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September Weather in Thompson Falls, United States

Last updated: June 24, 2025

In Thompson Falls, United States, the average temperature in September hovers around 13°C (55°F). During this month, you can expect fluctuations with a minimum of -4°C (25°F) and a maximum reaching up to 32°C (90°F). Be prepared for some moisture, as 42 mm (1.6 in) of precipitation may fall over seven days, contributing to an average humidity of 62%.

September Temperature in Thompson Falls

In September in Thompson Falls, the average temperature is 13°C (55°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop as low as -4°C (25°F). This temperature range suggests that travelers should prepare for both warm days and possibly chilly nights.

September Weather in Thompson Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Thompson Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Thompson Falls, September typically has an average temperature of 13°C (55°F), with highs reaching up to 32°C (90°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec252232395058676655413327
Data source: Temperature data for Thompson Falls 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 Thompson Falls

In Thompson Falls in September, the total precipitation amount is 42 mm (1.6 in) accumulated over a span of 7 days.

September Precipitation Trends in Thompson Falls

The chart displays monthly precipitation patterns in Thompson Falls, 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 Thompson Falls, September typically receives around 42 mm (1.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec851268089855918264292109107
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Thompson Falls

In Thompson Falls in September, humidity is 62%. With an average temperature of 13°C (55°F), this humidity feels like a cool, crisp embrace that can make outdoor activities refreshing yet somewhat damp, ideal for exploring but requiring a light jacket to stay comfortable.

September Average Humidity in Thompson Falls

This chart illustrates the average monthly humidity levels in Thompson Falls, 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 Thompson Falls is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%87%84%78%78%77%64%62%79%87%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Thompson Falls

In Thompson Falls 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 Thompson Falls.

Maximum UV Index Levels in Thompson Falls for September

The chart shows the monthly maximum UV Index (UVI) for Thompson Falls 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 Thompson Falls typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2467991097532
Data source: Thompson Falls 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 Thompson Falls Compares to Other Months

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

This table compares monthly weather conditions in Thompson Falls, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)85 mm (3.4 inches)89%low
February Weather-6°C (22°F)126 mm (5.0 inches)89%moderate
March Weather0°C (32°F)80 mm (3.1 inches)87%high
April Weather4°C (39°F)89 mm (3.5 inches)84%high
May Weather10°C (50°F)85 mm (3.4 inches)77%very high
June Weather14°C (58°F)59 mm (2.3 inches)78%very high
July Weather20°C (67°F)18 mm (0.7 inches)77%very high
August Weather19°C (66°F)26 mm (1.0 inches)64%very high
September Weather13°C (55°F)42 mm (1.6 inches)62%high
October Weather5°C (41°F)92 mm (3.6 inches)79%moderate
November Weather0°C (33°F)109 mm (4.3 inches)87%moderate
December Weather-3°C (27°F)107 mm (4.2 inches)90%low

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