Last updated: June 18, 2025
In Ajax, Canada, the average temperature in September is a pleasant 18°C (65°F). Expect a minimum of 9°C (49°F) and a maximum of 27°C (81°F), making it a month with mild variations. During this time, precipitation reaches approximately 73 mm (2.9 in) over 9 days, contributing to an average humidity of 76%. Perfect weather for exploring!
In September in Ajax, the average temperature is 18°C (65°F). The maximum can reach 27°C (81°F), while the minimum can drop as low as 9°C (49°F). This pleasant climate makes Ajax an ideal destination for outdoor activities and sightseeing.
In Ajax in September, the precipitation amount is 73 mm (2.9 in), occurring over the course of 9 days.
In Ajax in September, humidity is 76%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making travel a little sticky but enjoyable, as long as you stay hydrated and take breaks in the shade.
In Ajax 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 Ajax.
UV Risk Categories
Weather in Ajax varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ajax, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -3°C (28°F) | 84 mm (3.3 inches) | 91% | low |
February Weather | -2°C (28°F) | 88 mm (3.5 inches) | 91% | moderate |
March Weather | 1°C (33°F) | 77 mm (3.0 inches) | 88% | moderate |
April Weather | 5°C (41°F) | 122 mm (4.8 inches) | 88% | very high |
May Weather | 9°C (49°F) | 105 mm (4.1 inches) | 82% | very high |
June Weather | 16°C (60°F) | 77 mm (3.0 inches) | 79% | very high |
July Weather | 21°C (70°F) | 70 mm (2.7 inches) | 77% | very high |
August Weather | 22°C (71°F) | 78 mm (3.1 inches) | 72% | very high |
September Weather | 18°C (65°F) | 73 mm (2.9 inches) | 76% | high |
October Weather | 13°C (55°F) | 118 mm (4.6 inches) | 83% | moderate |
November Weather | 5°C (41°F) | 102 mm (4.0 inches) | 88% | moderate |
December Weather | 1°C (33°F) | 96 mm (3.8 inches) | 87% | low |