Costa Mesa
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Costa Mesa, CA

September, the first month of the autumn, in Costa Mesa, is still a warm month, with temperature in the range of an average high of 84°F (28.9°C) and an average low of 62.1°F (16.7°C).

Temperature

In Costa Mesa, the average high-temperature in September is relatively the same as in August - a still warm 84°F (28.9°C). The average low-temperature, in Costa Mesa, is 62.1°F (16.7°C).

Rainfall

During September, Costa Mesa regularly aggregates up to 0.2" (4.3mm) of precipitation. Throughout the year, 10.7" (272.1mm) of rain is accumulated.

Daylight

The average length of the day in September in Costa Mesa is 12.4h.

What is the temperature in September in Costa Mesa?

In September, the average high-temperature is 84°F (28.9°C), and the average low-temperature is 62.1°F (16.7°C).

How much does it rain in Costa Mesa in September?

In Costa Mesa, California, in September, 0.2" (4.3mm) of precipitation is typically accumulated.

What is the average length of the day in September in Costa Mesa?

In September, the average length of the day is 12.4h.
Average temperature in September - Costa Mesa, CA
  • Average high temperature in September: 84°F

The warmest month (with the highest average high temperature) is August (85°F).
The month with the lowest average high temperature is December (69°F).

  • Average low temperature in September: 62°F

The month with the highest average low temperature is August (64°F).
Coldest months (with the lowest average low temperature) are January and December (47°F).

Average rainfall in September - Costa Mesa, CA
  • Average rainfall in September: 0.2"

The wettest month (with the highest rainfall) is February (2.7").
Driest months (with the lowest rainfall) are July and August (0").

Average daylight in September - Costa Mesa, 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: 10h).