Simi Valley, California Weather:
Monday, August 31, 2026
Sunny Weather
Day 84°
Night 55°
Precipitation 1 %
Wind 8 mph
UV Index (0 - 11+) 9
Weather Forecast History
Last Year's Weather on This Day (August 31, 2025)
Night

Day

93°

Night

64°

Wind

5 mph

Precipitation

0 %