The highest day temperature in July 2024 was 103°F. The lowest night temperature was 54°F. The average values for day and night temperatures during July were 87.5°F и 59.9°F respectivly.

Almost all days in July are sunny. There is very low probability of clouds or 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 5.5 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 13.6 hours.