Weather in Jeju: January
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Average day temperature: | 44.8°F |
| Average night temperature: | 41.1°F | |
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Sea water temperature: | 59.3°F |
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Number of sunny days: | 7 days |
| Day length: | 10.0 - 10.5 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 2.5 in. | |
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forecast
| Jeju |
temperature
| Jeju |
Air temperature in January, °F
| Day temperature | Night temperature |
The highest day temperature during January of 2025 was 51°F. At the same time the lowest night temperature was 32°F. Daily and nightly averages during January were 44.7°F and 40.7°F.
Sea water temperature in Jeju in January, °F
The average sea water temperature in January of 2025 was 59.4°F. The highest and lowest sea temperatures during the month were 60.8°F and 57.6°F.
| Sunny days | |
| Partly cloudy days | |
| Cloudy days |
Mostly all days in January are cloudy but sunny and partly cloudy days are also possible.
Precipitation total in January, in.
Precipitation total value in Jeju in January is 3.0 in. Other months of the year show relatively similar values.
The average wind speed value in January is 13.3 mph It makes January one of the most windy months of the 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 January is: 4.6.
Best time for vacation in Jeju
Jeju on a weather map
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