Newfoundland and Labrador (St. John's)
September
Weather in Newfoundland and Labrador for September 2025
Your guide to Newfoundland and Labrador weather in September - trends and predictions
In general, the average temperature in Newfoundland and Labrador 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 Newfoundland and Labrador 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
Newfoundland and Labrador 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 Newfoundland and Labrador
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 Newfoundland and Labrador 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 Newfoundland and Labrador forecast closer to your planned date for the most up-to-date weather information.
Newfoundland and Labrador in September - FAQ
What are the expected maximum and minimum temperatures in Newfoundland and Labrador 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 Newfoundland and Labrador during September?
Moderate rainfall is anticipated in Newfoundland and Labrador 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 Newfoundland and Labrador during September?
The average wind speed in Newfoundland and Labrador during September is 25 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Newfoundland and Labrador
Explore the daily rainfall trends and prepare for Newfoundland and Labradors September weather 💧
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