Hiroshima weather by month & the best time to visit
Japan · major coastal city · humid subtropical climate
The best time to visit Hiroshima is October — its sunniest month (Sunshine Score 67/100), with August and May close behind. Hiroshima averages about 1,773 hours of sunshine a year. Daytime highs around 20°C / 68°F and roughly 121 mm of rain in October.
When is the best time to visit Hiroshima?
For sunshine, the best time to visit Hiroshima is October, then August and May. The dullest month is January (0/100, 60 mm of rain). The full month-by-month picture is in the table below.
How sunny is Hiroshima?
Hiroshima isn't a sunny place by world standards: about 1,773 hours of sunshine a year. 67 Sunshine Score points separate October (67) from January (0), so the month you pick matters. It ranks #40 of 79 destinations in Japan for annual sunshine, right at the national median of 1,773 hours. The year's 1,527 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | 6° / 43°F | -1° / 30°F | 60 mm | 2 | 14° / 57°F |
| February | 0 | 8° / 46°F | 0° / 32°F | 73 mm | 3 | 12° / 54°F |
| March | 17 | 11° / 52°F | 2° / 36°F | 104 mm | 4 | 12° / 54°F |
| April | 50 | 17° / 63°F | 6° / 43°F | 118 mm | 5 | 16° / 61°F |
| May | 63 | 22° / 72°F | 12° / 54°F | 142 mm | 6 | 18° / 64°F |
| June | 61 | 25° / 77°F | 17° / 63°F | 208 mm | 6 | 22° / 72°F |
| July | 61 | 28° / 82°F | 21° / 70°F | 240 mm | 7 | 26° / 79°F |
| August | 66 | 29° / 84°F | 22° / 72°F | 127 mm | 7 | 30° / 86°F |
| September | 61 | 26° / 79°F | 18° / 64°F | 179 mm | 6 | 29° / 84°F |
| October | 67 | 20° / 68°F | 12° / 54°F | 121 mm | 5 | 25° / 77°F |
| November | 44 | 15° / 59°F | 6° / 43°F | 76 mm | 3 | 21° / 70°F |
| December | 0 | 8° / 46°F | 1° / 34°F | 79 mm | 2 | 16° / 61°F |
Sea temperature in Hiroshima by month
The sea off Hiroshima is warmest in August at around 30°C / 86°F, and coolest in February at 12°C / 54°F. The water sits at a comfortable 21°C or warmer roughly 6 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
How Hiroshima compares month by month: Hiroshima vs Okayama · Hiroshima vs Matsuyama · Hiroshima vs Izumo · Hiroshima vs Iwakuni · all comparisons
Hiroshima: questions and answers
What kind of destination is Hiroshima?
Hiroshima is a major coastal city in Japan at 329 m elevation with a humid subtropical climate — the sea reaches 30°C at its warmest and is swimmable (21°C+) about 6 months a year.
How many hours of sunshine does Hiroshima get a year?
Hiroshima gets about 1,773 hours of sunshine a year, at its best around October.
When is the best time to visit Hiroshima?
The sunniest time to visit Hiroshima is October, when the Sunshine Score peaks at 67/100 (with August and May close behind). Expect daytime highs around 20°C / 68°F.
What is the least sunny month in Hiroshima?
January is the least sunny month in Hiroshima, scoring 0/100 with about 60 mm of rain.
What is the sea temperature in Hiroshima?
The sea in Hiroshima ranges from about 12°C (February) to 30°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Hiroshima?
The typical midday UV index in Hiroshima peaks around 7 (high) in July, easing to about 2 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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