September Weather in Willows, United States

Last updated: June 24, 2025

In September, the average temperature in Willows, United States is a pleasant 25°C (78°F). However, be prepared for temperature fluctuations; it can drop to a chilly 8°C (46°F) or soar to a sizzling 43°C (110°F). Rainfall is minimal, with only 2 mm (0.1 in) falling across 0 days, while average humidity hovers at a comfortable 44%.

September Temperature in Willows

In September in Willows, the average temperature is 25°C (78°F). Maximums can reach 43°C (110°F), while minimums can dip as low as 8°C (46°F). Be prepared for a wide range of temperatures during your travels.

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

The chart illustrates September temperature patterns in Willows, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Willows, September typically has an average temperature of 25°C (78°F), with highs reaching up to 43°C (110°F) and lows dropping to around 8°C (46°F).

Data source: Temperature data for Willows generated using information from the Copernicus Climate Change Service.

September Precipitation in Willows

In Willows in September, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

September Precipitation Trends in Willows

The chart displays monthly precipitation patterns in Willows, 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 Willows, September typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Willows

In Willows in September humidity is 44%. With an average temperature of 25°C (78°F), this humidity feels like a refreshing embrace, making it comfortable for traveling as you can enjoy outdoor activities without feeling overly sticky or drained.

September Average Humidity in Willows

This chart illustrates the average monthly humidity levels in Willows, 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 Willows is approximately 44%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Willows

In Willows 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 Willows.

Maximum UV Index Levels in Willows for September

The chart shows the monthly maximum UV Index (UVI) for Willows 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 Willows typically reaches 9, which falls under the very high exposure category.

Data source: Willows 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 Willows Compares to Other Months

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

This table compares monthly weather conditions in Willows, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	104 mm (4.1 inches)	84%	moderate
February Weather	12°C (53°F)	103 mm (4.0 inches)	84%	moderate
March Weather	13°C (56°F)	79 mm (3.1 inches)	83%	high
April Weather	18°C (64°F)	33 mm (1.3 inches)	81%	very high
May Weather	22°C (72°F)	24 mm (1.0 inches)	74%	extreme
June Weather	28°C (82°F)	5 mm (0.2 inches)	64%	extreme
July Weather	30°C (87°F)	0 mm (0.0 inches)	44%	extreme
August Weather	29°C (85°F)	0 mm (0.0 inches)	36%	very high
September Weather	25°C (78°F)	2 mm (0.1 inches)	44%	very high
October Weather	19°C (67°F)	27 mm (1.0 inches)	65%	high
November Weather	13°C (56°F)	40 mm (1.6 inches)	84%	moderate
December Weather	10°C (50°F)	72 mm (2.8 inches)	83%	moderate