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September Weather in Ellensburg, United States

Last updated: June 24, 2025

In Ellensburg, United States, the average temperature in September is a comfortable 15°C (60°F), but be prepared for fluctuations, as it can dip as low as 1°C (34°F) and soar up to 35°C (95°F). During this month, expect approximately 24 mm (1.0 in) of precipitation spread over about 4 days, contributing to an average humidity level of 62%.

September Temperature in Ellensburg

In September in Ellensburg, the average temperature is 15°C (60°F). Maximums can reach 35°C (95°F), while minimums can be as low as 1°C (34°F). This diverse range of temperatures makes Ellensburg an ideal destination for travelers looking to experience varied weather conditions.

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

The chart illustrates September temperature patterns in Ellensburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ellensburg, September typically has an average temperature of 15°C (60°F), with highs reaching up to 35°C (95°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec293138465662696960463631
Data source: Temperature data for Ellensburg 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 Ellensburg

In Ellensburg in September, the precipitation amount is 24 mm (1.0 in) over the course of 4 days.

September Precipitation Trends in Ellensburg

The chart displays monthly precipitation patterns in Ellensburg, 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 Ellensburg, September typically receives around 24 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec7575443823132524535872
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ellensburg

In Ellensburg in September, humidity is 62%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace, making it a bit muggy for traveling, yet pleasantly refreshing for leisurely strolls and outdoor exploration.

September Average Humidity in Ellensburg

This chart illustrates the average monthly humidity levels in Ellensburg, 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 Ellensburg is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Ellensburg

In Ellensburg 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 Ellensburg.

Maximum UV Index Levels in Ellensburg for September

The chart shows the monthly maximum UV Index (UVI) for Ellensburg 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 Ellensburg typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24679101098532
Data source: Ellensburg 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 Ellensburg Compares to Other Months

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

This table compares monthly weather conditions in Ellensburg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)75 mm (2.9 inches)86%low
February Weather-1°C (31°F)75 mm (3.0 inches)86%moderate
March Weather3°C (38°F)44 mm (1.7 inches)87%high
April Weather8°C (46°F)38 mm (1.5 inches)84%high
May Weather13°C (56°F)23 mm (0.9 inches)81%very high
June Weather17°C (63°F)13 mm (0.5 inches)82%very high
July Weather21°C (70°F)1 mm (0.1 inches)79%very high
August Weather21°C (69°F)5 mm (0.2 inches)63%very high
September Weather15°C (60°F)24 mm (1.0 inches)62%very high
October Weather8°C (46°F)53 mm (2.1 inches)83%moderate
November Weather2°C (37°F)58 mm (2.3 inches)89%moderate
December Weather-1°C (31°F)72 mm (2.8 inches)88%low

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