Last updated: June 18, 2025
In September, the average temperature in Dorchester, Canada is a comfortable 17°C (63°F), with a minimum dropping to 1°C (34°F) and a maximum reaching up to 32°C (89°F). Be prepared for some precipitation, as the region typically experiences around 83 mm (3.2 in) of rain over 11 days. With an average humidity of 81%, it's a month where you can appreciate the balmy atmosphere, but don't forget your umbrella!
In September in Dorchester, the average temperature is 17°C (63°F). Maximum temperatures can reach 32°C (89°F), while minimum temperatures can drop as low as 1°C (34°F). This makes Dorchester an ideal destination for travelers seeking a range of weather experiences, from warm days to cooler evenings.
In Dorchester in September, the precipitation amount is 83 mm (3.2 in), occurring over the course of 11 days.
In Dorchester in September humidity is 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.
In Dorchester in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Dorchester.
UV Risk Categories
Weather in Dorchester varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Dorchester, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 76 mm (3.0 inches) | 90% | low |
| February Weather | -3°C (26°F) | 79 mm (3.1 inches) | 90% | moderate |
| March Weather | 1°C (34°F) | 78 mm (3.1 inches) | 87% | moderate |
| April Weather | 6°C (44°F) | 109 mm (4.3 inches) | 87% | very high |
| May Weather | 14°C (57°F) | 102 mm (4.0 inches) | 82% | very high |
| June Weather | 19°C (67°F) | 104 mm (4.1 inches) | 81% | very high |
| July Weather | 22°C (72°F) | 95 mm (3.7 inches) | 79% | very high |
| August Weather | 21°C (70°F) | 96 mm (3.8 inches) | 80% | very high |
| September Weather | 17°C (63°F) | 83 mm (3.2 inches) | 81% | very high |
| October Weather | 11°C (52°F) | 120 mm (4.7 inches) | 84% | moderate |
| November Weather | 3°C (38°F) | 87 mm (3.4 inches) | 88% | moderate |
| December Weather | -1°C (31°F) | 74 mm (2.9 inches) | 87% | low |