September Weather in Oroville, United States

Last updated: June 24, 2025

In September, the average temperature in Oroville, United States hovers around 15°C (59°F). Expect a range where the minimum dips to a chilly 1°C (34°F) while the maximum can soar up to 31°C (88°F). During this month, you'll likely see about 40 mm (1.6 in) of precipitation over 7 days, with humidity levels averaging at a comfortable 74%. Stay prepared and enjoy the diverse weather!

September Temperature in Oroville

In September in Oroville, the average temperature is 15°C (59°F), with maximums reaching up to 31°C (88°F) and minimums dropping as low as 1°C (34°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack layers for both warm and cool conditions.

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

The chart illustrates September temperature patterns in Oroville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oroville, September typically has an average temperature of 15°C (59°F), with highs reaching up to 31°C (88°F) and lows dropping to around 1°C (34°F).

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

September Precipitation in Oroville

In Oroville in September, the precipitation amount is 40 mm (1.6 in) over a span of 7 days.

September Precipitation Trends in Oroville

The chart displays monthly precipitation patterns in Oroville, 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 Oroville, September typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 7 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Oroville

In Oroville in September, humidity is 74%. With an average temperature of 15°C (59°F), this humidity feels like traveling through a warm, sticky blanket that clings to your skin, making outdoor activities a bit uncomfortable and prompting you to seek out shaded areas or cool breezes.

September Average Humidity in Oroville

This chart illustrates the average monthly humidity levels in Oroville, 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 Oroville is approximately 74%, 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 Oroville

In Oroville in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Oroville.

Maximum UV Index Levels in Oroville for September

The chart shows the monthly maximum UV Index (UVI) for Oroville 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 Oroville typically reaches 7, which falls under the high exposure category.

Data source: Oroville 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 Oroville Compares to Other Months

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

This table compares monthly weather conditions in Oroville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	87 mm (3.4 inches)	90%	low
February Weather	-3°C (27°F)	73 mm (2.9 inches)	91%	moderate
March Weather	3°C (37°F)	81 mm (3.2 inches)	89%	moderate
April Weather	7°C (45°F)	65 mm (2.5 inches)	85%	high
May Weather	13°C (55°F)	42 mm (1.6 inches)	82%	very high
June Weather	17°C (63°F)	31 mm (1.2 inches)	81%	very high
July Weather	21°C (70°F)	8 mm (0.3 inches)	84%	very high
August Weather	20°C (69°F)	12 mm (0.5 inches)	75%	very high
September Weather	15°C (59°F)	40 mm (1.6 inches)	74%	high
October Weather	7°C (44°F)	68 mm (2.7 inches)	85%	moderate
November Weather	2°C (35°F)	92 mm (3.6 inches)	88%	moderate
December Weather	-2°C (29°F)	98 mm (3.9 inches)	93%	low