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September Weather in Mentone, United States

Last updated: June 24, 2025

In Mentone, United States, the average temperature in September hovers around 26°C (80°F). However, temperatures can vary significantly, with a minimum of 9°C (48°F) and a maximum soaring to 40°C (105°F). During this month, expect about 34 mm (1.3 in) of precipitation over 5 days, coupled with an average humidity of 74%.

September Temperature in Mentone

In September in Mentone, the average temperature is 26°C (80°F). Maximums can reach 40°C (105°F), and minimums can be as low as 9°C (48°F). Be prepared for a wide temperature range and plan activities accordingly to make the most of your trip!

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 26°C (80°F), with highs reaching up to 40°C (105°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec475161707986878679695750
Data source: Temperature data for Mentone generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Mentone

In Mentone in September, the precipitation amount is 34 mm (1.3 in) over the course of 5 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 34 mm (1.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec12102210152816263422910
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mentone

In Mentone in September humidity is 74%. With an average temperature of 26°C (80°F), this humidity feels like a warm, thick blanket wrapping around you, making any outdoor activities feel more strenuous and sweat-inducing, so staying hydrated and taking frequent breaks in the shade is essential for enjoyable traveling.

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 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%74%63%61%68%70%70%67%74%75%84%85%
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 reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5810121212121211965
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.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)12 mm (0.5 inches)76%moderate
February Weather11°C (51°F)10 mm (0.4 inches)74%very high
March Weather16°C (62°F)22 mm (0.9 inches)63%very high
April Weather21°C (70°F)10 mm (0.4 inches)61%extreme
May Weather26°C (79°F)15 mm (0.6 inches)68%extreme
June Weather30°C (86°F)28 mm (1.1 inches)70%extreme
July Weather30°C (87°F)16 mm (0.6 inches)70%extreme
August Weather30°C (87°F)26 mm (1.0 inches)67%extreme
September Weather26°C (80°F)34 mm (1.3 inches)74%extreme
October Weather20°C (69°F)22 mm (0.9 inches)75%very high
November Weather14°C (57°F)8 mm (0.3 inches)84%high
December Weather10°C (50°F)10 mm (0.4 inches)85%moderate

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