September Weather in Clearlake

Last updated: March 2, 2024

The weather in Clearlake, United States, during September is characterized by an average temperature of 21°C (71°F). Highs can soar to 36°C (98°F), while lows may dip to 9°C (49°F). Typically, the humidity level in Clearlake throughout September hovers around 68%.

9°C (49°F)

Minimum temperature

21°C (71°F)

Average temperature

36°C (98°F)

Maximum temperature

68%

Humidity

Precipitation and Sunshine hours

In September, Clearlake averages 4 mm (0.1 inches) of rainfall, typically over the course of 1 rainy days. The month enjoys an average of 12 hours 23 minutes of daylight, with the sun shining for approximately 10 hours 29 minutes each day. Additionally, there is a 80% probability of sunny days during this period.

4 mm (0.1 inches)

Precipitation

1 rainy days

Rainy days

10 hours 29 minutes

Sunshine hours

80%

Chance of sun

UV Index

In September, the UV Index in Clearlake 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 7 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 Clearlake's Climate with Cities Worldwide