Napa Valley weather in July
Temperature, rain and sunshine in July: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in July
Excellent
Best time to visit: April – October
What is the weather like in Napa Valley in July?
In July, Napa Valley is hot: daytime highs average 28 °C, and nights cool down to about 13 °C. With around 12 hours of sunshine a day, there is plenty of sun. It hardly ever rains. On about 8 days the thermometer climbs to 30 °C or more. All in all, July is an excellent month for a holiday in Napa Valley.
July compared
How the weather changes from June to August. Tap a month to open it.
More details for July
- Daylight
- 14 h 36 min05:57 – 20:33
- UV index
- 10 · 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
- 19 %on averageAll months
- Hot days
- 8 days30 °C or moreAll months
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 50 %86 %
- 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 July
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- A jumper for the evenings
Napa Valley in July: quick answers
Is Napa Valley hot in July?
Yes. In July, Napa Valley is hot: daytime highs average 28 °C and nights stay around 13 °C. On about 8 days the thermometer climbs to 30 °C or more.
Does it rain much in Napa Valley in July?
It hardly ever rains.
Napa Valley month by month
The whole year in Napa ValleyAll destinations: USAWhere to go in July
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