Simi Valley climate

Typical historical weather for Simi Valley, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.

Want today's actual conditions instead? See the current forecast for Simi Valley.

Annual average

17.3°C

across all months

Warmest month

29.4°C

Aug average high

Coolest month

7.5°C

Jan average low

Annual rainfall

439mm

total per year

Monthly averages

Average daily high/low temperature (band) and monthly rainfall (bars).

● Avg high● Avg low▮ Rainfall

Records on file

Hottest day

43.3°C

6 September 2020

Coldest day

1.1°C

15 December 2021

Wettest day

89.3mm

24 December 2025

Windiest day

6.2m/s

19 January 2021