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September Weather in Pendleton, United States

Last updated: June 24, 2025

In Pendleton, United States, the average temperature in September is a pleasant 21°C (70°F). Expect minimums that can dip to 5°C (41°F) and maximums soaring to 33°C (91°F). During this month, anticipate around 79 mm (3.1 in) of precipitation over 7 days, paired with an average humidity of 69%. Perfect for enjoying outdoor activities with a bit of preparation!

September Temperature in Pendleton

In September, in Pendleton, the average temperature is 21°C (70°F). Maximums can reach 33°C (91°F), and minimums can be as low as 5°C (41°F). This makes Pendleton an ideal destination for travelers seeking a mild climate with the possibility of warm days and cool evenings.

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

The chart illustrates September temperature patterns in Pendleton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pendleton, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (91°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec303342526473767469574136
Data source: Temperature data for Pendleton 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 Pendleton

In Pendleton in September, the total precipitation amount is 79 mm (3.1 in) distributed over a period of 7 days.

September Precipitation Trends in Pendleton

The chart displays monthly precipitation patterns in Pendleton, 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 Pendleton, September typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec82951249713610311287791029077
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Pendleton

In Pendleton in September humidity is 69%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but requiring occasional breaks for hydration and shade during your travels.

September Average Humidity in Pendleton

This chart illustrates the average monthly humidity levels in Pendleton, 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 Pendleton is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Pendleton

In Pendleton in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Pendleton.

Maximum UV Index Levels in Pendleton for September

The chart shows the monthly maximum UV Index (UVI) for Pendleton 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 Pendleton typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Pendleton 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 Pendleton Compares to Other Months

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

This table compares monthly weather conditions in Pendleton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)81 mm (3.2 inches)87%moderate
February Weather1°C (33°F)95 mm (3.7 inches)85%moderate
March Weather6°C (42°F)124 mm (4.9 inches)86%high
April Weather11°C (52°F)96 mm (3.8 inches)84%very high
May Weather18°C (64°F)136 mm (5.4 inches)79%very high
June Weather23°C (73°F)103 mm (4.1 inches)82%extreme
July Weather25°C (76°F)112 mm (4.4 inches)79%very high
August Weather23°C (74°F)87 mm (3.4 inches)70%very high
September Weather21°C (70°F)79 mm (3.1 inches)69%very high
October Weather14°C (58°F)102 mm (4.0 inches)76%high
November Weather5°C (42°F)90 mm (3.5 inches)88%moderate
December Weather2°C (36°F)77 mm (3.0 inches)87%moderate

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