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September Weather in Mercier, Canada

Last updated: June 18, 2025

In September, the average temperature in Mercier, Canada hovers around 17°C (62°F). Expect a range from a chilly 2°C (35°F) to a warm 32°C (89°F), so dress accordingly! Precipitation during this month averages 70 mm (2.7 in) over about 9 days, with a cozy average humidity of 78%. Stay prepared for a mix of weather!

September Temperature in Mercier

In September in Mercier, the average temperature is 17°C (62°F). The maximum can reach 32°C (89°F) and the minimum can be as low as 2°C (35°F). Be sure to pack layers to comfortably enjoy the fluctuating temperatures during your travels!

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

The chart illustrates September temperature patterns in Mercier, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mercier, September typically has an average temperature of 17°C (62°F), with highs reaching up to 32°C (89°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec192129435666727062513625
Data source: Temperature data for Mercier 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 Mercier

In Mercier in September, the precipitation amount is 70 mm (2.7 in) over the course of 9 days.

September Precipitation Trends in Mercier

The chart displays monthly precipitation patterns in Mercier, 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 Mercier, September typically receives around 70 mm (2.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec838384117971051021047013511284
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mercier

In Mercier in September, humidity is 78%. With an average temperature of 17°C (62°F), this humidity feels like a warm, enveloping blanket, making travel feel a bit sticky and heavy but also refreshing, as long as you're prepared with light clothing and plenty of water.

September Average Humidity in Mercier

This chart illustrates the average monthly humidity levels in Mercier, 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 Mercier 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 Mercier

In Mercier 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 Mercier.

Maximum UV Index Levels in Mercier for September

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

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

This table compares monthly weather conditions in Mercier, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)83 mm (3.3 inches)93%low
February Weather-6°C (21°F)83 mm (3.3 inches)92%moderate
March Weather-2°C (29°F)84 mm (3.3 inches)86%moderate
April Weather6°C (43°F)117 mm (4.6 inches)85%high
May Weather13°C (57°F)97 mm (3.8 inches)80%very high
June Weather19°C (67°F)105 mm (4.1 inches)74%very high
July Weather22°C (72°F)102 mm (4.0 inches)76%very high
August Weather21°C (71°F)104 mm (4.1 inches)75%very high
September Weather17°C (62°F)70 mm (2.7 inches)78%high
October Weather10°C (51°F)135 mm (5.3 inches)86%moderate
November Weather2°C (36°F)112 mm (4.4 inches)88%moderate
December Weather-4°C (25°F)84 mm (3.3 inches)89%low

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