September Weather in Roseville, United States

Last updated: June 24, 2025

In September, the average temperature in Roseville, United States is a pleasant 18°C (64°F). However, temperatures can vary significantly, with minimums dipping to 2°C (36°F) and maximums soaring to 33°C (91°F). Expect 115 mm (4.5 in) of precipitation spread over 10 days, coupled with a higher average humidity of 81%, adding a touch of summer's embrace to your experience.

September Temperature in Roseville

In September in Roseville, the average temperature is 18°C (64°F). Maximums can reach 33°C (91°F), and minimums can be as low as 2°C (36°F). This makes Roseville a great destination for travelers looking to experience a range of temperatures, from warm days to cooler nights.

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

The chart illustrates September temperature patterns in Roseville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roseville, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (36°F).

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

September Precipitation in Roseville

In Roseville in September, the precipitation amount is 115 mm (4.5 in) over a span of 10 days.

September Precipitation Trends in Roseville

The chart displays monthly precipitation patterns in Roseville, 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 Roseville, September typically receives around 115 mm (4.5 inches) of precipitation spread over approximately 10 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 Roseville

In Roseville in September, humidity is 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.

September Average Humidity in Roseville

This chart illustrates the average monthly humidity levels in Roseville, 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 Roseville is approximately 81%, 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 Roseville

In Roseville 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 Roseville.

Maximum UV Index Levels in Roseville for September

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

Data source: Roseville 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 Roseville Compares to Other Months

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

This table compares monthly weather conditions in Roseville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (17°F)	27 mm (1.0 inches)	87%	low
February Weather	-8°C (17°F)	33 mm (1.3 inches)	90%	moderate
March Weather	0°C (33°F)	56 mm (2.2 inches)	85%	moderate
April Weather	6°C (43°F)	87 mm (3.4 inches)	84%	high
May Weather	15°C (59°F)	126 mm (5.0 inches)	78%	very high
June Weather	22°C (72°F)	86 mm (3.4 inches)	80%	very high
July Weather	24°C (75°F)	104 mm (4.1 inches)	81%	very high
August Weather	22°C (71°F)	135 mm (5.3 inches)	81%	very high
September Weather	18°C (64°F)	115 mm (4.5 inches)	81%	high
October Weather	9°C (49°F)	98 mm (3.9 inches)	84%	moderate
November Weather	1°C (33°F)	35 mm (1.4 inches)	88%	moderate
December Weather	-5°C (23°F)	50 mm (2.0 inches)	84%	low