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September Weather in Saint-Boniface, Canada

Last updated: June 18, 2025

In Saint-Boniface, Canada, the average temperature in September hovers around 14°C (57°F). Be prepared for a variety of weather, as temperatures can dip to a chilly -2°C (29°F) or soar to a warm 31°C (88°F). Expect about 104 mm (4.1 in) of precipitation spread over 12 days, contributing to an average humidity level of 76%.

September Temperature in Saint-Boniface

In September in Saint-Boniface, the average temperature is 14°C (57°F), with maximums reaching 31°C (88°F) and minimums dropping as low as -2°C (29°F). Be prepared for a wide range of temperatures when traveling to Saint-Boniface during this month.

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

The chart illustrates September temperature patterns in Saint-Boniface, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint-Boniface, September typically has an average temperature of 14°C (57°F), with highs reaching up to 31°C (88°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec121424385362686557453118
Data source: Temperature data for Saint-Boniface 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-Boniface

In Saint-Boniface in September, the total precipitation amount is 104 mm (4.1 in) spread over 12 days.

September Precipitation Trends in Saint-Boniface

The chart displays monthly precipitation patterns in Saint-Boniface, 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-Boniface, September typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec6674811071201041131181041158885
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint-Boniface

In Saint-Boniface in September humidity is 76%. With an average temperature of 14°C (57°F), this humidity feels like a warm blanket wrapped around you, creating a heavy atmosphere that can make outdoor activities feel sluggish and stifling, urging travelers to seek shade and refreshment more frequently.

September Average Humidity in Saint-Boniface

This chart illustrates the average monthly humidity levels in Saint-Boniface, 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-Boniface is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec96%95%91%85%76%69%75%73%76%87%91%94%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint-Boniface

In Saint-Boniface 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-Boniface.

Maximum UV Index Levels in Saint-Boniface for September

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

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

This table compares monthly weather conditions in Saint-Boniface, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (13°F)66 mm (2.6 inches)96%low
February Weather-10°C (15°F)74 mm (2.9 inches)95%moderate
March Weather-4°C (24°F)81 mm (3.2 inches)91%moderate
April Weather3°C (38°F)107 mm (4.2 inches)85%high
May Weather11°C (53°F)120 mm (4.7 inches)76%very high
June Weather16°C (62°F)104 mm (4.1 inches)69%very high
July Weather20°C (68°F)113 mm (4.4 inches)75%very high
August Weather18°C (65°F)117 mm (4.6 inches)73%very high
September Weather14°C (57°F)104 mm (4.1 inches)76%high
October Weather7°C (46°F)115 mm (4.5 inches)87%moderate
November Weather-1°C (31°F)87 mm (3.4 inches)91%moderate
December Weather-8°C (19°F)85 mm (3.3 inches)94%low

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