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September Weather in South Wenatchee, United States

Last updated: June 24, 2025

In September, the average temperature in South Wenatchee, United States hovers around 15°C (60°F), with a potential minimum of 1°C (35°F) and a sweltering maximum of 35°C (95°F). Expect approximately 26 mm (1.0 in) of precipitation spread over 4 days, and enjoy an average humidity of 62%. Make sure to prepare for a mix of conditions!

September Temperature in South Wenatchee

In September in South Wenatchee, the average temperature is 15°C (60°F). Maximums can reach 35°C (95°F) and minimums can be as low as 1°C (35°F). Be prepared for a wide range of temperatures during your travels, so pack accordingly!

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

The chart illustrates September temperature patterns in South Wenatchee, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Wenatchee, 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 (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec282937465663706960463629
Data source: Temperature data for South Wenatchee 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 Wenatchee

In South Wenatchee in September, the precipitation amount is 26 mm (1.0 in) over the course of 4 days.

September Precipitation Trends in South Wenatchee

The chart displays monthly precipitation patterns in South Wenatchee, 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 Wenatchee, September typically receives around 26 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec8476464127143526566479
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Wenatchee

In South Wenatchee 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 South Wenatchee

This chart illustrates the average monthly humidity levels in South Wenatchee, 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 Wenatchee 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 Wenatchee

In South Wenatchee 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 South Wenatchee.

Maximum UV Index Levels in South Wenatchee for September

The chart shows the monthly maximum UV Index (UVI) for South Wenatchee 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 Wenatchee typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2467891097532
Data source: South Wenatchee 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 Wenatchee Compares to Other Months

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

This table compares monthly weather conditions in South Wenatchee, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)84 mm (3.3 inches)86%low
February Weather-2°C (29°F)76 mm (3.0 inches)86%moderate
March Weather3°C (38°F)46 mm (1.8 inches)87%high
April Weather8°C (46°F)41 mm (1.6 inches)84%high
May Weather13°C (56°F)26 mm (1.0 inches)81%very high
June Weather17°C (63°F)14 mm (0.5 inches)82%very high
July Weather21°C (70°F)3 mm (0.1 inches)79%very high
August Weather21°C (70°F)5 mm (0.2 inches)63%very high
September Weather15°C (60°F)26 mm (1.0 inches)62%high
October Weather8°C (46°F)56 mm (2.2 inches)83%moderate
November Weather2°C (37°F)64 mm (2.5 inches)89%moderate
December Weather-1°C (30°F)79 mm (3.1 inches)88%low

Compare South Wenatchee's Climate with Cities Worldwide