September Weather in McGill, United States

Last updated: June 24, 2025

In September, the average temperature in McGill, United States hovers around 18°C (64°F). Expect a range where the minimum dips to -3°C (28°F) and the maximum peaks at 34°C (93°F). With only 15 mm (0.6 in) of precipitation spread over 2 days, the overall average humidity stands at a comfortable 43%.

September Temperature in McGill

In September in McGill, the average temperature is 18°C (64°F), with maximums reaching up to 34°C (93°F) and minimums dropping as low as -3°C (28°F). Be prepared for a wide range of temperatures when traveling during this time!

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

The chart illustrates September temperature patterns in McGill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In McGill, September typically has an average temperature of 18°C (64°F), with highs reaching up to 34°C (93°F) and lows dropping to around -3°C (28°F).

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

September Precipitation in McGill

In McGill in September, the precipitation amount is 15 mm (0.6 in) over the course of 2 days.

September Precipitation Trends in McGill

The chart displays monthly precipitation patterns in McGill, 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 McGill, September typically receives around 15 mm (0.6 inches) of precipitation spread over approximately 2 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 McGill

In McGill in September, humidity is 43%. With an average temperature of 18°C (64°F), this humidity feels like a comfortable and refreshing breeze, making it ideal for leisurely exploration and outdoor adventures.

September Average Humidity in McGill

This chart illustrates the average monthly humidity levels in McGill, 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 McGill is approximately 43%, 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 McGill

In McGill in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in McGill.

Maximum UV Index Levels in McGill for September

The chart shows the monthly maximum UV Index (UVI) for McGill 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 McGill typically reaches 10, which falls under the very high exposure category.

Data source: McGill 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 McGill Compares to Other Months

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

This table compares monthly weather conditions in McGill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	29 mm (1.2 inches)	82%	moderate
February Weather	-4°C (26°F)	34 mm (1.3 inches)	84%	high
March Weather	1°C (33°F)	59 mm (2.3 inches)	76%	very high
April Weather	6°C (44°F)	41 mm (1.6 inches)	67%	very high
May Weather	12°C (54°F)	45 mm (1.8 inches)	51%	extreme
June Weather	20°C (68°F)	8 mm (0.3 inches)	44%	extreme
July Weather	24°C (76°F)	14 mm (0.6 inches)	36%	extreme
August Weather	23°C (74°F)	10 mm (0.4 inches)	32%	extreme
September Weather	18°C (64°F)	15 mm (0.6 inches)	43%	very high
October Weather	8°C (47°F)	25 mm (1.0 inches)	63%	high
November Weather	3°C (38°F)	21 mm (0.8 inches)	80%	moderate
December Weather	-4°C (26°F)	30 mm (1.2 inches)	83%	moderate