September
Weather in Saint John for September 2025
Your guide to Saint John weather in September - trends and predictions
In general, the average temperature in Saint John at the beginning of September is 29 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 29.1 °C by the end of September.
Saint John experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
Is September a good time to visit Saint John? check out the best time to travel to Saint John page.
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6
Dry days
24
Rainy days
0
Snow days
29°/28°
Temperatures
24 km/h
Avg max wind
73 %
Avg humidity
Saint John in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  29° | 2 29° | 3 29° | 4 29° | 5 29° | 6 29° | 7 29° |
| 8 29° | 9 29° | 10 29° | 11 30° | 12  29° | 13  29° | 14 29° |
| 15 29° | 16 29° | 17  29° | 18 29° | 19 29° | 20 29° | 21 30° |
| 22 29° | 23 29° | 24 29° | 25 29° | 26 29° | 27 30° | 28 29° |
| 29 29° | 30 29° |
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Temperatures trend during September in Saint John
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September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 29° /28° | 2.2 mm | 6 | |
| 2 Sept. | Patchy rain possible | 29° /28° | 4.9 mm | 6 | |
| 3 Sept. | Patchy rain possible | 29° /28° | 2.7 mm | 6 | |
| 4 Sept. | Patchy rain possible | 29° /28° | 1.7 mm | 6 | |
| 5 Sept. | Light rain shower | 29° /28° | 1.8 mm | 6 | |
| 6 Sept. | Light rain shower | 29° /28° | 9 mm | 6 | |
| 7 Sept. | Patchy rain possible | 29° /28° | 3.9 mm | 6 | |
| 8 Sept. | Light rain shower | 29° /28° | 8.8 mm | 6 | |
| 9 Sept. | Patchy rain possible | 29° /27° | 8.5 mm | 6 | |
| 10 Sept. | Patchy rain possible | 29° /28° | 5.4 mm | 6 | |
| 11 Sept. | Light rain shower | 30° /28° | 2.3 mm | 7 | |
| 12 Sept. | Cloudy | 29° /28° | 0.2 mm | 6 | |
| 13 Sept. | Partly cloudy | 29° /27° | 5.1 mm | 7 | |
| 14 Sept. | Partly cloudy | 29° /28° | 0.5 mm | 7 | |
| 15 Sept. | Partly cloudy | 29° /28° | 0.2 mm | 7 | |
| 16 Sept. | Patchy rain possible | 29° /27° | 2.6 mm | 6 | |
| 17 Sept. | Patchy light rain | 29° /28° | 1.6 mm | 7 | |
| 18 Sept. | Patchy rain possible | 29° /28° | 0.2 mm | 6 | |
| 19 Sept. | Patchy rain possible | 29° /28° | 0.4 mm | 6 | |
| 20 Sept. | Patchy light drizzle | 29° /28° | 2.5 mm | 6 | |
| 21 Sept. | Light rain shower | 30° /28° | 6.1 mm | 7 | |
| 22 Sept. | Patchy rain possible | 29° /28° | 0.3 mm | 6 | |
| 23 Sept. | Patchy light drizzle | 29° /27° | 0.9 mm | 6 | |
| 24 Sept. | Light rain shower | 29° /28° | 1.7 mm | 6 | |
| 25 Sept. | Light rain shower | 29° /28° | 3 mm | 6 | |
| 26 Sept. | Patchy light rain | 29° /28° | 3.7 mm | 6 | |
| 27 Sept. | Light rain shower | 30° /28° | 4 mm | 7 | |
| 28 Sept. | Patchy light drizzle | 29° /28° | 2.5 mm | 6 | |
| 29 Sept. | Patchy rain possible | 29° /28° | 1.5 mm | 6 | |
| 30 Sept. | Patchy light drizzle | 29° /28° | 7.1 mm | 6 | |
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Important Notice
Our weather forecast for Saint John 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 Saint John forecast closer to your planned date for the most up-to-date weather information.
Saint John in September - FAQ
What are the expected maximum and minimum temperatures in Saint John during September?
During September, expect a variety of temperatures with highs around 29° and lows near 28°, suitable for diverse activities and preferences.
How much rainfall should be expected in Saint John during September?
Moderate rainfall is anticipated in Saint John during September, with a total of 92.5 mm spread over approximately 24 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Saint John during September?
The average wind speed in Saint John during September is 24 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Saint John in September?
As you prepare for your trip to Saint John in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Saint John, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Sandals/Flip-flops: Comfortable for warm climates
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
September rainfall patterns in Saint John
Explore the daily rainfall trends and prepare for Saint Johns September weather 💧
UV exposure in Saint John during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Saint John?Get accurate weather forecasts for Saint John, located at latitude 17.121 and longitude -61.843. Stay updated with localized weather information tailored for Saint John.
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