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September Weather in Ritzville, United States

Last updated: June 24, 2025

In September, the average temperature in Ritzville, United States hovers around 19°C (66°F). Visitors can expect a minimum of 2°C (36°F) and a potential maximum of 37°C (99°F), making for quite the range! The region experiences about 17 mm (0.7 in) of precipitation over 4 days, accompanied by an average humidity level of 60%. Perfect weather for your next adventure!

September Temperature in Ritzville

In September, in Ritzville, the average temperature is 19°C (66°F). Maximum temperatures can reach as high as 37°C (99°F), while minimums can drop to as low as 2°C (36°F). This diverse climate makes Ritzville an ideal destination for travelers looking to experience both warmth and the potential for cooler evenings.

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

The chart illustrates September temperature patterns in Ritzville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ritzville, September typically has an average temperature of 19°C (66°F), with highs reaching up to 37°C (99°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec333343516270787765504033
Data source: Temperature data for Ritzville 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 Ritzville

In Ritzville in September, the precipitation amount is 17 mm (0.7 in) over a span of 4 days.

September Precipitation Trends in Ritzville

The chart displays monthly precipitation patterns in Ritzville, 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 Ritzville, September typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec5143413324131717385143
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ritzville

In Ritzville in September, humidity is 60%. With an average temperature of 19°C (66°F), this humidity feels like a warm, slightly sticky embrace, making traveling enjoyable yet necessitating occasional breaks to stay refreshed.

September Average Humidity in Ritzville

This chart illustrates the average monthly humidity levels in Ritzville, 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 Ritzville 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 Ritzville

In Ritzville 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 Ritzville.

Maximum UV Index Levels in Ritzville for September

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

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

This table compares monthly weather conditions in Ritzville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)51 mm (2.0 inches)85%low
February Weather0°C (33°F)43 mm (1.7 inches)86%moderate
March Weather6°C (43°F)41 mm (1.6 inches)86%moderate
April Weather10°C (51°F)33 mm (1.3 inches)82%high
May Weather17°C (62°F)24 mm (1.0 inches)77%very high
June Weather21°C (70°F)12 mm (0.5 inches)79%very high
July Weather26°C (78°F)1 mm (0.1 inches)77%very high
August Weather25°C (77°F)7 mm (0.3 inches)62%very high
September Weather19°C (66°F)17 mm (0.7 inches)60%high
October Weather10°C (50°F)38 mm (1.5 inches)80%moderate
November Weather4°C (40°F)51 mm (2.0 inches)87%moderate
December Weather1°C (33°F)43 mm (1.7 inches)86%low

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