The highest day temperature in January 2026 was 58°F. The lowest night temperature was 27°F. The average values for day and night temperatures during January were 44.9°F и 33.0°F respectivly.

The average sea surface temperature in January 2026 for Hiroshima was 57.2°F. The maximum and minimum values were 54.0°F and 60.6°F respectively.

You can expect various weather conditions during January. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in January for Hiroshima is 1.9 in. It makes january the least rainy month of the year.

The average wind speed in January is 5.9 mph. This value is relatively stable throughout the year.

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 Hiroshima in January is 5.9 hours.