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Climate · Napa

Napa in May

Warm and dry, as the days lengthen.

Typical weather, averaged over 30 years

May in Napa is warm: highs near 81°F, lows near 52°F. Rain falls on about one day a week, and the days lengthen by 47 minutes from the first week to the last.May in Napa is warm: highs near 27°C, lows near 11°C. Rain falls on about one day a week, and the days lengthen by 47 minutes from the first week to the last.

High
81°F27°Caverage
Low
52°F11°Caverage
Wet days
1a week · 11% of days
Daylight
14h 14mon average

Is May a good time to visit Napa?

Yes. May is one of Napa's best months (April to May, or October to November).

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.

How May sits in the year

week by week

Temperature

Highs near 81°F in May, against 62°F to 92°F through the year.Highs near 27°C in May, against 17°C to 33°C through the year.

Chance of a wet day

11% of days in May, against 0% to 34% through the year.

Cloud cover

35% cover in May, against 11% to 59% through the year.

Daylight

14h 14m in May, against 9h 32m to 14h 47m through the year.

Week by week, lightly smoothed, with May shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. April73°23°low 47°low 8°1 wet day a weekRain on about one day a week.
  2. May81°27°low 52°low 11°1 wet day a weekRain on about one day a week.
  3. June89°32°low 56°low 13°no wet daysRain on fewer than one day a week.

Where Napa sits, in May

America/Los Angeles
this place
typical high in May 40°F4°C95°F35°C
Sunrise, mid-May
5:59 AMsets 8:12 PM
Above the sea
0 mlow-lying
Latitude
38.3°Nnorthern hemisphere
Nearest of ours
Marshall55 km west

The land around Napa, shaded by its typical high in May, 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.

Elsewhere in United States in May

high · low · wet days
See May on the planning mapThe whole year in Napa

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.