September Weather in Calimesa, United States

Last updated: June 24, 2025

In September, the average temperature in Calimesa, United States hovers around 23°C (73°F). Expect to experience a minimum of 8°C (46°F) and soaring highs of 42°C (107°F). With an average humidity of 52%, the climate is quite comfortable. However, be prepared for some light rain, as the area receives approximately 10 mm (0.4 in) of precipitation over just 1 day during the month.

September Temperature in Calimesa

In September in Calimesa, the average temperature is 23°C (73°F). Maximum temperatures can reach 42°C (107°F) while minimums can drop to as low as 8°C (46°F). Be prepared for a range of temperatures and pack accordingly for your travels.

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

The chart illustrates September temperature patterns in Calimesa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Calimesa, September typically has an average temperature of 23°C (73°F), with highs reaching up to 42°C (107°F) and lows dropping to around 8°C (46°F).

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

September Precipitation in Calimesa

In Calimesa in September, the precipitation amount is 10 mm (0.4 in) over the course of 1 day.

September Precipitation Trends in Calimesa

The chart displays monthly precipitation patterns in Calimesa, 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 Calimesa, September typically receives around 10 mm (0.4 inches) of precipitation spread over approximately 1 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 Calimesa

In Calimesa in September humidity is 52%. With an average temperature of 23°C (73°F), this humidity feels like a comfortable embrace, making it pleasant for traveling as you can enjoy outdoor activities without feeling overheated or sticky.

September Average Humidity in Calimesa

This chart illustrates the average monthly humidity levels in Calimesa, 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 Calimesa is approximately 52%, 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 Calimesa

In Calimesa in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Calimesa.

Maximum UV Index Levels in Calimesa for September

The chart shows the monthly maximum UV Index (UVI) for Calimesa 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 Calimesa typically reaches 10, which falls under the very high exposure category.

Data source: Calimesa 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 Calimesa Compares to Other Months

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

This table compares monthly weather conditions in Calimesa, 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 (49°F)	62 mm (2.4 inches)	72%	moderate
February Weather	9°C (49°F)	66 mm (2.6 inches)	77%	high
March Weather	11°C (52°F)	57 mm (2.3 inches)	67%	very high
April Weather	15°C (59°F)	26 mm (1.0 inches)	56%	very high
May Weather	17°C (62°F)	15 mm (0.6 inches)	46%	extreme
June Weather	22°C (72°F)	3 mm (0.1 inches)	48%	extreme
July Weather	25°C (78°F)	13 mm (0.5 inches)	46%	extreme
August Weather	25°C (78°F)	10 mm (0.4 inches)	42%	extreme
September Weather	23°C (73°F)	10 mm (0.4 inches)	52%	very high
October Weather	18°C (64°F)	11 mm (0.4 inches)	58%	very high
November Weather	14°C (57°F)	23 mm (0.9 inches)	66%	moderate
December Weather	9°C (49°F)	59 mm (2.3 inches)	74%	moderate