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September Weather in Stonewall, United States

Last updated: June 24, 2025

In Stonewall, United States, the average temperature in September hovers around 25°C (78°F). Visitors can expect a minimum of 9°C (48°F) and a maximum of 37°C (99°F), making it a month of varied weather. This period sees about 93 mm (3.7 in) of precipitation spread over 8 days, coupled with an average humidity level of 66%. Whether you're planning adventures or relaxing indoors, be prepared for a dynamic climate!

September Temperature in Stonewall

In September in Stonewall, the average temperature is 25°C (78°F). Maximum temperatures can reach up to 37°C (99°F), while minimum temperatures can drop as low as 9°C (48°F). Travelers should be prepared for a range of temperatures and pack accordingly for both warm days and cooler nights.

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

The chart illustrates September temperature patterns in Stonewall, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stonewall, September typically has an average temperature of 25°C (78°F), with highs reaching up to 37°C (99°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec505161667480838377685853
Data source: Temperature data for Stonewall 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 Stonewall

In Stonewall in September, the total precipitation amount is 93 mm (3.7 in) over the course of 8 days.

September Precipitation Trends in Stonewall

The chart displays monthly precipitation patterns in Stonewall, 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 Stonewall, September typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec4763687114165516793943042
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Stonewall

In Stonewall in September, humidity is 66%. With an average temperature of 25°C (78°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel more draining, yet still enjoyable for short adventures.

September Average Humidity in Stonewall

This chart illustrates the average monthly humidity levels in Stonewall, 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 Stonewall is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%78%77%78%82%78%69%63%66%73%84%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stonewall

In Stonewall in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Stonewall.

Maximum UV Index Levels in Stonewall for September

The chart shows the monthly maximum UV Index (UVI) for Stonewall 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 Stonewall typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112121111965
Data source: Stonewall 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 Stonewall Compares to Other Months

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

This table compares monthly weather conditions in Stonewall, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)47 mm (1.8 inches)78%moderate
February Weather11°C (52°F)62 mm (2.5 inches)78%very high
March Weather16°C (62°F)68 mm (2.7 inches)77%very high
April Weather19°C (67°F)71 mm (2.8 inches)78%extreme
May Weather23°C (74°F)141 mm (5.6 inches)82%extreme
June Weather27°C (80°F)65 mm (2.6 inches)78%extreme
July Weather28°C (83°F)50 mm (2.0 inches)69%extreme
August Weather28°C (83°F)67 mm (2.6 inches)63%extreme
September Weather25°C (78°F)93 mm (3.7 inches)66%extreme
October Weather20°C (68°F)94 mm (3.7 inches)73%very high
November Weather14°C (58°F)30 mm (1.2 inches)84%high
December Weather12°C (53°F)42 mm (1.6 inches)87%moderate

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