Last updated: June 24, 2025
In September, the average temperature in Sudbury, United States hovers around 19°C (66°F). While you'll enjoy pleasant days, be prepared for temperature variations; it can dip to a cool 3°C (38°F) or rise to a warm 35°C (95°F). Rain is a possibility, with 79 mm (3.1 in) of precipitation spread over 8 days. Don't forget to account for the average humidity at 71%, which may add a slight stickiness to the air!
In September in Sudbury, the average temperature is 19°C (66°F). The maximum can reach 35°C (95°F), while the minimum can drop as low as 3°C (38°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.
In Sudbury in September, the precipitation amount is 79 mm (3.1 in) during 8 days, indicating a relatively wet period for the area.
In Sudbury in September humidity is 71%. With an average temperature of 19°C (66°F), this humidity feels like a warm, balmy embrace that enhances the tropical atmosphere, making it a perfect backdrop for leisurely strolls and outdoor adventures, though it may also lead to a slightly sticky feeling as you explore.
In Sudbury 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 Sudbury.
UV Risk Categories
Weather in Sudbury varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sudbury, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (30°F) | 69 mm (2.7 inches) | 86% | moderate |
| February Weather | 0°C (32°F) | 85 mm (3.3 inches) | 84% | moderate |
| March Weather | 3°C (38°F) | 86 mm (3.4 inches) | 82% | high |
| April Weather | 9°C (48°F) | 124 mm (4.9 inches) | 80% | very high |
| May Weather | 15°C (59°F) | 86 mm (3.4 inches) | 72% | very high |
| June Weather | 20°C (69°F) | 85 mm (3.4 inches) | 72% | very high |
| July Weather | 23°C (74°F) | 133 mm (5.3 inches) | 67% | very high |
| August Weather | 23°C (73°F) | 85 mm (3.4 inches) | 66% | very high |
| September Weather | 19°C (66°F) | 79 mm (3.1 inches) | 71% | high |
| October Weather | 13°C (55°F) | 132 mm (5.2 inches) | 78% | high |
| November Weather | 5°C (42°F) | 97 mm (3.8 inches) | 84% | moderate |
| December Weather | 0°C (33°F) | 118 mm (4.6 inches) | 81% | low |