September Weather in California

Last updated: March 2, 2024

The weather in California, United States, during September is characterized by an average temperature of 22°C (73°F). Highs can soar to 34°C (93°F), while lows may dip to 9°C (49°F). Typically, the humidity level in California throughout September hovers around 72%.

9°C (49°F)

Minimum temperature

22°C (73°F)

Average temperature

34°C (93°F)

Maximum temperature

72%

Humidity

Precipitation and Sunshine hours

In September, California averages 61 mm (2.4 inches) of rainfall, typically over the course of 6 rainy days. The month enjoys an average of 12 hours 22 minutes of daylight, with the sun shining for approximately 9 hours 25 minutes each day. Additionally, there is a 71% probability of sunny days during this period.

61 mm (2.4 inches)

Precipitation

6 rainy days

Rainy days

9 hours 25 minutes

Sunshine hours

71%

Chance of sun

UV Index

In September, the UV Index in California reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 1 1 2 4 6 8 9 8 6 4 2 1 1
Exposure Low Moderate High VeryHigh High Moderate Low
Time to burn 45 min 30 min 25 min 15 min 25 min 30 min 45 min

Compare California's Climate with Cities Worldwide