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September Weather in Walla Walla East, United States

Last updated: June 24, 2025

In Walla Walla East, United States, the average temperature in September is a pleasant 17°C (62°F). Expect a minimum of 1°C (35°F) and a maximum soaring to 36°C (97°F). During this month, you'll experience approximately 25 mm (1.0 in) of precipitation spread over about 4 days. With an average humidity of 58%, it’s a comfortable time to enjoy all that the season has to offer!

September Temperature in Walla Walla East

In September in Walla Walla East, the average temperature is 17°C (62°F). The maximum can reach 36°C (97°F) and the minimum can be as low as 1°C (35°F). This wide temperature range makes Walla Walla East a perfect destination for travelers seeking both warm and cool experiences.

September Weather in Walla Walla East: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Walla Walla East, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Walla Walla East, September typically has an average temperature of 17°C (62°F), with highs reaching up to 36°C (97°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec343441485765737262494134
Data source: Temperature data for Walla Walla East 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 Walla Walla East

In Walla Walla East in September, the precipitation amount is 25 mm (1.0 in) over the course of 4 days.

September Precipitation Trends in Walla Walla East

The chart displays monthly precipitation patterns in Walla Walla East, 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 Walla Walla East, September typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec77125756248273825628493
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Walla Walla East

In Walla Walla East in September, humidity is 58%. With an average temperature of 17°C (62°F), this humidity feels like a soft blanket wrapping around you, making it comfortable for traveling as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Walla Walla East

This chart illustrates the average monthly humidity levels in Walla Walla East, 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 Walla Walla East is approximately 58%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%85%83%77%81%77%60%58%75%85%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Walla Walla East

In Walla Walla East 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 Walla Walla East.

Maximum UV Index Levels in Walla Walla East for September

The chart shows the monthly maximum UV Index (UVI) for Walla Walla East 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 Walla Walla East typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24679101097532
Data source: Walla Walla East 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 Walla Walla East Compares to Other Months

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

This table compares monthly weather conditions in Walla Walla East, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)77 mm (3.0 inches)86%low
February Weather1°C (34°F)125 mm (4.9 inches)86%moderate
March Weather5°C (41°F)75 mm (3.0 inches)85%high
April Weather9°C (48°F)62 mm (2.4 inches)83%high
May Weather14°C (57°F)48 mm (1.9 inches)77%very high
June Weather18°C (65°F)27 mm (1.1 inches)81%very high
July Weather23°C (74°F)2 mm (0.1 inches)76%very high
August Weather22°C (72°F)8 mm (0.3 inches)60%very high
September Weather17°C (62°F)25 mm (1.0 inches)58%high
October Weather9°C (49°F)62 mm (2.4 inches)75%moderate
November Weather5°C (41°F)84 mm (3.3 inches)85%moderate
December Weather1°C (34°F)93 mm (3.7 inches)87%low

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