St. John's
September
Weather in St. John's for September 2025
Your guide to St. John's weather in September - trends and predictions
In general, the average temperature in St. John's at the beginning of September is 17.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.6 °C by the end of September.
The climate of St. John's in September is notably wet, with an average of 14 rainy days.
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16
Dry days
14
Rainy days
0
Snow days
16°/11°
Temperatures
25 km/h
Avg max wind
85 %
Avg humidity
St. John's in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  16° | 2  17° | 3 19° | 4  17° | 5  16° | 6  20° | 7 19° |
| 8 18° | 9 17° | 10 19° | 11 16° | 12 14° | 13 16° | 14 15° |
| 15 16° | 16 18° | 17 19° | 18 17° | 19 14° | 20 15° | 21 13° |
| 22 11° | 23  14° | 24 13° | 25 11° | 26  13° | 27 12° | 28 13° |
| 29 14° | 30 12° |
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Temperatures trend during September in St. John's
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 16° /11° | 0.2 mm | 4 | |
| 2 Sept. | Sunny | 17° /12° | 4.4 mm | 5 | |
| 3 Sept. | Sunny | 19° /13° | 3 mm | 5 | |
| 4 Sept. | Overcast | 17° /11° | 0.1 mm | 4 | |
| 5 Sept. | Light drizzle | 16° /13° | 0.6 mm | 4 | |
| 6 Sept. | Fog | 20° /14° | 0.1 mm | 6 | |
| 7 Sept. | Fog | 19° /15° | 0 mm | 5 | |
| 8 Sept. | Light rain shower | 18° /14° | 3.9 mm | 4 | |
| 9 Sept. | Overcast | 17° /15° | 3.4 mm | 4 | |
| 10 Sept. | Light rain shower | 19° /13° | 0.8 mm | 5 | |
| 11 Sept. | Patchy rain possible | 16° /12° | 2.4 mm | 4 | |
| 12 Sept. | Overcast | 14° /12° | 0 mm | 4 | |
| 13 Sept. | Overcast | 16° /11° | 0 mm | 4 | |
| 14 Sept. | Overcast | 15° /12° | 2.2 mm | 4 | |
| 15 Sept. | Overcast | 16° /12° | 1.9 mm | 4 | |
| 16 Sept. | Light rain shower | 18° /12° | 1 mm | 5 | |
| 17 Sept. | Light rain shower | 19° /16° | 0.7 mm | 5 | |
| 18 Sept. | Overcast | 17° /11° | 0.5 mm | 4 | |
| 19 Sept. | Patchy rain possible | 14° /10° | 0.3 mm | 3 | |
| 20 Sept. | Light rain shower | 15° /12° | 12.2 mm | 4 | |
| 21 Sept. | Patchy rain possible | 13° /9° | 1.6 mm | 3 | |
| 22 Sept. | Light rain shower | 11° /7° | 2.7 mm | 3 | |
| 23 Sept. | Cloudy | 14° /7° | 0.2 mm | 4 | |
| 24 Sept. | Patchy rain possible | 13° /10° | 1.1 mm | 3 | |
| 25 Sept. | Light rain shower | 11° /9° | 2.9 mm | 3 | |
| 26 Sept. | Partly cloudy | 13° /7° | 0 mm | 4 | |
| 27 Sept. | Patchy rain possible | 12° /8° | 0 mm | 4 | |
| 28 Sept. | Partly cloudy | 13° /9° | 0.1 mm | 4 | |
| 29 Sept. | Sunny | 14° /9° | 0 mm | 4 | |
| 30 Sept. | Sunny | 12° /10° | 0.2 mm | 4 | |
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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.
St. John's in September - FAQ
What are the expected maximum and minimum temperatures in St. John's during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
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 50.8 mm spread over approximately 14 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 25 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 💧
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