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September Weather in Saint-Eustache, Canada

Last updated: June 18, 2025

In Saint-Eustache, Canada, the average temperature in September reaches a pleasant 16°C (62°F). However, be prepared for temperature fluctuations, as it can dip to a chilly 2°C (36°F) at night, and soar up to a warm 30°C (87°F) during the day. Additionally, expect an average precipitation of 76 mm (3.0 in) over 9 days, with humidity lingering at around 78%.

September Temperature in Saint-Eustache

In September in Saint-Eustache, the average temperature is 16°C (62°F). The maximum can reach 30°C (87°F), and the minimum can be as low as 2°C (36°F). This weather makes Saint-Eustache an ideal destination for travelers seeking a comfortable climate with a mix of warm and cool days.

September Weather in Saint-Eustache: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint-Eustache, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint-Eustache, September typically has an average temperature of 16°C (62°F), with highs reaching up to 30°C (87°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec171928425666727062503523
Data source: Temperature data for Saint-Eustache 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 Saint-Eustache

In Saint-Eustache in September, the precipitation amount is 76 mm (3.0 in) spread over a period of 9 days.

September Precipitation Trends in Saint-Eustache

The chart displays monthly precipitation patterns in Saint-Eustache, 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 Saint-Eustache, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec868888120101102981017613311490
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint-Eustache

In Saint-Eustache in September, humidity is 78%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities enjoyable yet slightly sticky. Travelers may find the weather pleasantly mild, though they'll appreciate having light, breathable clothing on hand to stay comfortable while exploring.

September Average Humidity in Saint-Eustache

This chart illustrates the average monthly humidity levels in Saint-Eustache, 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 Saint-Eustache is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint-Eustache

In Saint-Eustache 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 Saint-Eustache.

Maximum UV Index Levels in Saint-Eustache for September

The chart shows the monthly maximum UV Index (UVI) for Saint-Eustache 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 Saint-Eustache typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245799887532
Data source: Saint-Eustache 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 Saint-Eustache Compares to Other Months

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

This table compares monthly weather conditions in Saint-Eustache, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (17°F)86 mm (3.4 inches)93%low
February Weather-7°C (20°F)88 mm (3.5 inches)92%moderate
March Weather-2°C (28°F)88 mm (3.4 inches)86%moderate
April Weather5°C (42°F)119 mm (4.7 inches)85%high
May Weather13°C (56°F)101 mm (4.0 inches)80%very high
June Weather19°C (66°F)102 mm (4.0 inches)74%very high
July Weather22°C (72°F)98 mm (3.9 inches)76%very high
August Weather21°C (70°F)101 mm (4.0 inches)75%very high
September Weather16°C (62°F)76 mm (3.0 inches)78%high
October Weather10°C (50°F)133 mm (5.2 inches)86%moderate
November Weather2°C (35°F)113 mm (4.5 inches)88%moderate
December Weather-5°C (24°F)90 mm (3.5 inches)89%low

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