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September Weather in South Cle Elum, United States

Last updated: June 24, 2025

In South Cle Elum, United States, the average temperature in September is a mild 12°C (53°F). However, temperatures can swing dramatically, with lows dipping to -2°C (29°F) and highs soaring to 31°C (88°F). Expect some rain, as 51 mm (2.0 in) of precipitation typically falls over 9 days, while the average humidity hovers around 62%.

September Temperature in South Cle Elum

In September in South Cle Elum, the average temperature is 12°C (53°F). Maximum temperatures can reach 31°C (88°F), while minimums can drop as low as -2°C (29°F). This wide range of temperatures means that travelers should be prepared for both warm days and chilly nights.

September Weather in South Cle Elum: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Cle Elum, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Cle Elum, September typically has an average temperature of 12°C (53°F), with highs reaching up to 31°C (88°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec272632384853606153413327
Data source: Temperature data for South Cle Elum 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 South Cle Elum

In South Cle Elum in September, the total precipitation amount is 51 mm (2.0 in) spread over 9 days.

September Precipitation Trends in South Cle Elum

The chart displays monthly precipitation patterns in South Cle Elum, 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 South Cle Elum, September typically receives around 51 mm (2.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec148170947953387751112131164
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Cle Elum

In South Cle Elum in September, humidity is 62%. With an average temperature of 12°C (53°F), this humidity feels like a cool, damp embrace that can make outdoor adventures feel brisk and invigorating, though it may require a light jacket and an extra layer for comfort while exploring.

September Average Humidity in South Cle Elum

This chart illustrates the average monthly humidity levels in South Cle Elum, 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 South Cle Elum 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 South Cle Elum

In South Cle Elum 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 South Cle Elum.

Maximum UV Index Levels in South Cle Elum for September

The chart shows the monthly maximum UV Index (UVI) for South Cle Elum 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 South Cle Elum typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246710101098532
Data source: South Cle Elum 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 South Cle Elum Compares to Other Months

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

This table compares monthly weather conditions in South Cle Elum, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)148 mm (5.8 inches)86%low
February Weather-3°C (26°F)170 mm (6.7 inches)86%moderate
March Weather0°C (33°F)94 mm (3.7 inches)87%high
April Weather3°C (38°F)79 mm (3.1 inches)84%high
May Weather9°C (48°F)53 mm (2.1 inches)81%very high
June Weather12°C (54°F)38 mm (1.5 inches)82%very high
July Weather15°C (60°F)7 mm (0.3 inches)79%very high
August Weather16°C (61°F)7 mm (0.3 inches)63%very high
September Weather12°C (53°F)51 mm (2.0 inches)62%very high
October Weather5°C (41°F)112 mm (4.4 inches)83%moderate
November Weather1°C (33°F)131 mm (5.1 inches)89%moderate
December Weather-3°C (27°F)164 mm (6.4 inches)88%low

Compare South Cle Elum's Climate with Cities Worldwide