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September Weather in Willits, United States

Last updated: June 24, 2025

In September, the average temperature in Willits, United States is a pleasant 19°C (66°F). Expect lows of around 3°C (37°F) and highs reaching up to 39°C (102°F). With an average humidity of 68%, you can anticipate a moderate feel throughout the month. Additionally, prepare for some light rain, as 11 mm (0.4 in) of precipitation is expected over 2 days.

September Temperature in Willits

In September in Willits, the average temperature is 19°C (66°F). Maximum can reach 39°C (102°F) and minimum can be as low as 3°C (37°F). Travelers should be prepared for a wide temperature range and pack accordingly for both warm and cool conditions.

September Weather in Willits: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Willits, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Willits, September typically has an average temperature of 19°C (66°F), with highs reaching up to 39°C (102°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec444546525766727266584943
Data source: Temperature data for Willits 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 Willits

In Willits in September, the precipitation amount is 11 mm (0.4 in) over the course of 2 days.

September Precipitation Trends in Willits

The chart displays monthly precipitation patterns in Willits, 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 Willits, September typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec19619314786595121161108132
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Willits

In Willits in September humidity is 68%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, creating a sticky atmosphere that can be a bit uncomfortable for traveling.

September Average Humidity in Willits

This chart illustrates the average monthly humidity levels in Willits, 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 Willits 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 Willits

In Willits 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 Willits.

Maximum UV Index Levels in Willits for September

The chart shows the monthly maximum UV Index (UVI) for Willits 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 Willits typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578111111119743
Data source: Willits 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 Willits Compares to Other Months

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

This table compares monthly weather conditions in Willits, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (44°F)195 mm (7.7 inches)86%moderate
February Weather7°C (45°F)193 mm (7.6 inches)84%moderate
March Weather8°C (47°F)147 mm (5.8 inches)83%high
April Weather11°C (52°F)86 mm (3.4 inches)80%very high
May Weather14°C (58°F)59 mm (2.3 inches)80%extreme
June Weather19°C (66°F)5 mm (0.2 inches)76%extreme
July Weather22°C (73°F)1 mm (0.0 inches)70%extreme
August Weather22°C (72°F)2 mm (0.1 inches)66%extreme
September Weather19°C (66°F)11 mm (0.4 inches)68%very high
October Weather15°C (58°F)61 mm (2.4 inches)72%high
November Weather10°C (50°F)108 mm (4.3 inches)84%moderate
December Weather6°C (44°F)132 mm (5.2 inches)84%moderate

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