September Weather in Folsom, United States

Last updated: June 24, 2025

The average temperature in Folsom, United States during September is a pleasant 22°C (72°F). However, you can expect the minimum temperature to drop to 7°C (45°F) and the maximum to reach up to 34°C (94°F). During this time, the region sees about 110 mm (4.3 in) of precipitation spread over 11 days, with an average humidity of 74%.

September Temperature in Folsom

In September in Folsom, the average temperature is 22°C (72°F). The maximum can reach 34°C (94°F) and the minimum can be as low as 7°C (45°F). This diverse temperature range makes it a great time for travelers to enjoy a mix of warm and cooler experiences.

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

The chart illustrates September temperature patterns in Folsom, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Folsom, September typically has an average temperature of 22°C (72°F), with highs reaching up to 34°C (94°F) and lows dropping to around 7°C (45°F).

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

September Precipitation in Folsom

In Folsom in September, the precipitation amount is 110 mm (4.3 in) spread over 11 days.

September Precipitation Trends in Folsom

The chart displays monthly precipitation patterns in Folsom, 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 Folsom, September typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 11 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 Folsom

In Folsom in September, humidity is 74%. With an average temperature of 22°C (72°F), this humidity feels like a warm blanket enveloping you, making it a bit uncomfortable for traveling, as every step feels heavier and the air is thick.

September Average Humidity in Folsom

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

In Folsom in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Folsom.

Maximum UV Index Levels in Folsom for September

The chart shows the monthly maximum UV Index (UVI) for Folsom 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 Folsom typically reaches 8, which falls under the very high exposure category.

Data source: Folsom 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 Folsom Compares to Other Months

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

This table compares monthly weather conditions in Folsom, 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 (37°F)	62 mm (2.4 inches)	83%	moderate
February Weather	5°C (41°F)	99 mm (3.9 inches)	82%	moderate
March Weather	7°C (45°F)	108 mm (4.2 inches)	81%	high
April Weather	13°C (55°F)	100 mm (4.0 inches)	79%	very high
May Weather	18°C (64°F)	119 mm (4.7 inches)	74%	very high
June Weather	23°C (74°F)	109 mm (4.3 inches)	77%	very high
July Weather	26°C (79°F)	135 mm (5.3 inches)	76%	very high
August Weather	25°C (77°F)	153 mm (6.0 inches)	77%	very high
September Weather	22°C (72°F)	110 mm (4.3 inches)	74%	very high
October Weather	17°C (62°F)	128 mm (5.0 inches)	75%	high
November Weather	9°C (48°F)	76 mm (3.0 inches)	80%	moderate
December Weather	5°C (41°F)	103 mm (4.1 inches)	81%	moderate