Last updated: June 18, 2025
The average temperature in Renfrew, Canada during September is a pleasant 15°C (59°F). However, be prepared for a wide range, as temperatures can dip to a chilly -1°C (31°F) or soar to a sizzling 33°C (91°F). Rain is also a possibility, with 66 mm (2.6 in) expected over 10 days, contributing to an average humidity level of 72%.
In September in Renfrew, the average temperature is 15°C (59°F). Maximums can reach 33°C (91°F) and minimums can be as low as -1°C (31°F). This fluctuating climate makes Renfrew a destination suitable for travelers seeking both warm and cool weather experiences.
In Renfrew in September, the precipitation amount is 66 mm (2.6 in) over the course of 10 days.
In Renfrew in September humidity is 72%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket wrapping around you, creating a sultry atmosphere that can make traveling a bit uncomfortable. The stickiness in the air can leave you feeling sluggish, so it’s advisable to stay hydrated and take breaks often while exploring.
In Renfrew 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 Renfrew.
UV Risk Categories
Weather in Renfrew varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Renfrew, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -9°C (16°F) | 68 mm (2.7 inches) | 93% | low |
| February Weather | -8°C (18°F) | 70 mm (2.8 inches) | 93% | moderate |
| March Weather | -3°C (27°F) | 74 mm (2.9 inches) | 86% | moderate |
| April Weather | 5°C (41°F) | 109 mm (4.3 inches) | 82% | very high |
| May Weather | 12°C (55°F) | 111 mm (4.4 inches) | 75% | very high |
| June Weather | 18°C (64°F) | 92 mm (3.6 inches) | 68% | very high |
| July Weather | 21°C (70°F) | 99 mm (3.9 inches) | 69% | very high |
| August Weather | 19°C (67°F) | 110 mm (4.3 inches) | 67% | very high |
| September Weather | 15°C (59°F) | 66 mm (2.6 inches) | 72% | high |
| October Weather | 8°C (48°F) | 110 mm (4.3 inches) | 83% | moderate |
| November Weather | 0°C (32°F) | 82 mm (3.2 inches) | 88% | moderate |
| December Weather | -6°C (22°F) | 73 mm (2.9 inches) | 89% | low |