Simi Valley, California Weather:
Monday, September 21, 2026
Cloudy Weather
Day 82°
Night 59°
Precipitation 2 %
Wind 6 mph
UV Index (0 - 11+) 6
Weather Forecast History
Last Year's Weather on This Day (September 21, 2025)
Cloudy Night

Day

82°

Night

61°

Wind

5 mph

Precipitation

1 %