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September Weather in Clearlake Oaks, United States

Last updated: June 24, 2025

In Clearlake Oaks, United States, the average temperature in September hovers around 21°C (71°F), offering a pleasant climate. However, be prepared for fluctuations; temperatures can dip to a cool 6°C (42°F) or soar up to a scorching 40°C (105°F). Rainfall is minimal, with only 4 mm (0.1 in) expected over the course of just 1 day, while the air maintains an average humidity level of 68%.

September Temperature in Clearlake Oaks

In September in Clearlake Oaks, the average temperature is 21°C (71°F). Maximum temperatures can reach 40°C (105°F), while minimums can drop to as low as 6°C (42°F). It's essential to be prepared for a wide range of temperatures when traveling during this time.

September Weather in Clearlake Oaks: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Clearlake Oaks, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Clearlake Oaks, September typically has an average temperature of 21°C (71°F), with highs reaching up to 40°C (105°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec454749556171777771615246
Data source: Temperature data for Clearlake Oaks generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Clearlake Oaks

In Clearlake Oaks in September, the precipitation amount is 4 mm (0.1 in) over the course of 1 day.

September Precipitation Trends in Clearlake Oaks

The chart displays monthly precipitation patterns in Clearlake Oaks, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Clearlake Oaks, September typically receives around 4 mm (0.1 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec14415710450383014425794
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Clearlake Oaks

In Clearlake Oaks in September, humidity is 68%. With an average temperature of 21°C (71°F), this humidity feels like a warm embrace, making traveling a bit sticky but also inviting for leisurely strolls and outdoor adventures.

September Average Humidity in Clearlake Oaks

This chart illustrates the average monthly humidity levels in Clearlake Oaks, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Clearlake Oaks is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%83%80%80%76%70%66%68%72%84%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Clearlake Oaks

In Clearlake Oaks in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Clearlake Oaks.

Maximum UV Index Levels in Clearlake Oaks for September

The chart shows the monthly maximum UV Index (UVI) for Clearlake Oaks in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Clearlake Oaks typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111111119743
Data source: Clearlake Oaks September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Clearlake Oaks Compares to Other Months

Weather in Clearlake Oaks varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Clearlake Oaks, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Clearlake Oaks, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (46°F)144 mm (5.7 inches)86%moderate
February Weather8°C (48°F)157 mm (6.2 inches)84%moderate
March Weather9°C (49°F)104 mm (4.1 inches)83%high
April Weather13°C (56°F)50 mm (2.0 inches)80%very high
May Weather16°C (62°F)38 mm (1.5 inches)80%extreme
June Weather22°C (71°F)3 mm (0.1 inches)76%extreme
July Weather25°C (78°F)0 mm (0.0 inches)70%extreme
August Weather25°C (77°F)1 mm (0.0 inches)66%extreme
September Weather21°C (71°F)4 mm (0.1 inches)68%very high
October Weather16°C (62°F)42 mm (1.6 inches)72%high
November Weather11°C (52°F)57 mm (2.3 inches)84%moderate
December Weather8°C (46°F)94 mm (3.7 inches)84%moderate

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