The highest day temperature in January 2026 was 61°F. The lowest night temperature was 32°F. The average values for day and night temperatures during January were 49.1°F и 43.2°F respectivly.

The average sea surface temperature in January 2026 for Nagasaki was 63.3°F. The maximum and minimum values were 60.6°F and 66.2°F respectively.

Most of the days in January are gloomy but you can also expect sunny days.

Precipitation total in January for Nagasaki is 2.3 in. It makes january the least rainy month of the year.

The average wind speed in January is 10.8 mph. It makes January the most windy month of the year for Nagasaki.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Nagasaki in January is 5.2 hours.