Weather in Reykjavik: September
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Average day temperature: | 49.7°F |
| Average night temperature: | 45.0°F | |
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Sea water temperature: | 50.6°F |
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Number of sunny days: | 4 days |
| Day length: | 11.4 - 14.5 hours | |
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Number of rainy days: | 9 days |
| Precipitation totals: | 4.5 in. | |
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forecast
| Reykjavik |
temperature
| Reykjavik |
Air temperature in September, °F
The highest day temperature during September of 2025 was 57°F. At the same time the lowest night temperature was 36°F. Daily and nightly averages during September were 50.3°F and 46.5°F.
Sea water temperature in Reykjavik in September, °F
The average sea water temperature in September of 2025 was 53.7°F. The highest and lowest sea temperatures during the month were 56.7°F and 50.7°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 Reykjavik in September is 3.8 in. Other months of the year show relatively similar values.
The average wind speed value in September is 12.4 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: 4.4.
Best time for vacation in Reykjavik
Reykjavik on a weather map
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