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September Weather in Stonewall, Canada

Last updated: June 18, 2025

In September, the average temperature in Stonewall, Canada hovers around 13°C (56°F). Expect a wide range in temperatures, with lows plummeting to -3°C (27°F) and highs soaring up to 32°C (91°F). This month also brings 96 mm (3.8 in) of precipitation over 11 days, contributing to an average humidity of 82%. Be prepared for a mix of weather as you explore!

September Temperature in Stonewall

In September in Stonewall, the average temperature is 13°C (56°F). Maximum temperatures can reach 32°C (91°F), while the minimum can dip as low as -3°C (27°F). Expect a wide range of weather conditions, so be prepared for both warm and chilly experiences during your travels.

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 13°C (56°F), with highs reaching up to 32°C (91°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec6322365265706656412312
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 precipitation amount is 96 mm (3.8 in) spread over 11 days, resulting in a significant accumulation of rainfall.

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 96 mm (3.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec181619303377616396552723
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 82%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making it feel much cooler than it is and creating a heavy atmosphere that can be exhausting for travelers.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%94%93%84%76%71%78%82%82%85%88%94%
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 is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Stonewall, you can refer to this 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 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec244679886421
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 Weather-15°C (6°F)18 mm (0.7 inches)95%low
February Weather-16°C (4°F)16 mm (0.6 inches)94%moderate
March Weather-5°C (23°F)19 mm (0.8 inches)93%moderate
April Weather2°C (36°F)30 mm (1.2 inches)84%high
May Weather11°C (53°F)33 mm (1.3 inches)76%high
June Weather18°C (65°F)77 mm (3.0 inches)71%very high
July Weather21°C (70°F)61 mm (2.4 inches)78%very high
August Weather19°C (66°F)63 mm (2.5 inches)82%very high
September Weather13°C (56°F)96 mm (3.8 inches)82%high
October Weather5°C (41°F)55 mm (2.2 inches)85%moderate
November Weather-5°C (24°F)27 mm (1.1 inches)87%low
December Weather-11°C (12°F)23 mm (0.9 inches)94%low

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