The highest day temperature in July 2026 was 94°F. The lowest night temperature was 53°F. The average values for day and night temperatures during July were 80.9°F и 57.3°F respectivly.

Most of the days in July are sunny but you can also expect cloudy and gloomy days.

Precipitation total in July for Napa is 0.0 in. It makes july one of the least rainy months of the year.

The average wind speed in July is 5.7 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Napa in July is 12.7 hours.