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September Weather in Slave Lake, Canada

Last updated: June 18, 2025

In Slave Lake, Canada, the average temperature in September hovers around 9°C (49°F). Expect a chilly minimum of -4°C (24°F) and the possibility of a pleasant maximum reaching 28°C (82°F). During this time, anticipate 55 mm (2.2 in) of precipitation spread over 10 days, contributing to an average humidity of 73%. Stay prepared for the weather!

September Temperature in Slave Lake

In September in Slave Lake, the average temperature is 9°C (49°F), with maximums reaching 28°C (82°F) and minimums dipping as low as -4°C (24°F). It's essential to pack for both warm and cold weather if you're planning to travel during this time.

September Weather in Slave Lake: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Slave Lake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Slave Lake, September typically has an average temperature of 9°C (49°F), with highs reaching up to 28°C (82°F) and lows dropping to around -4°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec12822345057615848362214
Data source: Temperature data for Slave Lake 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 Slave Lake

In Slave Lake in September, the precipitation amount is 55 mm (2.2 in) spread over a duration of 10 days.

September Precipitation Trends in Slave Lake

The chart displays monthly precipitation patterns in Slave Lake, 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 Slave Lake, September typically receives around 55 mm (2.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec22242334411131216756444022
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Slave Lake

In Slave Lake in September, humidity is 73%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill in the air, making outdoor activities slightly uncomfortable and requiring extra layers for warmth while traveling.

September Average Humidity in Slave Lake

This chart illustrates the average monthly humidity levels in Slave Lake, 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 Slave Lake is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%93%91%78%70%70%79%78%73%81%85%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Slave Lake

In Slave Lake 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 Slave Lake, you can refer to this Hourly UV Index in Slave Lake.

Maximum UV Index Levels in Slave Lake for September

The chart shows the monthly maximum UV Index (UVI) for Slave Lake 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 Slave Lake typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124577776311
Data source: Slave Lake 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 Slave Lake Compares to Other Months

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

This table compares monthly weather conditions in Slave Lake, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (12°F)21 mm (0.8 inches)88%low
February Weather-13°C (8°F)24 mm (0.9 inches)93%low
March Weather-6°C (22°F)23 mm (0.9 inches)90%moderate
April Weather1°C (34°F)34 mm (1.3 inches)78%moderate
May Weather10°C (50°F)41 mm (1.6 inches)70%high
June Weather14°C (58°F)113 mm (4.4 inches)70%high
July Weather16°C (61°F)121 mm (4.7 inches)79%high
August Weather14°C (58°F)67 mm (2.7 inches)78%high
September Weather9°C (49°F)55 mm (2.2 inches)73%high
October Weather2°C (36°F)44 mm (1.7 inches)81%moderate
November Weather-6°C (22°F)40 mm (1.6 inches)85%low
December Weather-10°C (14°F)22 mm (0.9 inches)93%low

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