September Weather in Willow Creek, United States

Last updated: June 24, 2025

The average temperature in Willow Creek, United States during September is 16°C (61°F). However, be prepared for temperature fluctuations, as it can drop to a chilly 2°C (37°F) or rise to a scorching 37°C (98°F). This month also sees precipitation of around 34 mm (1.3 in) over approximately 3 days, with an average humidity level of 62%.

September Temperature in Willow Creek

In September in Willow Creek, the average temperature is 16°C (61°F). The maximum can reach 37°C (98°F), while the minimum can drop as low as 2°C (37°F). Be prepared for a wide range of temperatures when traveling during this month.

September Weather in Willow Creek: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Willow Creek, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Willow Creek, September typically has an average temperature of 16°C (61°F), with highs reaching up to 37°C (98°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec414144485360656561544640
Data source: Temperature data for Willow Creek 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 Willow Creek

In Willow Creek in September, the precipitation amount is 34 mm (1.3 in) over the course of 3 days.

September Precipitation Trends in Willow Creek

The chart displays monthly precipitation patterns in Willow Creek, 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 Willow Creek, September typically receives around 34 mm (1.3 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec2432281871216824213470160182
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Willow Creek

In Willow Creek in September, humidity is 62%. With an average temperature of 16°C (61°F), this humidity feels like a gentle blanket, making traveling comfortable yet occasionally sticky, prompting the need for light, breathable clothing to fully enjoy the sights.

September Average Humidity in Willow Creek

This chart illustrates the average monthly humidity levels in Willow Creek, 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 Willow Creek is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Willow Creek

In Willow Creek 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 Willow Creek.

Maximum UV Index Levels in Willow Creek for September

The chart shows the monthly maximum UV Index (UVI) for Willow Creek 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 Willow Creek typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3478111110109642
Data source: Willow Creek 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 Willow Creek Compares to Other Months

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

This table compares monthly weather conditions in Willow Creek, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)243 mm (9.5 inches)86%moderate
February Weather5°C (42°F)228 mm (9.0 inches)85%moderate
March Weather7°C (44°F)187 mm (7.4 inches)85%high
April Weather9°C (49°F)121 mm (4.8 inches)82%very high
May Weather12°C (54°F)68 mm (2.7 inches)81%extreme
June Weather15°C (60°F)24 mm (1.0 inches)79%extreme
July Weather18°C (65°F)2 mm (0.1 inches)70%very high
August Weather19°C (66°F)1 mm (0.0 inches)60%very high
September Weather16°C (61°F)34 mm (1.3 inches)62%very high
October Weather12°C (54°F)69 mm (2.7 inches)72%high
November Weather8°C (46°F)160 mm (6.3 inches)87%moderate
December Weather5°C (40°F)182 mm (7.2 inches)86%low

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