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Canada weather

Weather in St. John's for September 2026

Your guide to St. John's weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in St. John's is slightly cooler than the historical average by 1.9 °C.

  • Expect cooler weather in the next days in St. John's with the forecast suggesting a temperature of 15.4 °C, lower than the historical average.

  • In general, the average temperature in St. John's at the beginning of September is 17.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.6 °C by the end of September.

    • Rain 🌧️

  • The climate of St. John's in September is notably wet, with an average of 15 rainy days, and a total of 53.8 mm of precipitation.

    • More

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

Average dry days
15
Dry days
Average rainy days
15
Rainy days
Average snowy days
0
Snow days
Average temperatures
15°/11°
Temperatures
Average wind speed
26 km/h
Avg max wind
Average humidity
81 %
Avg humidity

St. John's Weather September

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

Temperatures trend during September in St. John's

See the weather trend as well as the moving average line

September weather in St. John's day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
 16° /10° 0.6 mm 4
2 Sept. Sunny
Sunny
 16° /10° 2.2 mm 5
3 Sept. Sunny
Sunny
 17° /10° 4.8 mm 5
4 Sept. Overcast
Overcast
 18° /11° 0.3 mm 4
5 Sept. Light drizzle
Light drizzle
 15° /11° 1.7 mm 3
6 Sept. Fog
Fog
 19° /12° 3.5 mm 4
7 Sept. Patchy rain possible
Patchy rain possible
 20° /14° 0.4 mm 5
8 Sept. Patchy rain possible
Patchy rain possible
 18° /13° 2.8 mm 3
9 Sept. Overcast
Overcast
 15° /12° 2.5 mm 3
10 Sept. Overcast
Overcast
 17° /11° 0.5 mm 4
11 Sept. Patchy rain possible
Patchy rain possible
 16° /11° 3.5 mm 4
12 Sept. Patchy rain possible
Patchy rain possible
 11° /8° 1 mm 2.9
13 Sept. Overcast
Overcast
 18° /6° 0 mm 4.8
14 Sept. Overcast
Overcast
 18° /11° 9.9 mm 4.3
15 Sept. Overcast
Overcast
 18° /10° 4.8 mm 4
16 Sept. Sunny
Sunny
 17° /9° 0 mm 5
17 Sept. Overcast
Overcast
 20° /10° 0 mm 5
18 Sept. Patchy rain possible
Patchy rain possible
 17° /8° 1.2 mm 4
19 Sept. Patchy rain possible
Patchy rain possible
 13° /7° 0.4 mm 4
20 Sept. Overcast
Overcast
 17° /11° 3.3 mm 4
21 Sept. Sunny
Sunny
 17° /10° 0.1 mm 5
22 Sept. Sunny
Sunny
 15° /8° 0 mm 5
23 Sept. Overcast
Overcast
 13° /7° 0 mm 4
24 Sept. Overcast
Overcast
 10° /5° 0 mm 3
25 Sept. Overcast
Overcast
 11° /6° 0 mm 3
26 Sept. Partly cloudy
Partly cloudy
 14° /8° 1.6 mm 4
27 Sept. Patchy rain possible
Patchy rain possible
 14° /8° 0 mm 4
28 Sept. Partly cloudy
Partly cloudy
 13° /9° 0 mm 3
29 Sept. Sunny
Sunny
 14° /9° 0.5 mm 4
30 Sept. Sunny
Sunny
 12° /9° 0.7 mm 3
Next
Important Notice
Our weather forecast for St. John's 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 St. John's forecast closer to your planned date for the most up-to-date weather information.
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St. John's in September - FAQ

What are the expected maximum and minimum temperatures in St. John's during September?
During September, expect a variety of temperatures with highs around 15° and lows near 11°, suitable for diverse activities and preferences.

How much rainfall should be expected in St. John's during September?
Moderate rainfall is anticipated in St. John's during September, with a total of 53.8 mm spread over approximately 15 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in St. John's during September?
The average wind speed in St. John's during September is 26 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in St. John's

Explore the daily rainfall trends and prepare for St. John'ss September weather 💧
Typically, St. John's has 15 rainy days in September with a total of 53.8 mm of rainfall.

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Location coordinates Where is St. John's?

Get accurate weather forecasts for St. John's, located at latitude 47.565 and longitude -52.709. Stay updated with localized weather information tailored for St. John's.

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