September Weather in Placerville, United States

Last updated: June 24, 2025

In Placerville, United States, the average temperature in September is a pleasant 22°C (71°F). However, it can swing from a chilly 6°C (43°F) to a sizzling 40°C (105°F). Expect a modest precipitation of 15 mm (0.6 in) over the course of just 2 days, with an average humidity level of 44%. Enjoy the variety that this month brings!

September Temperature in Placerville

In September in Placerville, the average temperature is 22°C (71°F), with maximums potentially reaching 40°C (105°F) and minimums dipping as low as 6°C (43°F). Be prepared for warm days and cool evenings, making it an excellent time for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Placerville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Placerville, September typically has an average temperature of 22°C (71°F), with highs reaching up to 40°C (105°F) and lows dropping to around 6°C (43°F).

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

September Precipitation in Placerville

In Placerville in September, the precipitation amount is 15 mm (0.6 in) over the course of 2 days.

September Precipitation Trends in Placerville

The chart displays monthly precipitation patterns in Placerville, 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 Placerville, September typically receives around 15 mm (0.6 inches) of precipitation spread over approximately 2 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 Placerville

In Placerville in September, humidity is 44%. With an average temperature of 22°C (71°F), this humidity feels like a refreshing embrace, making it pleasant for traveling and exploring the sights without discomfort.

September Average Humidity in Placerville

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

In Placerville 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 Placerville.

Maximum UV Index Levels in Placerville for September

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

Data source: Placerville 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 Placerville Compares to Other Months

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

This table compares monthly weather conditions in Placerville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (46°F)	226 mm (8.9 inches)	84%	moderate
February Weather	8°C (47°F)	231 mm (9.1 inches)	84%	moderate
March Weather	9°C (49°F)	249 mm (9.8 inches)	83%	very high
April Weather	13°C (56°F)	115 mm (4.5 inches)	81%	very high
May Weather	16°C (62°F)	69 mm (2.7 inches)	74%	extreme
June Weather	22°C (72°F)	8 mm (0.3 inches)	64%	extreme
July Weather	26°C (78°F)	0 mm (0.0 inches)	44%	extreme
August Weather	25°C (77°F)	0 mm (0.0 inches)	36%	very high
September Weather	22°C (71°F)	15 mm (0.6 inches)	44%	very high
October Weather	16°C (61°F)	62 mm (2.4 inches)	65%	high
November Weather	11°C (52°F)	128 mm (5.0 inches)	84%	moderate
December Weather	7°C (45°F)	179 mm (7.1 inches)	83%	moderate