Dartmouth
September
Weather in Dartmouth for September 2025
Your guide to Dartmouth weather in September - trends and predictions
In general, the average temperature in Dartmouth at the beginning of September is 21.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18 °C by the end of September.
Dartmouth sees moderate rainfall in September, averaging 9 rainy days.
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21
Dry days
9
Rainy days
0
Snow days
20°/12°
Temperatures
19 km/h
Avg max wind
84 %
Avg humidity
Dartmouth in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  21° | 2  22° | 3  20° | 4 22° | 5 23° | 6  20° | 7 23° |
| 8 23° | 9 21° | 10  21° | 11 21° | 12 20° | 13 21° | 14  20° |
| 15  20° | 16 21° | 17 23° | 18 21° | 19  21° | 20 18° | 21  18° |
| 22  17° | 23 17° | 24 18° | 25 17° | 26 17° | 27 18° | 28 19° |
| 29 18° | 30 19° |
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Temperatures trend during September in Dartmouth
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Mist | 21° /11° | 0 mm | 5 | |
| 2 Sept. | Sunny | 22° /12° | 2.9 mm | 6 | |
| 3 Sept. | Overcast | 20° /12° | 0 mm | 5 | |
| 4 Sept. | Fog | 22° /11° | 0 mm | 6 | |
| 5 Sept. | Overcast | 23° /13° | 0 mm | 6 | |
| 6 Sept. | Light rain shower | 20° /15° | 3.8 mm | 5 | |
| 7 Sept. | Fog | 23° /16° | 31.1 mm | 6 | |
| 8 Sept. | Fog | 23° /16° | 2.3 mm | 6 | |
| 9 Sept. | Fog | 21° /13° | 0 mm | 5 | |
| 10 Sept. | Light rain | 21° /13° | 3.6 mm | 5 | |
| 11 Sept. | Light rain shower | 21° /12° | 1.5 mm | 5 | |
| 12 Sept. | Fog | 20° /13° | 0 mm | 6 | |
| 13 Sept. | Fog | 21° /14° | 0 mm | 6 | |
| 14 Sept. | Moderate or heavy rain shower | 20° /13° | 15.4 mm | 5 | |
| 15 Sept. | Moderate rain | 20° /11° | 4.8 mm | 5 | |
| 16 Sept. | Light rain shower | 21° /13° | 21.3 mm | 5 | |
| 17 Sept. | Overcast | 23° /14° | 4.2 mm | 5 | |
| 18 Sept. | Overcast | 21° /13° | 0 mm | 5 | |
| 19 Sept. | Heavy rain | 21° /14° | 20.5 mm | 5 | |
| 20 Sept. | Patchy rain possible | 18° /14° | 0.1 mm | 4 | |
| 21 Sept. | Cloudy | 18° /10° | 0 mm | 4 | |
| 22 Sept. | Partly cloudy | 17° /9° | 0 mm | 5 | |
| 23 Sept. | Overcast | 17° /9° | 0 mm | 4 | |
| 24 Sept. | Mist | 18° /10° | 0 mm | 4 | |
| 25 Sept. | Patchy rain possible | 17° /11° | 0 mm | 4 | |
| 26 Sept. | Partly cloudy | 17° /8° | 0 mm | 5 | |
| 27 Sept. | Mist | 18° /10° | 17.7 mm | 4 | |
| 28 Sept. | Fog | 19° /11° | 0 mm | 5 | |
| 29 Sept. | Fog | 18° /9° | 0 mm | 4 | |
| 30 Sept. | Fog | 19° /9° | 0 mm | 4 | |
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Important Notice
Our weather forecast for Dartmouth in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Dartmouth forecast closer to your planned date for the most up-to-date weather information.
Dartmouth in September - FAQ
What are the expected maximum and minimum temperatures in Dartmouth during September?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Dartmouth during September?
Significant rainfall exceeding 144.5 mm is expected in Dartmouth during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Dartmouth during September?
The average wind speed in Dartmouth during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Dartmouth
Explore the daily rainfall trends and prepare for Dartmouths September weather 💧
UV exposure in Dartmouth during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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