September Weather in Mentone, United States

Last updated: June 24, 2025

In Mentone, United States, the average temperature in September hovers around 20°C (68°F). Visitors can expect a minimum of 4°C (40°F) and can enjoy warm days with a maximum of 33°C (92°F). Rainfall is moderate, with an average of 74 mm (2.9 in) spread over 8 days. The atmosphere remains humid, with an average humidity level of 78%, making it a great time to explore the region!

September Temperature in Mentone

In September, in Mentone, the average temperature is 20°C (68°F). Maximums can reach 33°C (92°F), and minimums can be as low as 4°C (40°F). It's advisable to pack layers to accommodate both warm days and cooler nights while enjoying your travels.

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

The chart illustrates September temperature patterns in Mentone, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mentone, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (40°F).

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

September Precipitation in Mentone

In Mentone in September, the precipitation amount is 74 mm (2.9 in) over a period of 8 days.

September Precipitation Trends in Mentone

The chart displays monthly precipitation patterns in Mentone, 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 Mentone, September typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 8 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 Mentone

In Mentone in September humidity is 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

September Average Humidity in Mentone

This chart illustrates the average monthly humidity levels in Mentone, 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 Mentone is approximately 78%, 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 Mentone

In Mentone 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 Mentone.

Maximum UV Index Levels in Mentone for September

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

Data source: Mentone 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 Mentone Compares to Other Months

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

This table compares monthly weather conditions in Mentone, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	73 mm (2.9 inches)	85%	moderate
February Weather	-1°C (30°F)	77 mm (3.0 inches)	85%	moderate
March Weather	4°C (40°F)	104 mm (4.1 inches)	86%	high
April Weather	10°C (49°F)	101 mm (4.0 inches)	87%	very high
May Weather	17°C (62°F)	140 mm (5.5 inches)	81%	very high
June Weather	22°C (72°F)	112 mm (4.4 inches)	82%	very high
July Weather	24°C (76°F)	119 mm (4.7 inches)	81%	very high
August Weather	23°C (73°F)	103 mm (4.1 inches)	79%	very high
September Weather	20°C (68°F)	74 mm (2.9 inches)	78%	very high
October Weather	13°C (56°F)	116 mm (4.5 inches)	81%	high
November Weather	5°C (41°F)	80 mm (3.2 inches)	89%	moderate
December Weather	1°C (34°F)	62 mm (2.4 inches)	86%	low