Clearlake
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Clearlake, CA

A scenic view of the reflection and a long footbridge over the marina in Clearlake, California
A scenic view of the reflection and a long footbridge over the marina in Clearlake, California
The first month of the autumn, September, is also a moderately hot month in Clearlake, California, with average temperature varying between 48.9°F (9.4°C) and 84.9°F (29.4°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a moderately hot 84.9°F (29.4°C). In September, the average low-temperature is 48.9°F (9.4°C).

Rainfall

In Clearlake, 0.4" (10.9mm) of precipitation is typically accumulated. Throughout the year, in Clearlake, 31.4" (798mm) of rain is accumulated.

Daylight

In Clearlake, the average length of the day in September is 12.4h.

What is the temperature in September in Clearlake?

In September, in Clearlake, California, the average high-temperature is 84.9°F (29.4°C), and the average low-temperature is 48.9°F (9.4°C).

How much does it rain in Clearlake in September?

During September, Clearlake regularly aggregates up to 0.4" (10.9mm) of precipitation.

What is the average length of the day in September in Clearlake?

The average length of the day in September is 12.4h.
Average temperature in September - Clearlake, CA
  • Average high temperature in September: 85°F

The warmest month (with the highest average high temperature) is July (92°F).
Months with the lowest average high temperature are January and December (55°F).

  • Average low temperature in September: 49°F

The month with the highest average low temperature is July (55°F).
Coldest months (with the lowest average low temperature) are January and December (32°F).

Average rainfall in September - Clearlake, CA
  • Average rainfall in September: 0.4"

The wettest month (with the highest rainfall) is January (6.5").
The driest month (with the lowest rainfall) is July (0").

Average daylight in September - Clearlake, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.5h).