New Brunswick (Saint John)
September
Weather in New Brunswick for September 2026
Your guide to New Brunswick weather in September - trends and predictions
Until now, September 2026 in New Brunswick has been nearly identical to the historical average, with a temperature of 18 °C (showing only a slight deviation of 0.2 °C).
The forecast for the next days in New Brunswick predicts temperatures to be around 16 °C, close to the historical average.
In general, the average temperature in New Brunswick at the beginning of September is 19 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 17 °C by the end of September.
New Brunswick in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 146.7 mm.
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Temperatures
Rain 🌧️
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14
Dry days
16
Rainy days
0
Snow days
18°/11°
Temperatures
15 km/h
Avg max wind
82 %
Avg humidity
New Brunswick Weather September
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What’s the Weather Like in New Brunswick This September?
Discover the average temperatures and weather trends across New Brunswick’s cities this September.
Temperatures trend during September in New Brunswick
See the weather trend as well as the moving average line
September weather in New Brunswick day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 20° /10° | 5.4 mm | 6 | |
| 2 Sept. |  Fog | 20° /11° | 0.4 mm | 5 | |
| 3 Sept. |  Overcast | 17° /9° | 16.7 mm | 4 | |
| 4 Sept. | Fog | 19° /11° | 9.1 mm | 4 | |
| 5 Sept. | Fog | 19° /12° | 1.2 mm | 5 | |
| 6 Sept. | Overcast | 18° /12° | 4 mm | 4 | |
| 7 Sept. | Mist | 20° /12° | 6.3 mm | 5 | |
| 8 Sept. |  Light rain shower | 19° /11° | 5.2 mm | 4 | |
| 9 Sept. | Fog | 16° /9° | 1.8 mm | 4 | |
| 10 Sept. | Light rain shower | 21° /11° | 11 mm | 3 | |
| 11 Sept. |  Moderate or heavy rain shower | 19° /10° | 6 mm | 5 | |
| 12 Sept. | Sunny | 20° /10° | 0 mm | 6 | |
| 13 Sept. | Fog | 18° /10° | 4.5 mm | 4 | |
| 14 Sept. |  Heavy rain | 19° /11° | 2.8 mm | 5 | |
| 15 Sept. | Overcast | 19° /8° | 0 mm | 5 | |
| 16 Sept. | Light rain shower | 19° /10° | 16.9 mm | 5 | |
| 17 Sept. | Overcast | 18° /10° | 2.7 mm | 4 | |
| 18 Sept. |  Light drizzle | 17° /11° | 2.9 mm | 4 | |
| 19 Sept. | Fog | 17° /10° | 1.9 mm | 4 | |
| 20 Sept. | Overcast | 16° /10° | 0.1 mm | 4 | |
| 21 Sept. | Overcast | 18° /9° | 0 mm | 4 | |
| 22 Sept. | Overcast | 16° /7° | 0 mm | 4 | |
| 23 Sept. | Overcast | 16° /9° | 3.6 mm | 4 | |
| 24 Sept. | Mist | 18° /9° | 0 mm | 4 | |
| 25 Sept. | Overcast | 18° /9° | 6.6 mm | 3 | |
| 26 Sept. | Sunny | 18° /10° | 26 mm | 4 | |
| 27 Sept. | Overcast | 18° /13° | 0.5 mm | 2 | |
| 28 Sept. | Overcast | 16° /12° | 5 mm | 1.5 | |
| 29 Sept. | Patchy rain possible | 15° /12° | 0.6 mm | 0.6 | |
| 30 Sept. | Mist | 16° /12° | 6.5 mm | 4.2 | |
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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.
Change Month
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 18° 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 146.7 mm is expected in New Brunswick during September, occurring over more than 16 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 💧
Typically, New Brunswick has 16 rainy days in September with a total of 146.7 mm of rainfall.
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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