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September Weather in Red Deer, Canada

Last updated: June 18, 2025

In September, the average temperature in Red Deer, Canada hovers around 10°C (51°F). Temperatures can range from a chilly -4°C (25°F) to a warm 31°C (87°F). Expect about 53 mm (2.1 in) of precipitation spread over 10 days, with an average humidity of 73%.

September Temperature in Red Deer

In September in Red Deer, the average temperature is 10°C (51°F). Maximum temperatures can reach 31°C (87°F), while minimums can drop as low as -4°C (25°F). Be prepared for a wide range of temperatures, so pack accordingly for your travels.

September Weather in Red Deer: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Red Deer, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Red Deer, September typically has an average temperature of 10°C (51°F), with highs reaching up to 31°C (87°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec151124365158626051372517
Data source: Temperature data for Red Deer 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 Red Deer

In Red Deer in September, the precipitation amount is 53 mm (2.1 in) spread over a duration of 10 days.

September Precipitation Trends in Red Deer

The chart displays monthly precipitation patterns in Red Deer, 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 Red Deer, September typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec122129326898874953283123
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Red Deer

In Red Deer in September, humidity is 73%. With an average temperature of 10°C (51°F), this humidity feels like a chilly dampness that can make outdoor activities uncomfortable, causing your clothes to cling to your skin and a persistent coolness that seeps into your bones, which might deter long excursions without proper layering.

September Average Humidity in Red Deer

This chart illustrates the average monthly humidity levels in Red Deer, 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 Red Deer is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%92%87%81%77%77%81%78%73%78%82%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Red Deer

In Red Deer 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 Red Deer, you can refer to this Hourly UV Index in Red Deer.

Maximum UV Index Levels in Red Deer for September

The chart shows the monthly maximum UV Index (UVI) for Red Deer 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 Red Deer typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234678876421
Data source: Red Deer 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 Red Deer Compares to Other Months

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

This table compares monthly weather conditions in Red Deer, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (15°F)11 mm (0.5 inches)90%low
February Weather-12°C (11°F)21 mm (0.8 inches)92%moderate
March Weather-4°C (24°F)29 mm (1.1 inches)87%moderate
April Weather2°C (36°F)32 mm (1.3 inches)81%high
May Weather10°C (51°F)68 mm (2.7 inches)77%high
June Weather15°C (59°F)98 mm (3.9 inches)77%very high
July Weather17°C (62°F)87 mm (3.4 inches)81%very high
August Weather16°C (60°F)49 mm (1.9 inches)78%high
September Weather10°C (51°F)53 mm (2.1 inches)73%high
October Weather3°C (37°F)28 mm (1.1 inches)78%moderate
November Weather-4°C (26°F)31 mm (1.2 inches)82%low
December Weather-8°C (17°F)23 mm (0.9 inches)91%low

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