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Weather in Saint John for September 2025

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

    Temperatures

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

  • Expect cooler weather in the next days in Saint John with the forecast suggesting a temperature of 17 °C, lower than the historical average.

  • In general, the average temperature in Saint John at the beginning of September is 19.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.7 °C by the end of September.

    • Rain 🌧️

  • The climate of Saint John in September is notably wet, with an average of 13 rainy days, and a total of 134.5 mm of precipitation.

    • More

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

Average dry days
17
Dry days
Average rainy days
13
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
19°
3
Overcast
18°
4
Fog
18°
5
Fog
20°
6
Overcast
20°
7
Mist
19°
8
Light rain shower
18°
9
Fog
17°
10
Light rain shower
19°
11
Moderate or heavy rain shower
19°
12
Sunny
20°
13
Fog
18°
14
Overcast
17°
15
Partly cloudy
21°
16
Partly cloudy
19°
17
Sunny
21°
18
Sunny
19°
19
Patchy rain possible
18°
20
Sunny
16°
21
Sunny
16°
22
Patchy rain possible
17°
23
Sunny
18°
24
Sunny
19°
25
Patchy rain possible
18°
26
Heavy rain
7°
27
Patchy rain possible
12°
28
Mist
18°
29
Fog
17°
30
Mist
19°

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° 7.2 mm 5
2 Sept. Fog
Fog
 19° /11° 0.5 mm 5
3 Sept. Overcast
Overcast
 18° /9° 0 mm 4
4 Sept. Fog
Fog
 18° /10° 0 mm 4
5 Sept. Fog
Fog
 20° /12° 0 mm 5
6 Sept. Overcast
Overcast
 20° /13° 0 mm 5
7 Sept. Mist
Mist
 19° /14° 8.4 mm 4
8 Sept. Light rain shower
Light rain shower
 18° /11° 6.9 mm 4
9 Sept. Fog
Fog
 17° /10° 2.3 mm 5
10 Sept. Light rain shower
Light rain shower
 19° /11° 4.8 mm 4
11 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 19° /10° 8 mm 5
12 Sept. Sunny
Sunny
 20° /12° 0 mm 5
13 Sept. Fog
Fog
 18° /10° 2.2 mm 4
14 Sept. Overcast
Overcast
 17° /11° 0 mm 1.1
15 Sept. Partly cloudy
Partly cloudy
 21° /11° 0 mm 1.3
16 Sept. Partly cloudy
Partly cloudy
 19° /8° 0 mm 1.3
17 Sept. Sunny
Sunny
 21° /11° 0 mm 1.3
18 Sept. Sunny
Sunny
 19° /11° 0 mm 0.1
19 Sept. Patchy rain possible
Patchy rain possible
 18° /8° 0.1 mm 3
20 Sept. Sunny
Sunny
 16° /6° 0 mm 3
21 Sept. Sunny
Sunny
 16° /5° 0 mm 4
22 Sept. Patchy rain possible
Patchy rain possible
 17° /12° 0.6 mm 3
23 Sept. Sunny
Sunny
 18° /8° 0 mm 4
24 Sept. Sunny
Sunny
 19° /8° 0 mm 4
25 Sept. Patchy rain possible
Patchy rain possible
 18° /12° 0.4 mm 3
26 Sept. Heavy rain
Heavy rain
 7° /6° 22.5 mm 2
27 Sept. Patchy rain possible
Patchy rain possible
 12° /6° 1.4 mm 2
28 Sept. Mist
Mist
 18° /8° 0 mm 5
29 Sept. Fog
Fog
 17° /9° 0 mm 4
30 Sept. Mist
Mist
 19° /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 134.5 mm is expected in Saint John during September, occurring over more than 13 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 💧

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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