September Weather in Newmarket, Canada

Last updated: June 18, 2025

In Newmarket, Canada, the average temperature in September hovers around 16°C (62°F). Expect a range from a chilly 1°C (35°F) to a warm 33°C (91°F). During this month, you can anticipate about 64 mm (2.5 in) of precipitation over approximately 9 days, with an average humidity level of 76%. Stay prepared for a mix of weather as you enjoy your time here!

September Temperature in Newmarket

In September in Newmarket, the average temperature is 16°C (62°F), with maximums reaching up to 33°C (91°F) and minimums dropping as low as 1°C (35°F). Be sure to pack for a wide range of temperatures to enjoy your trip fully.

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

The chart illustrates September temperature patterns in Newmarket, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Newmarket, September typically has an average temperature of 16°C (62°F), with highs reaching up to 33°C (91°F) and lows dropping to around 1°C (35°F).

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

September Precipitation in Newmarket

In Newmarket in September, the precipitation amount is 64 mm (2.5 in) over a span of 9 days.

September Precipitation Trends in Newmarket

The chart displays monthly precipitation patterns in Newmarket, 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 Newmarket, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 9 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 Newmarket

In Newmarket in September, humidity is 76%. With an average temperature of 16°C (62°F), this humidity feels like a warm, enveloping blanket that makes exploring the outdoors feel both refreshing and slightly muggy, urging travelers to take breaks often and enjoy the shade.

September Average Humidity in Newmarket

This chart illustrates the average monthly humidity levels in Newmarket, 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 Newmarket is approximately 76%, 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 Newmarket

In Newmarket 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 Newmarket.

Maximum UV Index Levels in Newmarket for September

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

Data source: Newmarket 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 Newmarket Compares to Other Months

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

This table compares monthly weather conditions in Newmarket, 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 (22°F)	60 mm (2.4 inches)	91%	low
February Weather	-5°C (23°F)	61 mm (2.4 inches)	91%	moderate
March Weather	0°C (32°F)	60 mm (2.4 inches)	88%	moderate
April Weather	6°C (42°F)	103 mm (4.1 inches)	88%	very high
May Weather	13°C (56°F)	99 mm (3.9 inches)	82%	very high
June Weather	19°C (66°F)	94 mm (3.7 inches)	79%	very high
July Weather	22°C (72°F)	98 mm (3.9 inches)	77%	very high
August Weather	21°C (69°F)	97 mm (3.8 inches)	72%	very high
September Weather	16°C (62°F)	64 mm (2.5 inches)	76%	high
October Weather	10°C (50°F)	100 mm (3.9 inches)	83%	moderate
November Weather	2°C (36°F)	74 mm (2.9 inches)	88%	moderate
December Weather	-2°C (28°F)	67 mm (2.6 inches)	87%	low