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Canada weather

Weather in Saint John for September 2027

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

    Temperatures

  • In general, the average temperature in Saint John at the beginning of September is 18.8 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 17.3 °C by the end of September.

    • Rain 🌧️

  • Saint John experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 160.8 mm.

    • More

  • Is September a good time to visit Saint John? check out the best time to travel to Saint John page.

  • ✨ Is September a good time to visit Saint John? – Ask the AI Weatherman

Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/10°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
81 %
Avg humidity

Saint John Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Light rain
20°
2
Fog
20°
3
Moderate rain
17°
4
Light rain
19°
5
Patchy rain possible
19°
6
Light rain
18°
7
Light rain
19°
8
Light rain
19°
9
Patchy rain possible
16°
10
Moderate rain
20°
11
Moderate or heavy rain shower
19°
12
Sunny
19°
13
Light rain
17°
14
Light rain
18°
15
Overcast
19°
16
Moderate rain
19°
17
Light rain
18°
18
Light rain
17°
19
Patchy rain possible
17°
20
Overcast
16°
21
Overcast
18°
22
Overcast
16°
23
Light rain
16°
24
Mist
18°
25
Light rain
17°
26
Heavy rain
18°
27
Moderate rain
18°
28
Light rain
16°
29
Light rain
17°
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. Light rain
Light rain
 20° /10° 5.4 mm 6
2 Sept. Fog
Fog
 20° /11° 0.4 mm 5
3 Sept. Moderate rain
Moderate rain
 17° /10° 16.7 mm 4
4 Sept. Light rain
Light rain
 19° /12° 9.1 mm 4
5 Sept. Patchy rain possible
Patchy rain possible
 19° /12° 1.2 mm 5
6 Sept. Light rain
Light rain
 18° /13° 4 mm 4
7 Sept. Light rain
Light rain
 19° /13° 6.3 mm 5
8 Sept. Light rain
Light rain
 19° /11° 5.2 mm 4
9 Sept. Patchy rain possible
Patchy rain possible
 16° /10° 1.8 mm 4
10 Sept. Moderate rain
Moderate rain
 20° /11° 11 mm 3
11 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 19° /11° 6 mm 5
12 Sept. Sunny
Sunny
 19° /11° 0 mm 6
13 Sept. Light rain
Light rain
 17° /10° 4.5 mm 4
14 Sept. Light rain
Light rain
 18° /12° 2.8 mm 5
15 Sept. Overcast
Overcast
 19° /9° 0 mm 5
16 Sept. Moderate rain
Moderate rain
 19° /10° 16.9 mm 5
17 Sept. Light rain
Light rain
 18° /11° 2.7 mm 4
18 Sept. Light rain
Light rain
 17° /11° 2.9 mm 4
19 Sept. Patchy rain possible
Patchy rain possible
 17° /10° 1.9 mm 4
20 Sept. Overcast
Overcast
 16° /10° 0.1 mm 4
21 Sept. Overcast
Overcast
 18° /9° 0 mm 4
22 Sept. Overcast
Overcast
 16° /8° 0 mm 4
23 Sept. Light rain
Light rain
 16° /9° 3.6 mm 4
24 Sept. Mist
Mist
 18° /10° 0 mm 4
25 Sept. Light rain
Light rain
 17° /10° 6.6 mm 3
26 Sept. Heavy rain
Heavy rain
 18° /10° 26 mm 4
27 Sept. Moderate rain
Moderate rain
 18° /10° 18.6 mm 4
28 Sept. Light rain
Light rain
 16° /8° 3.8 mm 3
29 Sept. Light rain
Light rain
 17° /11° 3.1 mm 4
30 Sept. Mist
Mist
 18° /10° 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 10°. 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 160.8 mm is expected in Saint John during September, occurring over more than 8 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 16 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 8 rainy days in September with a total of 160.8 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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