Weather in Dorchester for September 2026
Until now, September 2026 in Dorchester has been nearly identical to the historical average, with a temperature of 17.9 °C (showing only a slight deviation of 0.2 °C).
Expect cooler weather in the next days in Dorchester with the forecast suggesting a temperature of 21.8 °C, lower than the historical average.
In general, the average temperature in Dorchester at the beginning of September is 18.3 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 23.1 °C by the end of September.
The climate of Dorchester in September is notably wet, with an average of 15 rainy days, and a total of 82.8 mm of precipitation.
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Dorchester Weather September
Temperatures trend during September in Dorchester
September weather in Dorchester day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 17° /15° | 3.8 mm | 3 | |
| 2 Sept. | Light rain shower | 18° /16° | 4 mm | 3 | |
| 3 Sept. | Light rain shower | 18° /17° | 4.5 mm | 3 | |
| 4 Sept. | Light rain shower | 19° /15° | 7.7 mm | 3 | |
| 5 Sept. |  Overcast | 17° /14° | 0 mm | 4 | |
| 6 Sept. | Overcast | 20° /16° | 0.1 mm | 4 | |
| 7 Sept. |  Light drizzle | 19° /16° | 0.7 mm | 3 | |
| 8 Sept. | Patchy rain possible | 17° /14° | 12.4 mm | 4 | |
| 9 Sept. | Light drizzle | 17° /14° | 1.7 mm | 4 | |
| 10 Sept. | Light rain shower | 17° /13° | 2.2 mm | 3 | |
| 11 Sept. | Patchy light drizzle | 17° /14° | 2.7 mm | 3 | |
| 12 Sept. | Light rain shower | 17° /13° | 2.9 mm | 3 | |
| 13 Sept. | Light rain shower | 17° /15° | 4 mm | 3 | |
| 14 Sept. | Light rain shower | 19° /15° | 1.9 mm | 4 | |
| 15 Sept. | Patchy light drizzle | 18° /14° | 0.8 mm | 4 | |
| 16 Sept. | Patchy light drizzle | 17° /13° | 0.4 mm | 4 | |
| 17 Sept. | Patchy rain possible | 18° /14° | 1.8 mm | 3 | |
| 18 Sept. | Patchy rain possible | 17° /15° | 0.2 mm | 3 | |
| 19 Sept. | Patchy rain possible | 18° /16° | 0.7 mm | 3.3 | |
| 20 Sept. | Overcast | 20° /14° | 0.3 mm | 3.8 | |
| 21 Sept. |  Sunny | 22° /13° | 0 mm | 4.1 | |
| 22 Sept. | Sunny | 23° /15° | 0 mm | 6 | |
| 23 Sept. | Overcast | 23° /15° | 0 mm | 6 | |
| 24 Sept. | Sunny | 21° /14° | 0 mm | 5 | |
| 25 Sept. | Sunny | 23° /15° | 0 mm | 6 | |
| 26 Sept. | Sunny | 25° /15° | 0 mm | 6 | |
| 27 Sept. | Sunny | 25° /14° | 0 mm | 6 | |
| 28 Sept. | Sunny | 25° /15° | 0 mm | 6 | |
| 29 Sept. | Sunny | 23° /14° | 0 mm | 6 | |
| 30 Sept. | Overcast | 20° /17° | 7.5 mm | 4 | |
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Dorchester in September - FAQ
What are the expected maximum and minimum temperatures in Dorchester during September?
How much rainfall should be expected in Dorchester during September?
What are the typical wind conditions in Dorchester during September?
September rainfall patterns in Dorchester
UV exposure in Dorchester during September
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