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September Weather in Three Rivers, United States

Last updated: June 24, 2025

In Three Rivers, United States, the average temperature in September hovers around 13°C (56°F), with a minimum of -4°C (25°F) and a maximum of 35°C (96°F). Expect about 32 mm (1.3 in) of precipitation over 5 days, accompanied by an average humidity of 57%. Prepare accordingly for a month that can present a variety of weather experiences!

September Temperature in Three Rivers

In September in Three Rivers, the average temperature is 13°C (56°F). Maximum temperatures can reach 35°C (96°F), while minimums can drop as low as -4°C (25°F). Be prepared for a wide range of temperatures to make the most of your trip.

September Weather in Three Rivers: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Three Rivers, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Three Rivers, September typically has an average temperature of 13°C (56°F), with highs reaching up to 35°C (96°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec303135414957666556443630
Data source: Temperature data for Three Rivers 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 Three Rivers

In Three Rivers in September, the precipitation amount is 32 mm (1.3 in) over the course of 5 days.

September Precipitation Trends in Three Rivers

The chart displays monthly precipitation patterns in Three Rivers, 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 Three Rivers, September typically receives around 32 mm (1.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec871046561412481032437282
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Three Rivers

In Three Rivers in September, humidity is 57%. With an average temperature of 13°C (56°F), this humidity feels like a cool, refreshing dampness in the air, making it comfortable for exploring the area without feeling overheated.

September Average Humidity in Three Rivers

This chart illustrates the average monthly humidity levels in Three Rivers, 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 Three Rivers is approximately 57%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%87%86%79%80%77%60%57%76%87%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Three Rivers

In Three Rivers 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 Three Rivers.

Maximum UV Index Levels in Three Rivers for September

The chart shows the monthly maximum UV Index (UVI) for Three Rivers 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 Three Rivers typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111110108642
Data source: Three Rivers 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 Three Rivers Compares to Other Months

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

This table compares monthly weather conditions in Three Rivers, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)87 mm (3.4 inches)87%moderate
February Weather-1°C (31°F)104 mm (4.1 inches)87%moderate
March Weather2°C (36°F)65 mm (2.6 inches)87%high
April Weather5°C (41°F)61 mm (2.4 inches)86%very high
May Weather9°C (49°F)41 mm (1.6 inches)79%extreme
June Weather14°C (58°F)24 mm (0.9 inches)80%extreme
July Weather19°C (66°F)8 mm (0.3 inches)77%very high
August Weather18°C (66°F)10 mm (0.4 inches)60%very high
September Weather13°C (56°F)32 mm (1.3 inches)57%very high
October Weather7°C (44°F)43 mm (1.7 inches)76%high
November Weather2°C (36°F)72 mm (2.8 inches)87%moderate
December Weather-1°C (31°F)82 mm (3.2 inches)88%low

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