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September Weather in Post Falls, United States

Last updated: June 24, 2025

In September, the average temperature in Post Falls, United States hovers around 16°C (61°F), offering a pleasant climate for outdoor activities. Expect minimums as cool as 1°C (35°F) and maximums soaring to 34°C (94°F). While you enjoy the warmth, be prepared for 42 mm (1.6 in) of precipitation over 5 days, along with an average humidity of 62%.

September Temperature in Post Falls

In September in Post Falls, the average temperature is 16°C (61°F). The maximum can reach 34°C (94°F), while the minimum can drop as low as 1°C (35°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your trip.

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

The chart illustrates September temperature patterns in Post Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Post Falls, September typically has an average temperature of 16°C (61°F), with highs reaching up to 34°C (94°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec302938465664737261473832
Data source: Temperature data for Post 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 Post Falls

In Post Falls in September, the precipitation amount is 42 mm (1.6 in) over a period of 5 days.

September Precipitation Trends in Post Falls

The chart displays monthly precipitation patterns in Post 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 Post Falls, September typically receives around 42 mm (1.6 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec928876726030613427410396
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Post Falls

In Post Falls in September, humidity is 62%. With an average temperature of 16°C (61°F), this humidity feels like a gentle blanket, making traveling comfortable yet occasionally sticky, prompting the need for light, breathable clothing to fully enjoy the sights.

September Average Humidity in Post Falls

This chart illustrates the average monthly humidity levels in Post 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 Post 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 Post Falls

In Post 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 Post Falls.

Maximum UV Index Levels in Post Falls for September

The chart shows the monthly maximum UV Index (UVI) for Post 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 Post Falls typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2456891097532
Data source: Post 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 Post Falls Compares to Other Months

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

This table compares monthly weather conditions in Post Falls, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)92 mm (3.6 inches)89%low
February Weather-1°C (30°F)88 mm (3.4 inches)89%moderate
March Weather3°C (38°F)76 mm (3.0 inches)87%moderate
April Weather8°C (46°F)72 mm (2.8 inches)84%high
May Weather13°C (56°F)60 mm (2.3 inches)77%very high
June Weather18°C (65°F)30 mm (1.2 inches)78%very high
July Weather23°C (73°F)5 mm (0.2 inches)77%very high
August Weather22°C (72°F)13 mm (0.5 inches)64%very high
September Weather16°C (61°F)42 mm (1.6 inches)62%high
October Weather8°C (47°F)74 mm (2.9 inches)79%moderate
November Weather3°C (38°F)103 mm (4.1 inches)87%moderate
December Weather0°C (32°F)95 mm (3.8 inches)90%low

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