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September Weather in Sioux Lookout, Canada

Last updated: June 18, 2025

In September, the average temperature in Sioux Lookout, Canada hovers around 12°C (54°F). Expect a range from a chilly -2°C (29°F) to a warm 28°C (82°F). During this month, rainfall totals about 133 mm (5.2 in) spread across 16 days, with an average humidity level of 73%.

September Temperature in Sioux Lookout

In September in Sioux Lookout, the average temperature is 12°C (54°F), with maximums reaching 28°C (82°F) and minimums dropping as low as -2°C (29°F). This makes it essential for travelers to pack layers to stay comfortable throughout the day.

September Weather in Sioux Lookout: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sioux Lookout, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sioux Lookout, September typically has an average temperature of 12°C (54°F), with highs reaching up to 28°C (82°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec5421324963686454402210
Data source: Temperature data for Sioux Lookout 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 Sioux Lookout

In Sioux Lookout in September, the total precipitation amount is 133 mm (5.2 in) spread over 16 days.

September Precipitation Trends in Sioux Lookout

The chart displays monthly precipitation patterns in Sioux Lookout, 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 Sioux Lookout, September typically receives around 133 mm (5.2 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec25302546638410486133834038
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sioux Lookout

In Sioux Lookout in September, humidity is 73%. With an average temperature of 12°C (54°F), this humidity feels like a chilly embrace, making travel moderately uncomfortable as the dampness can chill you to your bones, especially during early morning excursions or late afternoon strolls.

September Average Humidity in Sioux Lookout

This chart illustrates the average monthly humidity levels in Sioux Lookout, 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 Sioux Lookout is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec96%96%93%90%75%66%62%67%73%82%90%96%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sioux Lookout

In Sioux Lookout 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 Sioux Lookout, you can refer to this Hourly UV Index in Sioux Lookout.

Maximum UV Index Levels in Sioux Lookout for September

The chart shows the monthly maximum UV Index (UVI) for Sioux Lookout 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 Sioux Lookout typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789876421
Data source: Sioux Lookout 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 Sioux Lookout Compares to Other Months

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

This table compares monthly weather conditions in Sioux Lookout, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-15°C (5°F)25 mm (1.0 inches)96%low
February Weather-15°C (4°F)30 mm (1.2 inches)96%moderate
March Weather-6°C (22°F)25 mm (1.0 inches)93%moderate
April Weather0°C (33°F)46 mm (1.8 inches)90%high
May Weather10°C (50°F)63 mm (2.5 inches)75%very high
June Weather17°C (64°F)84 mm (3.3 inches)66%very high
July Weather20°C (68°F)104 mm (4.1 inches)62%very high
August Weather18°C (65°F)86 mm (3.4 inches)67%high
September Weather12°C (54°F)133 mm (5.2 inches)73%high
October Weather5°C (41°F)82 mm (3.2 inches)82%moderate
November Weather-6°C (22°F)40 mm (1.6 inches)90%low
December Weather-12°C (10°F)38 mm (1.5 inches)96%low

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