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September Weather in Pullman, United States

Last updated: June 24, 2025

In Pullman, United States, the average temperature in September hovers around 17°C (63°F). Expect a minimum chill of 3°C (37°F) and a warm peak of 35°C (95°F). During this month, you'll encounter about 22 mm (0.9 in) of precipitation spread over 4 days, with an average humidity level of 62%.

September Temperature in Pullman

In September in Pullman, the average temperature is 17°C (63°F). Maximums can reach 35°C (95°F), while minimums can drop to as low as 3°C (37°F). This diverse temperature range makes Pullman an excellent destination for travelers seeking a mix of warm and cool weather experiences.

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

The chart illustrates September temperature patterns in Pullman, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pullman, September typically has an average temperature of 17°C (63°F), with highs reaching up to 35°C (95°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec333341485765747363494033
Data source: Temperature data for Pullman 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 Pullman

In Pullman in September, the precipitation amount is 22 mm (0.9 in) over a duration of 4 days.

September Precipitation Trends in Pullman

The chart displays monthly precipitation patterns in Pullman, 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 Pullman, September typically receives around 22 mm (0.9 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec7098685752273822648285
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Pullman

In Pullman in September humidity is 62%. With an average temperature of 17°C (63°F), this humidity feels like a refreshing embrace, making it pleasant for traveling as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Pullman

This chart illustrates the average monthly humidity levels in Pullman, 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 Pullman 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 Pullman

In Pullman 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 Pullman.

Maximum UV Index Levels in Pullman for September

The chart shows the monthly maximum UV Index (UVI) for Pullman 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 Pullman typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457991097532
Data source: Pullman 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 Pullman Compares to Other Months

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

This table compares monthly weather conditions in Pullman, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)70 mm (2.8 inches)89%low
February Weather0°C (33°F)98 mm (3.9 inches)89%moderate
March Weather5°C (41°F)68 mm (2.7 inches)87%moderate
April Weather9°C (48°F)57 mm (2.2 inches)84%high
May Weather14°C (57°F)52 mm (2.1 inches)77%very high
June Weather18°C (65°F)27 mm (1.1 inches)78%very high
July Weather24°C (75°F)3 mm (0.1 inches)77%very high
August Weather23°C (74°F)8 mm (0.3 inches)64%very high
September Weather17°C (63°F)22 mm (0.9 inches)62%high
October Weather9°C (49°F)64 mm (2.5 inches)79%moderate
November Weather4°C (40°F)82 mm (3.2 inches)87%moderate
December Weather1°C (33°F)85 mm (3.3 inches)90%low

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