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September Weather in Clam Falls, United States

Last updated: June 24, 2025

In September, the average temperature in Clam Falls, United States hovers around 17°C (62°F). Expect a range with minimums dipping to 1°C (34°F) and maximums reaching up to 31°C (89°F). This month sees an average precipitation of 97 mm (3.8 in) spread across 11 days, while the air humidity remains comfortably high at 80%.

September Temperature in Clam Falls

In September in Clam Falls, the average temperature is 17°C (62°F). The maximum can reach 31°C (89°F) and the minimum can be as low as 1°C (34°F). This variation in temperature makes Clam Falls an ideal destination for travelers looking to experience a mix of warm and cool weather during their visit.

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

The chart illustrates September temperature patterns in Clam Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Clam Falls, September typically has an average temperature of 17°C (62°F), with highs reaching up to 31°C (89°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec151531415768726962473122
Data source: Temperature data for Clam 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 Clam Falls

In Clam Falls in September, the total precipitation amount is 97 mm (3.8 in) over the course of 11 days.

September Precipitation Trends in Clam Falls

The chart displays monthly precipitation patterns in Clam 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 Clam Falls, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec233549931119910212597994258
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Clam Falls

In Clam Falls in September, humidity is 80%. With an average temperature of 17°C (62°F), this humidity feels like a heavy blanket wrapping around you, making travel sticky and uncomfortable, and often leaving you longing for a refreshing breeze.

September Average Humidity in Clam Falls

This chart illustrates the average monthly humidity levels in Clam 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 Clam Falls is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%89%86%85%79%80%80%78%80%84%89%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Clam Falls

In Clam 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 Clam Falls.

Maximum UV Index Levels in Clam Falls for September

The chart shows the monthly maximum UV Index (UVI) for Clam 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 Clam Falls typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: Clam 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 Clam Falls Compares to Other Months

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

This table compares monthly weather conditions in Clam Falls, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (15°F)23 mm (0.9 inches)88%low
February Weather-9°C (16°F)35 mm (1.4 inches)89%moderate
March Weather-1°C (31°F)49 mm (1.9 inches)86%moderate
April Weather5°C (42°F)92 mm (3.6 inches)85%high
May Weather14°C (57°F)111 mm (4.4 inches)79%very high
June Weather20°C (69°F)99 mm (3.9 inches)80%very high
July Weather22°C (72°F)102 mm (4.0 inches)80%very high
August Weather20°C (69°F)125 mm (4.9 inches)78%very high
September Weather17°C (62°F)97 mm (3.8 inches)80%high
October Weather8°C (47°F)99 mm (3.9 inches)84%moderate
November Weather0°C (32°F)42 mm (1.6 inches)89%moderate
December Weather-6°C (22°F)58 mm (2.3 inches)85%low

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