The highest day temperature in June 2026 was 98°F. The lowest night temperature was 51°F. The average values for day and night temperatures during June were 79.3°F и 56.3°F respectivly.

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

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

The average wind speed in June is 6.2 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 June is 12.8 hours.