Napa Valley weather in May
Temperature, rain and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Excellent
Best time to visit: April – October
What is the weather like in Napa Valley in May?
In May, Napa Valley is warm: daytime highs average 23 °C, and nights cool down to about 11 °C. With around 11 hours of sunshine a day, there is plenty of sun. Rain is rare: about 3 days bring 19 mm in total. All in all, May is an excellent month for a holiday in Napa Valley.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 14 h 13 min05:59 – 20:12
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 16 km/haverage daily peakAll months
- Cloud cover
- 35 %on averageAll months
- Hot days
- 3 days30 °C or moreAll months
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in May
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
Napa Valley in May: quick answers
Is Napa Valley hot in May?
Warm rather than hot: in May, daytime highs in Napa Valley average 23 °C and nights cool to about 11 °C. On about 3 days the thermometer climbs to 30 °C or more.
Does it rain much in Napa Valley in May?
Rain is rare: about 3 days bring 19 mm in total.
Napa Valley month by month
The whole year in Napa ValleyAll destinations: USAWhere to go in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences