Napa, California Weather:
Friday, September 18, 2026
Cloudy Weather
Day 88°
Night 57°
Precipitation 56 %
Wind 6 mph
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Cloudy Weather

Day

75°

Night

59°

Wind

9 mph

UV Index

60

Precipitation

4 %