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September Weather in Clark Fork, United States

Last updated: June 24, 2025

In Clark Fork, United States, the average temperature in September hovers around 15°C (60°F). However, you can expect a range, with minimums dipping to 1°C (34°F) and maximums soaring up to 32°C (89°F). During this period, precipitation amounts to 61 mm (2.4 in) over the course of 7 days, complemented by an average humidity level of 71%.

September Temperature in Clark Fork

In September in Clark Fork, the average temperature is 15°C (60°F). The maximum can reach 32°C (89°F) and the minimum can be as low as 1°C (34°F). Be prepared for a wide range of temperatures when traveling to Clark Fork this month.

September Weather in Clark Fork: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Clark Fork, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Clark Fork, September typically has an average temperature of 15°C (60°F), with highs reaching up to 32°C (89°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec302735415259696959463731
Data source: Temperature data for Clark Fork 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 Clark Fork

In Clark Fork in September, the precipitation amount is 61 mm (2.4 in) over the course of 7 days.

September Precipitation Trends in Clark Fork

The chart displays monthly precipitation patterns in Clark Fork, 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 Clark Fork, September typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec12212895886742102961116144155
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Clark Fork

In Clark Fork in September humidity is 71%. With an average temperature of 15°C (60°F), this humidity feels like a warm blanket wrapped around you, making travel slightly uncomfortable as you feel sticky and sluggish.

September Average Humidity in Clark Fork

This chart illustrates the average monthly humidity levels in Clark Fork, 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 Clark Fork is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%93%91%88%83%80%82%71%71%85%90%96%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Clark Fork

In Clark Fork 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 Clark Fork.

Maximum UV Index Levels in Clark Fork for September

The chart shows the monthly maximum UV Index (UVI) for Clark Fork 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 Clark Fork typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246789997432
Data source: Clark Fork 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 Clark Fork Compares to Other Months

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

This table compares monthly weather conditions in Clark Fork, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)122 mm (4.8 inches)95%low
February Weather-3°C (27°F)128 mm (5.0 inches)93%moderate
March Weather1°C (35°F)95 mm (3.7 inches)91%high
April Weather5°C (42°F)88 mm (3.5 inches)88%high
May Weather11°C (52°F)67 mm (2.6 inches)83%very high
June Weather15°C (59°F)42 mm (1.7 inches)80%very high
July Weather20°C (69°F)10 mm (0.4 inches)82%very high
August Weather21°C (70°F)29 mm (1.1 inches)71%very high
September Weather15°C (60°F)61 mm (2.4 inches)71%high
October Weather8°C (46°F)116 mm (4.6 inches)85%moderate
November Weather3°C (37°F)144 mm (5.7 inches)90%moderate
December Weather0°C (31°F)155 mm (6.1 inches)96%low

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