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Canada weather

Weather in Saint John for September 2026

Your guide to Saint John weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Saint John has been nearly identical to the historical average, with a temperature of 18.2 °C (showing only a slight deviation of 0.4 °C).

  • The forecast for the next days in Saint John predicts temperatures to be around 18 °C, close to the historical average.

  • In general, the average temperature in Saint John at the beginning of September is 19 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 17.4 °C by the end of September.

    • Rain 🌧️

  • Saint John in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 146.7 mm.

    • More

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Average dry days
14
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/11°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
82 %
Avg humidity

Saint John Weather September

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

Temperatures trend during September in Saint John

See the weather trend as well as the moving average line

September weather in Saint John day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 20° /10° 5.4 mm 6
2 Sept. Fog
Fog
 20° /11° 0.4 mm 5
3 Sept. Overcast
Overcast
 17° /9° 16.7 mm 4
4 Sept. Fog
Fog
 19° /11° 9.1 mm 4
5 Sept. Fog
Fog
 19° /12° 1.2 mm 5
6 Sept. Overcast
Overcast
 18° /12° 4 mm 4
7 Sept. Mist
Mist
 20° /12° 6.3 mm 5
8 Sept. Light rain shower
Light rain shower
 19° /11° 5.2 mm 4
9 Sept. Fog
Fog
 16° /9° 1.8 mm 4
10 Sept. Light rain shower
Light rain shower
 21° /11° 11 mm 3
11 Sept. Sunny
Sunny
 20° /10° 0 mm 5
12 Sept. Sunny
Sunny
 19° /8° 0 mm 5.5
13 Sept. Overcast
Overcast
 18° /11° 0 mm 2.6
14 Sept. Sunny
Sunny
 20° /10° 3.1 mm 3.9
15 Sept. Sunny
Sunny
 17° /6° 0 mm 5
16 Sept. Overcast
Overcast
 18° /8° 0.1 mm 5
17 Sept. Fog
Fog
 21° /14° 13.4 mm 5
18 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 16° /10° 69.5 mm 3
19 Sept. Sunny
Sunny
 15° /7° 0 mm 4
20 Sept. Sunny
Sunny
 16° /9° 0 mm 5
21 Sept. Sunny
Sunny
 19° /8° 0 mm 5
22 Sept. Overcast
Overcast
 15° /9° 0 mm 3
23 Sept. Light rain shower
Light rain shower
 17° /11° 79.4 mm 4
24 Sept. Sunny
Sunny
 18° /11° 2.5 mm 5
25 Sept. Patchy rain possible
Patchy rain possible
 16° /10° 8.8 mm 4
26 Sept. Sunny
Sunny
 17° /9° 34.7 mm 4
27 Sept. Sunny
Sunny
 18° /9° 24.7 mm 5
28 Sept. Mist
Mist
 17° /7° 0 mm 4
29 Sept. Fog
Fog
 18° /10° 0 mm 5
30 Sept. Mist
Mist
 18° /9° 0 mm 4
Next
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.
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Saint John in September - FAQ

What are the expected maximum and minimum temperatures in Saint John 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 Saint John during September?
Significant rainfall exceeding 146.7 mm is expected in Saint John during September, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Saint John during September?
The average wind speed in Saint John during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Saint John

Explore the daily rainfall trends and prepare for Saint Johns September weather 💧
Typically, Saint John has 16 rainy days in September with a total of 146.7 mm of rainfall.

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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Location coordinates Where is Saint John?

Get accurate weather forecasts for Saint John, located at latitude 45.271 and longitude -66.056. Stay updated with localized weather information tailored for Saint John.

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