Last updated: June 18, 2025
In September, the average temperature in Windsor, Canada hovers around 15°C (59°F). Be prepared for some temperature swings, with a minimum of -3°C (26°F) and a maximum soaring to 30°C (87°F). During this month, expect about 78 mm (3.1 in) of precipitation spread over 10 days, and with an average humidity of 77%, it’s a time to embrace both the warmth and occasional rain!
In September in Windsor, the average temperature is 15°C (59°F). Maximum temperatures can reach 30°C (87°F) and minimum temperatures can be as low as -3°C (26°F). This variation makes it essential to pack layers for your trip, ensuring you're prepared for both warm days and cooler nights.
In Windsor in September, the precipitation amount is 78 mm (3.1 in) over the course of 10 days.
In Windsor in September, humidity is 77%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket enveloping you, making it essential to stay hydrated and choose light, breathable clothing for comfortable travel.
In Windsor 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 Windsor.
UV Risk Categories
Weather in Windsor varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Windsor, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (17°F) | 86 mm (3.4 inches) | 91% | low |
| February Weather | -7°C (20°F) | 82 mm (3.2 inches) | 89% | moderate |
| March Weather | -2°C (28°F) | 82 mm (3.2 inches) | 85% | moderate |
| April Weather | 5°C (42°F) | 115 mm (4.5 inches) | 84% | high |
| May Weather | 12°C (55°F) | 105 mm (4.1 inches) | 78% | very high |
| June Weather | 17°C (63°F) | 130 mm (5.1 inches) | 72% | very high |
| July Weather | 20°C (68°F) | 120 mm (4.7 inches) | 75% | very high |
| August Weather | 19°C (67°F) | 123 mm (4.8 inches) | 74% | very high |
| September Weather | 15°C (59°F) | 78 mm (3.1 inches) | 77% | high |
| October Weather | 9°C (48°F) | 138 mm (5.4 inches) | 85% | moderate |
| November Weather | 1°C (33°F) | 115 mm (4.5 inches) | 86% | moderate |
| December Weather | -5°C (23°F) | 83 mm (3.3 inches) | 85% | low |