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September Weather in Soap Lake, United States

Last updated: June 24, 2025

In September, the average temperature in Soap Lake, United States hovers around 18°C (65°F). It's a month where you might experience a minimum of 3°C (37°F) and a maximum soaring to 37°C (99°F). With precipitation totaling 18 mm (0.7 in) over just 3 days, you can expect a touch of moisture in the air, complemented by an average humidity level of 60%.

September Temperature in Soap Lake

In September in Soap Lake, the average temperature is 18°C (65°F). Maximums can reach up to 37°C (99°F), while minimums can drop as low as 3°C (37°F). Travelers should be prepared for a wide range of temperatures, so layering clothing is advisable.

September Weather in Soap Lake: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Soap Lake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Soap Lake, September typically has an average temperature of 18°C (65°F), with highs reaching up to 37°C (99°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec283041506269777665493830
Data source: Temperature data for Soap Lake 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 Soap Lake

In Soap Lake in September, the precipitation amount is 18 mm (0.7 in) over a span of 3 days.

September Precipitation Trends in Soap Lake

The chart displays monthly precipitation patterns in Soap Lake, 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 Soap Lake, September typically receives around 18 mm (0.7 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec514031292083418354043
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Soap Lake

In Soap Lake in September humidity is 60%. With an average temperature of 18°C (65°F), this humidity feels like a mild embrace, making it comfortable for exploring the sights, yet it can cause a slight stickiness in the air that may prompt occasional breaks and hydration.

September Average Humidity in Soap Lake

This chart illustrates the average monthly humidity levels in Soap Lake, 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 Soap Lake is approximately 60%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%82%77%79%77%62%60%80%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Soap Lake

In Soap Lake 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 Soap Lake.

Maximum UV Index Levels in Soap Lake for September

The chart shows the monthly maximum UV Index (UVI) for Soap Lake 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 Soap Lake typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2456891097532
Data source: Soap Lake 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 Soap Lake Compares to Other Months

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

This table compares monthly weather conditions in Soap Lake, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)51 mm (2.0 inches)85%low
February Weather-1°C (30°F)40 mm (1.6 inches)86%moderate
March Weather5°C (42°F)31 mm (1.2 inches)86%moderate
April Weather10°C (51°F)29 mm (1.2 inches)82%high
May Weather17°C (62°F)20 mm (0.8 inches)77%very high
June Weather21°C (69°F)8 mm (0.3 inches)79%very high
July Weather25°C (77°F)3 mm (0.1 inches)77%very high
August Weather24°C (76°F)4 mm (0.1 inches)62%very high
September Weather18°C (65°F)18 mm (0.7 inches)60%high
October Weather9°C (49°F)35 mm (1.4 inches)80%moderate
November Weather4°C (39°F)40 mm (1.6 inches)87%moderate
December Weather-1°C (30°F)43 mm (1.7 inches)86%low

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