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September Weather in Trois-Rivieres, Canada

Last updated: June 18, 2025

The average temperature in Trois-Rivieres, Canada during September hovers around 16°C (61°F). Expect a minimum of 1°C (34°F) and a maximum of 30°C (87°F). You'll also experience 69 mm (2.7 in) of precipitation over approximately 9 days, with an average humidity level of 78%.

September Temperature in Trois-Rivieres

In September in Trois-Rivieres, the average temperature is 16°C (61°F). Maximum temperatures can reach as high as 30°C (87°F), while the minimum can dip down to 1°C (34°F). Pack accordingly to enjoy the diverse weather and stay comfortable during your travels!

September Weather in Trois-Rivieres: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Trois-Rivieres, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trois-Rivieres, September typically has an average temperature of 16°C (61°F), with highs reaching up to 30°C (87°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec151827415665716961493321
Data source: Temperature data for Trois-Rivieres 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 Trois-Rivieres

In Trois-Rivieres in September, the precipitation amount is 69 mm (2.7 in) spread over 9 days.

September Precipitation Trends in Trois-Rivieres

The chart displays monthly precipitation patterns in Trois-Rivieres, 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 Trois-Rivieres, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec858190117102109981176912712095
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Trois-Rivieres

In Trois-Rivieres in September, humidity is 78%. With an average temperature of 16°C (61°F), this humidity feels like a warm, sticky embrace, making travel somewhat uncomfortable as it clings to your skin and creates a heavy atmosphere that can drain your energy.

September Average Humidity in Trois-Rivieres

This chart illustrates the average monthly humidity levels in Trois-Rivieres, 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 Trois-Rivieres 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 Trois-Rivieres

In Trois-Rivieres 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 Trois-Rivieres.

Maximum UV Index Levels in Trois-Rivieres for September

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

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

This table compares monthly weather conditions in Trois-Rivieres, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)85 mm (3.3 inches)95%low
February Weather-8°C (18°F)81 mm (3.2 inches)94%moderate
March Weather-3°C (27°F)90 mm (3.5 inches)90%moderate
April Weather5°C (41°F)117 mm (4.6 inches)86%high
May Weather13°C (56°F)102 mm (4.0 inches)77%very high
June Weather18°C (65°F)109 mm (4.3 inches)71%very high
July Weather22°C (71°F)98 mm (3.9 inches)79%very high
August Weather21°C (69°F)117 mm (4.6 inches)78%very high
September Weather16°C (61°F)69 mm (2.7 inches)78%high
October Weather9°C (49°F)127 mm (5.0 inches)87%moderate
November Weather1°C (33°F)120 mm (4.7 inches)90%moderate
December Weather-6°C (21°F)95 mm (3.7 inches)93%low

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