September Weather in Morongo Valley, United States

Last updated: June 24, 2025

In September, the average temperature in Morongo Valley, United States is a pleasant 25°C (78°F). However, temperatures can fluctuate significantly, with a minimum of 9°C (49°F) and a scorching maximum of 42°C (107°F). You can expect minimal precipitation of just 2 mm (0.1 in) over the course of 1 day, paired with an average humidity level of 52%.

September Temperature in Morongo Valley

In September in Morongo Valley, the average temperature is 25°C (78°F). The maximum can reach 42°C (107°F), while the minimum can be as low as 9°C (49°F). Be prepared for a wide range of temperatures, which makes it ideal for various outdoor activities during your travels.

September Weather in Morongo Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Morongo Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Morongo Valley, September typically has an average temperature of 25°C (78°F), with highs reaching up to 42°C (107°F) and lows dropping to around 9°C (49°F).

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

September Precipitation in Morongo Valley

In Morongo Valley in September, the precipitation amount is 2 mm (0.1 in) during one day.

September Precipitation Trends in Morongo Valley

The chart displays monthly precipitation patterns in Morongo Valley, 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 Morongo Valley, September typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 1 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 Morongo Valley

In Morongo Valley in September, humidity is 52%. With an average temperature of 25°C (78°F), this humidity feels like walking through a soft, warm veil, making traveling quite pleasant as the air maintains a comfortable embrace without being overly sticky or oppressive.

September Average Humidity in Morongo Valley

This chart illustrates the average monthly humidity levels in Morongo Valley, 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 Morongo Valley 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 Morongo Valley

In Morongo Valley 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 Morongo Valley.

Maximum UV Index Levels in Morongo Valley for September

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

Data source: Morongo Valley 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 Morongo Valley Compares to Other Months

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

This table compares monthly weather conditions in Morongo Valley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	30 mm (1.2 inches)	72%	moderate
February Weather	10°C (51°F)	32 mm (1.3 inches)	77%	high
March Weather	13°C (55°F)	22 mm (0.9 inches)	67%	very high
April Weather	17°C (64°F)	14 mm (0.5 inches)	56%	extreme
May Weather	20°C (69°F)	5 mm (0.2 inches)	46%	extreme
June Weather	26°C (80°F)	1 mm (0.1 inches)	48%	extreme
July Weather	29°C (85°F)	6 mm (0.3 inches)	46%	extreme
August Weather	29°C (85°F)	4 mm (0.2 inches)	42%	extreme
September Weather	25°C (78°F)	2 mm (0.1 inches)	52%	very high
October Weather	19°C (66°F)	5 mm (0.2 inches)	58%	very high
November Weather	14°C (58°F)	11 mm (0.4 inches)	66%	moderate
December Weather	9°C (49°F)	33 mm (1.3 inches)	74%	moderate