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September Weather in Spokane, United States

Last updated: June 24, 2025

In September, the average temperature in Spokane, United States hovers around 17°C (62°F), creating a pleasant climate. Expect temperatures to range from a chilly 2°C (35°F) to a warm 34°C (94°F). You'll experience moderate precipitation, with about 30 mm (1.2 in) of rain falling over 5 days. The average humidity rests at around 60%, perfect for enjoying the outdoors!

September Temperature in Spokane

In September in Spokane, the average temperature is 17°C (62°F). Maximum temperatures can reach 34°C (94°F), while minimums can drop as low as 2°C (35°F). Travelers should be prepared for a wide range of temperatures during this time.

September Weather in Spokane: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Spokane, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Spokane, September typically has an average temperature of 17°C (62°F), with highs reaching up to 34°C (94°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec303039475866747362473831
Data source: Temperature data for Spokane 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 Spokane

In Spokane in September, the precipitation amount is 30 mm (1.2 in) over the course of 5 days.

September Precipitation Trends in Spokane

The chart displays monthly precipitation patterns in Spokane, 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 Spokane, September typically receives around 30 mm (1.2 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec76656052502141231557974
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Spokane

In Spokane in September humidity is 60%. With an average temperature of 17°C (62°F), this humidity feels like a refreshing embrace, making travel both comfortable and invigorating as you explore the sights without feeling overly sticky or uncomfortable.

September Average Humidity in Spokane

This chart illustrates the average monthly humidity levels in Spokane, 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 Spokane is approximately 60%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%82%77%79%77%62%60%80%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Spokane

In Spokane 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 Spokane.

Maximum UV Index Levels in Spokane for September

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

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

This table compares monthly weather conditions in Spokane, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)76 mm (3.0 inches)85%low
February Weather-1°C (30°F)65 mm (2.6 inches)86%moderate
March Weather4°C (40°F)60 mm (2.4 inches)86%moderate
April Weather8°C (47°F)52 mm (2.1 inches)82%high
May Weather14°C (58°F)50 mm (2.0 inches)77%very high
June Weather19°C (66°F)21 mm (0.8 inches)79%very high
July Weather23°C (75°F)4 mm (0.1 inches)77%very high
August Weather23°C (73°F)11 mm (0.5 inches)62%very high
September Weather17°C (62°F)30 mm (1.2 inches)60%high
October Weather8°C (47°F)55 mm (2.2 inches)80%moderate
November Weather3°C (38°F)79 mm (3.1 inches)87%moderate
December Weather0°C (32°F)74 mm (2.9 inches)86%low

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