Weather in Sundsvall: September
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Average day temperature: | 56.8°F |
| Average night temperature: | 47.6°F | |
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Sea water temperature: | 56.0°F |
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Number of sunny days: | 9 days |
| Day length: | 11.5 - 14.4 hours | |
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Number of rainy days: | 4 days |
| Precipitation totals: | 1.7 in. | |
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forecast
| Sundsvall |
temperature
| Sundsvall |
Air temperature in September, °F
The highest day temperature during September of 2025 was 68°F. At the same time the lowest night temperature was 41°F. Daily and nightly averages during September were 58.9°F and 50.7°F.
Sea water temperature in Sundsvall in September, °F
The average sea water temperature in September of 2025 was 57.5°F. The highest and lowest sea temperatures during the month were 60.6°F and 53.1°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 Sundsvall in September is 1.5 in. Other months of the year show relatively similar values.
The average wind speed value in September is 6.3 mph The wind's strength is relatively same during the whole year.
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: 6.2.
Best time for vacation in Sundsvall
Sundsvall on a weather map
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