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September Weather in Louiseville, Canada

Last updated: June 18, 2025

In September, the average temperature in Louiseville, Canada is a mild 15°C (60°F), with extremes ranging from a chilly 1°C (34°F) to a warm 30°C (87°F). Be prepared for some rain, as 64 mm (2.5 in) of precipitation can be expected over 9 days. The air tends to be quite humid, with an average humidity level of 78%, making it feel a bit warmer than it is.

September Temperature in Louiseville

In September in Louiseville, the average temperature is 15°C (60°F). Maximums can reach 30°C (87°F) and minimums can be as low as 1°C (34°F). This varied climate makes Louiseville an ideal destination for travelers seeking both warmth and a refreshing chill.

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

The chart illustrates September temperature patterns in Louiseville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Louiseville, September typically has an average temperature of 15°C (60°F), with highs reaching up to 30°C (87°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec151726405565716860483220
Data source: Temperature data for Louiseville 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 Louiseville

In Louiseville in September, the precipitation amount is 64 mm (2.5 in) over a span of 9 days.

September Precipitation Trends in Louiseville

The chart displays monthly precipitation patterns in Louiseville, 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 Louiseville, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec83828711692100891036412211595
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Louiseville

In Louiseville in September, humidity is 78%. With an average temperature of 15°C (60°F), this humidity feels like a warm, damp embrace that can make outdoor activities a bit uncomfortable, highlighting the importance of staying hydrated and taking breaks in the shade while exploring.

September Average Humidity in Louiseville

This chart illustrates the average monthly humidity levels in Louiseville, 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 Louiseville is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%94%90%86%78%71%79%78%78%87%90%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Louiseville

In Louiseville in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Louiseville.

Maximum UV Index Levels in Louiseville for September

The chart shows the monthly maximum UV Index (UVI) for Louiseville 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 Louiseville typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235799887532
Data source: Louiseville 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 Louiseville Compares to Other Months

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

This table compares monthly weather conditions in Louiseville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (15°F)83 mm (3.3 inches)95%low
February Weather-8°C (17°F)82 mm (3.2 inches)94%moderate
March Weather-3°C (27°F)87 mm (3.4 inches)90%moderate
April Weather4°C (40°F)115 mm (4.5 inches)86%high
May Weather13°C (56°F)92 mm (3.6 inches)77%very high
June Weather18°C (65°F)100 mm (3.9 inches)71%very high
July Weather22°C (71°F)89 mm (3.5 inches)79%very high
August Weather20°C (69°F)103 mm (4.1 inches)78%very high
September Weather15°C (60°F)64 mm (2.5 inches)78%high
October Weather9°C (48°F)122 mm (4.8 inches)87%moderate
November Weather0°C (33°F)115 mm (4.5 inches)90%moderate
December Weather-7°C (20°F)95 mm (3.7 inches)93%low

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