Simi Valley
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Simi Valley, CA

An aerial shot of the deep design and plan of the Simi Valley city in California, with a view of the scenic Rocky Peak and hilly ranges and a clear sky
An aerial shot of the deep design and plan of the Simi Valley city in California, with a view of the scenic Rocky Peak and hilly ranges and a clear sky
The first month of the autumn, September, is still a tropical month in Simi Valley, California, with average temperature fluctuating between 93°F (33.9°C) and 55°F (12.8°C).

Temperature

In Simi Valley, the average high-temperature in September is relatively the same as in August - a hot 93°F (33.9°C). In September, in Simi Valley, the average low-temperature is 55°F (12.8°C).

Rainfall

Throughout September, in Simi Valley, 0.1" (3.6mm) of precipitation is accumulated. Throughout the year, 17.9" (455.4mm) of rain is accumulated.

Daylight

The average length of the day in September in Simi Valley is 12.4h.

What is the temperature in September in Simi Valley?

In Simi Valley, California, in September, the average high-temperature is 93°F (33.9°C), and the average low-temperature is 55°F (12.8°C).

How much does it rain in Simi Valley in September?

In Simi Valley, California, in September, 0.1" (3.6mm) of precipitation is typically accumulated.

How many hours of daylight does Simi Valley have in September?

In September, the average length of the day is 12.4h.
Average temperature in September - Simi Valley, CA
  • Average high temperature in September: 93°F

The warmest month (with the highest average high temperature) is August (97°F).
The month with the lowest average high temperature is December (68°F).

  • Average low temperature in September: 55°F

Months with the highest average low temperature are July and August (57°F).
The coldest month (with the lowest average low temperature) is December (38°F).

Average rainfall in September - Simi Valley, CA
  • Average rainfall in September: 0.1"

The wettest month (with the highest rainfall) is February (4.8").
The driest month (with the lowest rainfall) is July (0").

Average daylight in September - Simi Valley, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 9.9h).