September Weather in South River, Canada

Last updated: June 18, 2025

In September, the average temperature in South River, Canada is a comfortable 14°C (57°F). Be prepared for a range of temperatures, with minimums dipping to -2°C (29°F) and maximums soaring up to 31°C (87°F). Expect about 133 mm (5.2 in) of precipitation spread over 12 days, accompanied by an average humidity of 74%.

September Temperature in South River

In September in South River, the average temperature is 14°C (57°F), with maximums reaching up to 31°C (87°F) and minimums plummeting to as low as -2°C (29°F). It's advisable to pack for a range of weather conditions to ensure a comfortable trip.

September Weather in South River: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South River, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South River, September typically has an average temperature of 14°C (57°F), with highs reaching up to 31°C (87°F) and lows dropping to around -2°C (29°F).

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

September Precipitation in South River

In South River in September, the precipitation amount is 133 mm (5.2 in) spread over 12 days.

September Precipitation Trends in South River

The chart displays monthly precipitation patterns in South River, 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 South River, September typically receives around 133 mm (5.2 inches) of precipitation spread over approximately 12 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 South River

In South River in September, humidity is 74%. With an average temperature of 14°C (57°F), this humidity feels like a warm, damp blanket wrapping around you, making it slightly uncomfortable for traveling, as you may find yourself quickly sweating and in need of frequent breaks to cool down.

September Average Humidity in South River

This chart illustrates the average monthly humidity levels in South River, 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 South River 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 South River

In South River 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 South River.

Maximum UV Index Levels in South River for September

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

Data source: South River 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 South River Compares to Other Months

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

This table compares monthly weather conditions in South River, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (15°F)	65 mm (2.6 inches)	93%	low
February Weather	-9°C (17°F)	78 mm (3.1 inches)	94%	moderate
March Weather	-4°C (25°F)	63 mm (2.5 inches)	87%	moderate
April Weather	4°C (39°F)	107 mm (4.2 inches)	82%	high
May Weather	11°C (53°F)	106 mm (4.2 inches)	74%	very high
June Weather	16°C (62°F)	126 mm (5.0 inches)	68%	very high
July Weather	20°C (68°F)	108 mm (4.3 inches)	67%	very high
August Weather	18°C (65°F)	133 mm (5.3 inches)	67%	very high
September Weather	14°C (57°F)	133 mm (5.2 inches)	74%	high
October Weather	8°C (46°F)	116 mm (4.5 inches)	83%	moderate
November Weather	-1°C (31°F)	100 mm (4.0 inches)	89%	moderate
December Weather	-6°C (21°F)	86 mm (3.4 inches)	91%	low