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September Weather in Claremont, United States

Last updated: June 24, 2025

In Claremont, United States, the average temperature in September hovers around 17°C (62°F). Expect a thrilling range, with minimums that can dip to -2°C (28°F) and maximums soaring up to 32°C (89°F). This month sees about 64 mm (2.5 in) of precipitation over 8 days, contributing to an average humidity of 71%. Stay prepared for a mix of weather!

September Temperature in Claremont

In September in Claremont, the average temperature is 17°C (62°F), with maximums reaching up to 32°C (89°F) and minimums plummeting as low as -2°C (28°F). Travelers should be prepared for a wide range of temperatures during this month.

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

The chart illustrates September temperature patterns in Claremont, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Claremont, September typically has an average temperature of 17°C (62°F), with highs reaching up to 32°C (89°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec222532445666716962503626
Data source: Temperature data for Claremont 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 Claremont

In Claremont in September, the precipitation amount is 64 mm (2.5 in) over the course of 8 days.

September Precipitation Trends in Claremont

The chart displays monthly precipitation patterns in Claremont, 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 Claremont, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec70817111678851208664132100102
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Claremont

In Claremont in September, humidity is 71%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace that can leave you feeling a bit sticky, making outdoor exploration both refreshing and slightly uncomfortable.

September Average Humidity in Claremont

This chart illustrates the average monthly humidity levels in Claremont, 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 Claremont is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Claremont

In Claremont in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Claremont.

Maximum UV Index Levels in Claremont for September

The chart shows the monthly maximum UV Index (UVI) for Claremont 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 Claremont typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910997532
Data source: Claremont 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 Claremont Compares to Other Months

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

This table compares monthly weather conditions in Claremont, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)70 mm (2.7 inches)86%moderate
February Weather-4°C (25°F)81 mm (3.2 inches)84%moderate
March Weather0°C (32°F)71 mm (2.8 inches)82%high
April Weather6°C (44°F)116 mm (4.6 inches)80%very high
May Weather13°C (56°F)78 mm (3.1 inches)72%very high
June Weather19°C (66°F)85 mm (3.4 inches)72%very high
July Weather22°C (71°F)120 mm (4.7 inches)67%very high
August Weather21°C (69°F)86 mm (3.4 inches)66%very high
September Weather17°C (62°F)64 mm (2.5 inches)71%high
October Weather10°C (50°F)132 mm (5.2 inches)78%moderate
November Weather2°C (36°F)100 mm (3.9 inches)84%moderate
December Weather-3°C (27°F)102 mm (4.0 inches)81%low

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