New Brunswick (Moncton)
September
Weather in New Brunswick for September 2025
Your guide to New Brunswick weather in September - trends and predictions
In general, the average temperature in New Brunswick at the beginning of September is 22.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.9 °C by the end of September.
The climate of New Brunswick in September is notably wet, with an average of 11 rainy days.
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19
Dry days
11
Rainy days
0
Snow days
21°/11°
Temperatures
15 km/h
Avg max wind
82 %
Avg humidity
New Brunswick in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  20° | 2  23° | 3 21° | 4  25° | 5 24° | 6  22° | 7 20° |
| 8 24° | 9  21° | 10 20° | 11 19° | 12 21° | 13 23° | 14 20° |
| 15 21° | 16 24° | 17 25° | 18 24° | 19  19° | 20 18° | 21 15° |
| 22 17° | 23 16° | 24  18° | 25 15° | 26 18° | 27 17° | 28 18° |
| 29 20° | 30 19° |
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Temperatures trend during September in New Brunswick
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. | Sunny | 20° /11° | 4.5 mm | 5 | |
| 2 Sept. | Partly cloudy | 23° /11° | 0.4 mm | 6 | |
| 3 Sept. | Partly cloudy | 21° /10° | 0 mm | 6 | |
| 4 Sept. | Fog | 25° /11° | 0 mm | 6 | |
| 5 Sept. | Mist | 24° /13° | 0 mm | 6 | |
| 6 Sept. | Overcast | 22° /13° | 0.5 mm | 5 | |
| 7 Sept. | Fog | 20° /14° | 6.7 mm | 5 | |
| 8 Sept. | Mist | 24° /13° | 1.1 mm | 6 | |
| 9 Sept. | Light rain shower | 21° /13° | 1.8 mm | 5 | |
| 10 Sept. | Light rain shower | 20° /10° | 2.3 mm | 5 | |
| 11 Sept. | Light rain shower | 19° /10° | 16.4 mm | 5 | |
| 12 Sept. | Fog | 21° /11° | 0 mm | 5 | |
| 13 Sept. | Fog | 23° /14° | 1.1 mm | 5 | |
| 14 Sept. | Fog | 20° /13° | 1.5 mm | 5 | |
| 15 Sept. | Mist | 21° /8° | 0 mm | 5 | |
| 16 Sept. | Light rain shower | 24° /13° | 26.1 mm | 6 | |
| 17 Sept. | Light rain shower | 25° /14° | 3.3 mm | 6 | |
| 18 Sept. | Patchy rain possible | 24° /14° | 0.6 mm | 6 | |
| 19 Sept. | Light rain | 19° /14° | 0.9 mm | 4 | |
| 20 Sept. | Patchy rain possible | 18° /12° | 0.4 mm | 4 | |
| 21 Sept. | Patchy rain possible | 15° /9° | 0.1 mm | 4 | |
| 22 Sept. | Partly cloudy | 17° /7° | 0 mm | 5 | |
| 23 Sept. | Overcast | 16° /9° | 0 mm | 4 | |
| 24 Sept. | Cloudy | 18° /9° | 0 mm | 5 | |
| 25 Sept. | Light rain shower | 15° /9° | 0.3 mm | 4 | |
| 26 Sept. | Sunny | 18° /7° | 2.2 mm | 5 | |
| 27 Sept. | Mist | 17° /9° | 37.6 mm | 4 | |
| 28 Sept. | Mist | 18° /11° | 2.7 mm | 4 | |
| 29 Sept. | Mist | 20° /7° | 0 mm | 5 | |
| 30 Sept. | Mist | 19° /10° | 0 mm | 5 | |
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Important Notice
Our weather forecast for New Brunswick 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 New Brunswick forecast closer to your planned date for the most up-to-date weather information.
New Brunswick in September - FAQ
What are the expected maximum and minimum temperatures in New Brunswick during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in New Brunswick during September?
Significant rainfall exceeding 108.5 mm is expected in New Brunswick during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in New Brunswick during September?
The average wind speed in New Brunswick during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in New Brunswick
Explore the daily rainfall trends and prepare for New Brunswicks September weather 💧
UV exposure in New Brunswick during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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