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September Weather in Stilwell, United States

Last updated: June 24, 2025

In September, the average temperature in Stilwell, United States is a pleasant 24°C (75°F). Be prepared for a range of conditions, with minimum temperatures dipping to 8°C (46°F) and maximums soaring up to 37°C (99°F). Expect about 81 mm (3.2 in) of rainfall spread over 5 days, and enjoy a comfortable average humidity of 59%.

September Temperature in Stilwell

In September in Stilwell, the average temperature is 24°C (75°F). Maximums can reach 37°C (99°F) and minimums can be as low as 8°C (46°F). This means that travelers should be prepared for warm days, but also bring layers for cooler evenings.

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

The chart illustrates September temperature patterns in Stilwell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stilwell, September typically has an average temperature of 24°C (75°F), with highs reaching up to 37°C (99°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec394253586877817875614945
Data source: Temperature data for Stilwell 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 Stilwell

In Stilwell in September, the total precipitation amount is 81 mm (3.2 in) spread over a period of 5 days.

September Precipitation Trends in Stilwell

The chart displays monthly precipitation patterns in Stilwell, 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 Stilwell, September typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec9110813816320880104142811617587
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Stilwell

In Stilwell in September humidity is 59%. With an average temperature of 24°C (75°F), this humidity feels like a warm embrace, making outdoor activities refreshing yet slightly sticky, perfect for leisurely strolls but reminding travelers to stay hydrated.

September Average Humidity in Stilwell

This chart illustrates the average monthly humidity levels in Stilwell, 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 Stilwell is approximately 59%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%77%78%82%81%75%61%59%69%82%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stilwell

In Stilwell in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Stilwell.

Maximum UV Index Levels in Stilwell for September

The chart shows the monthly maximum UV Index (UVI) for Stilwell 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 Stilwell typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710101111109754
Data source: Stilwell 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 Stilwell Compares to Other Months

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

This table compares monthly weather conditions in Stilwell, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)91 mm (3.6 inches)82%moderate
February Weather5°C (42°F)108 mm (4.3 inches)79%high
March Weather12°C (53°F)138 mm (5.4 inches)77%high
April Weather15°C (59°F)163 mm (6.4 inches)78%very high
May Weather20°C (69°F)208 mm (8.2 inches)82%very high
June Weather25°C (77°F)80 mm (3.2 inches)81%extreme
July Weather27°C (81°F)104 mm (4.1 inches)75%extreme
August Weather26°C (79°F)142 mm (5.6 inches)61%very high
September Weather24°C (75°F)81 mm (3.2 inches)59%very high
October Weather16°C (62°F)161 mm (6.3 inches)69%high
November Weather10°C (50°F)75 mm (2.9 inches)82%moderate
December Weather7°C (45°F)87 mm (3.4 inches)87%moderate

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