Weather in St. John's: September
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Average day temperature: | 60.3°F |
| Average night temperature: | 54.7°F | |
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Sea water temperature: | 57.0°F |
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Number of sunny days: | 7 days |
| Day length: | 11.7 - 13.4 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 1.5 in. | |
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forecast
| St. John's |
temperature
| St. John's |
Air temperature in September, °F
The highest day temperature during September of 2025 was 74°F. At the same time the lowest night temperature was 43°F. Daily and nightly averages during September were 59.9°F and 51.9°F.
Sea water temperature in St. John's in September, °F
The average sea water temperature in September of 2025 was 56.1°F. The highest and lowest sea temperatures during the month were 58.5°F and 54.0°F.
Mostly all days in September are cloudy but sunny and partly cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in St. John's in September is 1.5 in. Other months of the year show relatively similar values.
The average wind speed value in September is 12.0 mph
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 5.4.
Best time for vacation in St. John's
St. John's on a weather map
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