Grand Falls-Windsor Weather in September
What's the weather like in Grand Falls-Windsor (Newfoundland and Labrador) in September 2025?
The climate in Grand Falls-Windsor during September can be summarized as mild and a little damp.
September is in the fall / autumn in Grand Falls-Windsor and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 17°C (62°F), whilst at night 7°C (44°F) is normal.
| Daytime temperature | 16.8°C 62.2°F |
|---|---|
| Nightly temperature | 6.7°C 44°F |
| Average temperature | 11.7°C 53.1°F |
| Daily sunshine | 5.1 hrs |
| Avg rainfall | 83 mm 3.3 ins |
| Rainy days | 14 days |
| Sea temperature | 12.5°C 54.4°F |
| Humidity | 82% |
| Windspeed | 18.7kph 12 mph |
On average September is the 4th driest month of the year in Grand Falls-Windsor with around 83mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 14 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.1 hours of sunshine per day.
September temperatures in Grand Falls-Windsor
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Grand Falls-Windsor in September 2025.
Other monthly averages
Best places to visit in September
Grand Falls-Windsor weather stats
| Hottest month: | July | 22.9°C 73.2°F |
|---|---|---|
| Driest month: | May | 72mm 2.8ins |
| Sunniest month: | July | 7.1hrs |
| Coldest month: | February | -2.9°C 26.8°F |
| Wettest month: | January | 103mm 4.1ins |
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