September Weather in Orillia, Canada

Last updated: June 18, 2025

In September, the average temperature in Orillia, Canada hovers around 16°C (61°F), with minimums dipping to 2°C (36°F) and maximums soaring to 32°C (89°F). Expect 86 mm (3.4 in) of precipitation spread over 11 days, contributing to an average humidity of 74%. This mix of warmth and moisture sets a unique atmosphere for your visit.

September Temperature in Orillia

In September in Orillia, the average temperature is 16°C (61°F). Maximum temperatures can reach 32°C (89°F), while the minimum can drop as low as 2°C (36°F). Be prepared for a variety of weather conditions when planning your travels!

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

The chart illustrates September temperature patterns in Orillia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Orillia, September typically has an average temperature of 16°C (61°F), with highs reaching up to 32°C (89°F) and lows dropping to around 2°C (36°F).

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

September Precipitation in Orillia

In Orillia in September, the precipitation amount is 86 mm (3.4 in), spread over 11 days.

September Precipitation Trends in Orillia

The chart displays monthly precipitation patterns in Orillia, 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 Orillia, September typically receives around 86 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 Orillia

In Orillia 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 Orillia

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

In Orillia 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 Orillia.

Maximum UV Index Levels in Orillia for September

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

Data source: Orillia 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 Orillia Compares to Other Months

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

This table compares monthly weather conditions in Orillia, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	64 mm (2.5 inches)	93%	low
February Weather	-6°C (22°F)	70 mm (2.7 inches)	94%	moderate
March Weather	-2°C (29°F)	66 mm (2.6 inches)	87%	moderate
April Weather	5°C (41°F)	110 mm (4.3 inches)	82%	very high
May Weather	13°C (55°F)	94 mm (3.7 inches)	74%	very high
June Weather	18°C (65°F)	103 mm (4.1 inches)	68%	very high
July Weather	21°C (71°F)	109 mm (4.3 inches)	67%	very high
August Weather	20°C (69°F)	122 mm (4.8 inches)	67%	very high
September Weather	16°C (61°F)	86 mm (3.4 inches)	74%	high
October Weather	10°C (50°F)	113 mm (4.4 inches)	83%	moderate
November Weather	2°C (36°F)	88 mm (3.5 inches)	89%	moderate
December Weather	-3°C (26°F)	81 mm (3.2 inches)	91%	low