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Weather in Dartmouth for September 2025

Your guide to Dartmouth weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Dartmouth is slightly cooler than the historical average by -1.3 °C.

  • Expect cooler weather in the next days in Dartmouth with the forecast suggesting a temperature of 18.6 °C, lower than the historical average.

  • In general, the average temperature in Dartmouth at the beginning of September is 20.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.4 °C by the end of September.

    • Rain 🌧️

  • The climate of Dartmouth in September is notably wet, with an average of 12 rainy days, and a total of 129.3 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
18
Dry days
Average rainy days
12
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/12°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
81 %
Avg humidity

Dartmouth Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Mist
21°
2
Sunny
20°
3
Overcast
19°
4
Fog
21°
5
Overcast
22°
6
Overcast
20°
7
Fog
22°
8
Fog
22°
9
Fog
21°
10
Light rain
20°
11
Light rain shower
22°
12
Fog
20°
13
Fog
20°
14
Partly cloudy
21°
15
Overcast
22°
16
Mist
20°
17
Partly cloudy
24°
18
Sunny
21°
19
Patchy rain possible
22°
20
Sunny
14°
21
Sunny
20°
22
Sunny
23°
23
Partly cloudy
21°
24
Moderate rain
16°
25
Patchy rain possible
15°
26
Patchy rain possible
12°
27
Moderate rain
9°
28
Fog
19°
29
Fog
18°
30
Fog
19°

Temperatures trend during September in Dartmouth

See the weather trend as well as the moving average line

September weather in Dartmouth day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Mist
Mist
 21° /12° 0 mm 5
2 Sept. Sunny
Sunny
 20° /12° 10.1 mm 5
3 Sept. Overcast
Overcast
 19° /12° 0 mm 5
4 Sept. Fog
Fog
 21° /11° 0 mm 5
5 Sept. Overcast
Overcast
 22° /14° 0 mm 5
6 Sept. Overcast
Overcast
 20° /15° 2.5 mm 4
7 Sept. Fog
Fog
 22° /17° 34.5 mm 5
8 Sept. Fog
Fog
 22° /15° 9.9 mm 5
9 Sept. Fog
Fog
 21° /13° 0 mm 5
10 Sept. Light rain
Light rain
 20° /13° 2.4 mm 4
11 Sept. Light rain shower
Light rain shower
 22° /13° 3.5 mm 5
12 Sept. Fog
Fog
 20° /12° 0 mm 6
13 Sept. Fog
Fog
 20° /12° 0 mm 5
14 Sept. Partly cloudy
Partly cloudy
 21° /14° 0 mm 1.3
15 Sept. Overcast
Overcast
 22° /14° 0 mm 1.3
16 Sept. Mist
Mist
 20° /11° 0 mm 1.3
17 Sept. Partly cloudy
Partly cloudy
 24° /12° 0 mm 1.3
18 Sept. Sunny
Sunny
 21° /12° 0 mm 0.1
19 Sept. Patchy rain possible
Patchy rain possible
 22° /11° 2.3 mm 4
20 Sept. Sunny
Sunny
 14° /8° 0 mm 4
21 Sept. Sunny
Sunny
 20° /7° 0 mm 4
22 Sept. Sunny
Sunny
 23° /11° 0 mm 5
23 Sept. Partly cloudy
Partly cloudy
 21° /12° 0 mm 5
24 Sept. Moderate rain
Moderate rain
 16° /10° 5.8 mm 3
25 Sept. Patchy rain possible
Patchy rain possible
 15° /12° 2.4 mm 3
26 Sept. Patchy rain possible
Patchy rain possible
 12° /8° 0.1 mm 3
27 Sept. Moderate rain
Moderate rain
 9° /3° 9.1 mm 2
28 Sept. Fog
Fog
 19° /11° 0 mm 5
29 Sept. Fog
Fog
 18° /9° 0 mm 4
30 Sept. Fog
Fog
 19° /9° 0 mm 4
Next
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.
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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 129.3 mm is expected in Dartmouth during September, occurring over more than 12 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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Get accurate weather forecasts for Dartmouth, located at latitude 44.671 and longitude -63.577. Stay updated with localized weather information tailored for Dartmouth.

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