September Weather in Colusa, United States

Last updated: June 24, 2025

In Colusa, United States, the average temperature for September hovers around 26°C (79°F). Temperatures can vary widely, with a minimum of 7°C (44°F) and soaring up to 46°C (115°F). Expect very low precipitation during this time—only about 1 mm (0.0 in) across 0 days. The average humidity sits at a comfortable 44%, making it an ideal time to enjoy the outdoors!

September Temperature in Colusa

In September in Colusa, the average temperature is 26°C (79°F). The maximum can reach up to 46°C (115°F), while the minimum can drop as low as 7°C (44°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates September temperature patterns in Colusa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Colusa, September typically has an average temperature of 26°C (79°F), with highs reaching up to 46°C (115°F) and lows dropping to around 7°C (44°F).

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

September Precipitation in Colusa

In Colusa in September, the precipitation amount is 1 mm (0.0 in) during a span of 0 days.

September Precipitation Trends in Colusa

The chart displays monthly precipitation patterns in Colusa, 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 Colusa, September typically receives around 1 mm (0.0 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 Colusa

In Colusa in September, humidity is 44%. With an average temperature of 26°C (79°F), this humidity feels like a warm embrace—pleasant for strolling outdoors, yet with just enough moisture in the air to keep travelers refreshed during their adventures.

September Average Humidity in Colusa

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

In Colusa 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 Colusa.

Maximum UV Index Levels in Colusa for September

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

Data source: Colusa 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 Colusa Compares to Other Months

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

This table compares monthly weather conditions in Colusa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	11°C (51°F)	95 mm (3.8 inches)	84%	moderate
February Weather	13°C (55°F)	91 mm (3.6 inches)	84%	moderate
March Weather	14°C (58°F)	71 mm (2.8 inches)	83%	high
April Weather	19°C (66°F)	27 mm (1.1 inches)	81%	very high
May Weather	23°C (74°F)	23 mm (0.9 inches)	74%	very high
June Weather	28°C (83°F)	3 mm (0.1 inches)	64%	extreme
July Weather	30°C (87°F)	0 mm (0.0 inches)	44%	very high
August Weather	29°C (85°F)	0 mm (0.0 inches)	36%	very high
September Weather	26°C (79°F)	1 mm (0.0 inches)	44%	very high
October Weather	20°C (69°F)	25 mm (1.0 inches)	65%	high
November Weather	14°C (58°F)	38 mm (1.5 inches)	84%	moderate
December Weather	10°C (51°F)	73 mm (2.9 inches)	83%	moderate