°33°58°14°Rain on fewer than one day a week.
  9. Sep90°32°58°14°Rain on fewer than one day a week.
  10. Oct84°29°55°13°Rain on fewer than one day a week.
  11. Nov71°22°48°9°Rain on about one day a week.
  12. Dec62°17°42°6°Rain on about two days a week.
Each month: its typical high and low, and dots for wet days a week. Tap a month to open it.The best months

The hot season runs from June to September, with highs near 91°F and nights near 58°F. From December to March, highs are nearer 64°F. The rain comes from December to March, on about two days a week. June to October is the driest stretch, with rain on fewer than one day a week. Daylight runs from about 9½ hours in December to 15 hours in June.The hot season runs from June to September, with highs near 33°C and nights near 14°C. From December to March, highs are nearer 18°C. The rain comes from December to March, on about two days a week. June to October is the driest stretch, with rain on fewer than one day a week. Daylight runs from about 9½ hours in December to 15 hours in June.

Where Napa sits

America/Los Angeles
this place
typical high in Januarytypical high in Februarytypical high in Marchtypical high in Apriltypical high in Maytypical high in Junetypical high in Julytypical high in Augusttypical high in Septembertypical high in Octobertypical high in Novembertypical high in December 40°F4°C95°F35°C
Latitude
38.3°Nnorthern hemisphere
Above the sea
0 mlow-lying
Sunrise, mid-JanuarySunrise, mid-FebruarySunrise, mid-MarchSunrise, mid-AprilSunrise, mid-MaySunrise, mid-JuneSunrise, mid-JulySunrise, mid-AugustSunrise, mid-SeptemberSunrise, mid-OctoberSunrise, mid-NovemberSunrise, mid-December
7:25 AM7:01 AM7:22 AM6:35 AM5:59 AM5:45 AM5:57 AM6:23 AM6:50 AM7:17 AM6:50 AM7:19 AMsets 5:11 PMsets 5:46 PMsets 7:15 PMsets 7:44 PMsets 8:12 PMsets 8:34 PMsets 8:33 PMsets 8:05 PMsets 7:19 PMsets 6:33 PMsets 4:58 PMsets 4:50 PM
Nearest of ours
Marshall55 km west

The land around Napa, shaded by its typical high in January, the planning map's own layer.The land around Napa, shaded by its typical high in February, the planning map's own layer.The land around Napa, shaded by its typical high in March, the planning map's own layer.The land around Napa, shaded by its typical high in April, the planning map's own layer.The land around Napa, shaded by its typical high in May, the planning map's own layer.The land around Napa, shaded by its typical high in June, the planning map's own layer.The land around Napa, shaded by its typical high in July, the planning map's own layer.The land around Napa, shaded by its typical high in August, the planning map's own layer.The land around Napa, shaded by its typical high in September, the planning map's own layer.The land around Napa, shaded by its typical high in October, the planning map's own layer.The land around Napa, shaded by its typical high in November, the planning map's own layer.The land around Napa, shaded by its typical high in December, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Through the year

week by week

Temperature

Highs from 62°F in December and January to 92°F in July and August.Highs from 17°C in December and January to 33°C in July and August.

Chance of a wet day

Wettest in January (34% of days), driest in August (0%).

Cloud cover

Clearest in July (11% cover), cloudiest in January (59%).

Daylight

From 9h 32m in December to 14h 47m in June.

Week by week, lightly smoothed. Shading marks the seasons; the olive line, the best months. Hover or tap a week for its figures.

Month by month

°F°C
Napa, month by month: the typical high and low, wet days a week, cloud cover and daylight.
MonthTypical low to highWet days a weekCloudDaylight
JanuaryWetter
41°5°62°17°
2 days59%9h 49m
FebruaryWetter
43°6°65°18°
2 days55%10h 42m
MarchWetter
44°7°68°20°
2 days51%11h 53m
AprilAt its best
47°8°73°23°
1 day43%13h 10m
MayAt its best
52°11°81°27°
1 day35%14h 14m
JuneHot season
56°13°89°32°
no days23%14h 47m
JulyHot season
58°14°92°33°
no days11%14h 32m
AugustHot season
58°14°92°33°
no days12%13h 35m
SeptemberHot season
58°14°90°32°
no days15%12h 21m
OctoberAt its best
55°13°84°29°
no days26%11h 05m
NovemberAt its best
48°9°71°22°
1 day44%10h 03m
DecemberWetter
42°6°62°17°
2 days56%9h 32m

When is the best time to visit Napa?

The best months are April to May, or October to November: highs near 77°F, nights near 50°F, and rain on about one day a week.The best months are April to May, or October to November: highs near 25°C, nights near 10°C, and rain on about one day a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

Questions

What is the warmest month in Napa?

July and August, with highs near 92°F and lows near 58°F. The coolest are December and January, with highs near 62°F.July and August, with highs near 33°C and lows near 14°C. The coolest are December and January, with highs near 17°C.

When does it rain most in Napa?

January, with rain on about two days a week. August is the driest, with rain on fewer than one day a week.

How long are the days in Napa?

From about 9½ hours in December to 15 hours in June.

When are the skies clearest in Napa?

July, when cloud covers about 11% of the sky on average. January is the cloudiest, at about 59%.

Places with a year like Napa's

by their highs, lows and wet days

Their highs, lows, wet days and cloud run closest to Napa's through the year, one place a country. “Six months apart”: their winter is Napa's summer.

Elsewhere in United States

All of United States

Where to stay

2 in our collection
Open the planning map

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Napa. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (0 m) against the climate model's (136 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (0 m) against the climate model's (136 m). Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.