September Weather in Winnipeg, Canada

Last updated: June 18, 2025

In Winnipeg, Canada, the average temperature in September hovers around 13°C (57°F), presenting a mild climate. Temperatures can vary significantly, with minimums dipping to -4°C (26°F) and maximums soaring to 34°C (93°F). Expect 97 mm (3.8 in) of precipitation over approximately 10 days, accompanied by a notable humidity level of 75%.

September Temperature in Winnipeg

In September in Winnipeg, the average temperature is 13°C (57°F). Maximum temperatures can reach 34°C (93°F), while minimums can drop as low as -4°C (26°F). Be prepared for a wide range of temperatures when traveling during this month.

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

The chart illustrates September temperature patterns in Winnipeg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Winnipeg, September typically has an average temperature of 13°C (57°F), with highs reaching up to 34°C (93°F) and lows dropping to around -4°C (26°F).

Data source: Temperature data for Winnipeg generated using information from the Copernicus Climate Change Service.

September Precipitation in Winnipeg

In Winnipeg in September, the total precipitation amount is 97 mm (3.8 in) over a span of 10 days.

September Precipitation Trends in Winnipeg

The chart displays monthly precipitation patterns in Winnipeg, 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 Winnipeg, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Winnipeg

In Winnipeg in September humidity is 75%. With average temperature 13°C (57°F), this humidity feels like a damp chill, making it essential for travelers to dress in layers and be prepared for a slightly uncomfortable experience while exploring the area.

September Average Humidity in Winnipeg

This chart illustrates the average monthly humidity levels in Winnipeg, 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 Winnipeg is approximately 75%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Winnipeg

In Winnipeg in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Winnipeg, you can refer to this Hourly UV Index in Winnipeg.

Maximum UV Index Levels in Winnipeg for September

The chart shows the monthly maximum UV Index (UVI) for Winnipeg 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 Winnipeg typically reaches 6, which falls under the high exposure category.

Data source: Winnipeg 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 Winnipeg Compares to Other Months

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

This table compares monthly weather conditions in Winnipeg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-14°C (6°F)	18 mm (0.7 inches)	94%	low
February Weather	-16°C (4°F)	15 mm (0.6 inches)	91%	moderate
March Weather	-5°C (23°F)	18 mm (0.7 inches)	90%	moderate
April Weather	2°C (36°F)	29 mm (1.1 inches)	81%	high
May Weather	12°C (54°F)	35 mm (1.4 inches)	74%	very high
June Weather	19°C (66°F)	76 mm (3.0 inches)	75%	very high
July Weather	21°C (70°F)	61 mm (2.4 inches)	74%	very high
August Weather	19°C (67°F)	60 mm (2.4 inches)	77%	very high
September Weather	13°C (57°F)	97 mm (3.8 inches)	75%	high
October Weather	5°C (41°F)	57 mm (2.3 inches)	78%	moderate
November Weather	-5°C (24°F)	27 mm (1.1 inches)	87%	low
December Weather	-11°C (13°F)	24 mm (0.9 inches)	93%	low