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 13 rainy days, and a total of 46.4 mm of precipitation.
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Temperatures
Rain 🌧️
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17
Dry days
13
Rainy days
0
Snow days
15°/11°
Temperatures
25 km/h
Avg max wind
82 %
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?
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?
In September, St. John's can expect light to moderate rainfall, totaling 46.4 mm across approximately 13 days. Occasional showers are possible, and planning ahead for them could be helpful.
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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