September Weather in Barrie, Canada

Last updated: June 18, 2025

In September, the average temperature in Barrie, Canada is a comfortable 16°C (61°F). However, temperatures can vary significantly, with minimums dropping to 2°C (36°F) and maximums soaring to 32°C (90°F). Expect some rain during your visit, as 85 mm (3.4 in) of precipitation typically falls over 11 days. Notably, the average humidity sits at a robust 74%, adding a touch of mugginess to the air.

September Temperature in Barrie

In September in Barrie, the average temperature is 16°C (61°F). Maximums can reach 32°C (90°F), while minimums can drop as low as 2°C (36°F). This diverse temperature range makes it essential for travelers to pack both light clothing for daytime excursions and warmer layers for cooler evenings.

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

The chart illustrates September temperature patterns in Barrie, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Barrie, September typically has an average temperature of 16°C (61°F), with highs reaching up to 32°C (90°F) and lows dropping to around 2°C (36°F).

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

September Precipitation in Barrie

In Barrie in September, the precipitation amount is 85 mm (3.4 in) over the course of 11 days.

September Precipitation Trends in Barrie

The chart displays monthly precipitation patterns in Barrie, 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 Barrie, September typically receives around 85 mm (3.4 inches) of precipitation spread over approximately 11 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Barrie

In Barrie in September humidity is 74%. With an average temperature of 16°C (61°F), this humidity feels like a damp blanket wrapping around you, making traveling quite uncomfortable as the air feels thick and muggy, potentially leading to fatigue and a longing for a cool breeze.

September Average Humidity in Barrie

This chart illustrates the average monthly humidity levels in Barrie, 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 Barrie is approximately 74%, 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 Barrie

In Barrie 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 Barrie.

Maximum UV Index Levels in Barrie for September

The chart shows the monthly maximum UV Index (UVI) for Barrie 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 Barrie typically reaches 7, which falls under the high exposure category.

Data source: Barrie 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 Barrie Compares to Other Months

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

This table compares monthly weather conditions in Barrie, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	62 mm (2.5 inches)	93%	low
February Weather	-5°C (23°F)	68 mm (2.7 inches)	94%	moderate
March Weather	-1°C (30°F)	63 mm (2.5 inches)	87%	moderate
April Weather	5°C (41°F)	107 mm (4.2 inches)	82%	very high
May Weather	12°C (55°F)	90 mm (3.5 inches)	74%	very high
June Weather	18°C (65°F)	100 mm (3.9 inches)	68%	very high
July Weather	21°C (70°F)	98 mm (3.9 inches)	67%	very high
August Weather	20°C (69°F)	115 mm (4.5 inches)	67%	very high
September Weather	16°C (61°F)	85 mm (3.4 inches)	74%	high
October Weather	10°C (50°F)	104 mm (4.1 inches)	83%	moderate
November Weather	2°C (36°F)	87 mm (3.4 inches)	89%	moderate
December Weather	-3°C (27°F)	79 mm (3.1 inches)	91%	low