Weather in Hiroshima: December
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Average day temperature: | 49.7°F |
| Average night temperature: | 39.4°F | |
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Sea water temperature: | 60.9°F |
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Number of sunny days: | 11 days |
| Day length: | 9.9 - 10.0 hours | |
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Number of rainy days: | 4 days |
| Precipitation totals: | 2.3 in. | |
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forecast
| Hiroshima |
temperature
| Hiroshima |
Air temperature in December, °F
The highest day temperature during December of 2025 was 61°F. At the same time the lowest night temperature was 31°F. Daily and nightly averages during December were 50.3°F and 40.7°F.
Sea water temperature in Hiroshima in December, °F
The average sea water temperature in December of 2025 was 61.5°F. The highest and lowest sea temperatures during the month were 64.8°F and 59.4°F.
Mostly all days in December are partly cloudy but sunny or cloudy days are also possible.
Precipitation total in December, in.
Precipitation total value in Hiroshima in December is 1.9 in. Other months of the year show relatively similar values.
The average wind speed value in December is 6.5 mph It makes December most windy month 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 December is: 5.7.
Best time for vacation in Hiroshima
Hiroshima on a weather map
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