Japan · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit Hiroshima are May, October and November, when daytime temperatures are agreeable and rainfall is relatively low.
Hiroshima sees its warmest weather in August, when daytime highs average around 33°C, and its coolest in January (around 10°C).
Annual precipitation totals roughly 1572mm — July is typically the wettest month (~280mm) and January the driest (~46mm).
A distinctly wetter period runs from March to September — worth planning around if you prefer dry days.
May is the sunniest month, with about 211 hours of sunshine.
🟧 avg daytime high · 🟦 dashed: avg nighttime low · bars: monthly rainfall
Daily forecast highs vs the 30-year normal — last 60 days
Each bar is one day: orange above normal, blue below.
| Month | High / Low | Rainfall | Travel rating |
|---|---|---|---|
| January | 10° / 2°C | 46mm | 🤔 Fair |
| February | 11° / 2°C | 64mm | 🤔 Fair |
| March | 15° / 5°C | 118mm | 🤔 Fair |
| April | 20° / 10°C | 141mm | 👍 Good |
| May | 24° / 15°C | 170mm | 👍 Good |
| June | 27° / 20°C | 227mm | 🤔 Fair |
| July | 31° / 24°C | 280mm | ⚠️ Challenging |
| August | 33° / 25°C | 131mm | 🤔 Fair |
| September | 29° / 21°C | 163mm | 🤔 Fair |
| October | 24° / 15°C | 109mm | 🌟 Great |
| November | 18° / 9°C | 69mm | 👍 Good |
| December | 12° / 4°C | 54mm | 🤔 Fair |
January in Hiroshima is chilly, with average daytime highs around 10°C (50°F) and nighttime lows near 2°C (36°F). Expect roughly 46mm of precipitation spread over about 6 rainy days, with little rainfall.
☀️ About 139 hours of sunshine over the month (~5h/day).
🎒 What to pack — jacket or coat · long-sleeve layers
February in Hiroshima is chilly, with average daytime highs around 11°C (52°F) and nighttime lows near 2°C (36°F). Expect roughly 64mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
☀️ About 140 hours of sunshine over the month (~5h/day).
🎒 What to pack — jacket or coat · long-sleeve layers
March in Hiroshima is mild, with average daytime highs around 15°C (58°F) and nighttime lows near 5°C (41°F). Expect roughly 118mm of precipitation spread over about 9 rainy days, and this is one of the wetter months.
☀️ About 177 hours of sunshine over the month (~6h/day).
🎒 What to pack — light jacket · layers for cool evenings · compact umbrella or rain jacket
April in Hiroshima is pleasantly warm, with average daytime highs around 20°C (68°F) and nighttime lows near 10°C (50°F). Expect roughly 141mm of precipitation spread over about 9 rainy days, and this is one of the wetter months.
☀️ About 192 hours of sunshine over the month (~6h/day).
🎒 What to pack — light layers · comfortable walking shoes · compact umbrella or rain jacket
May in Hiroshima is pleasantly warm, with average daytime highs around 24°C (76°F) and nighttime lows near 15°C (59°F). Expect roughly 170mm of precipitation spread over about 9 rainy days, and this is one of the wetter months.
☀️ About 211 hours of sunshine over the month (~7h/day).
🎒 What to pack — light layers · comfortable walking shoes · compact umbrella or rain jacket
June in Hiroshima is warm, with average daytime highs around 27°C (81°F) and nighttime lows near 20°C (68°F). Expect roughly 227mm of precipitation spread over about 11 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 155 hours of sunshine over the month (~5h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
July in Hiroshima is hot, with average daytime highs around 31°C (88°F) and nighttime lows near 24°C (75°F). Expect roughly 280mm of precipitation spread over about 11 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 173 hours of sunshine over the month (~6h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
August in Hiroshima is hot, with average daytime highs around 33°C (91°F) and nighttime lows near 25°C (77°F). Expect roughly 131mm of precipitation spread over about 8 rainy days, and this is one of the wetter months.
☀️ About 207 hours of sunshine over the month (~7h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
September in Hiroshima is warm, with average daytime highs around 29°C (84°F) and nighttime lows near 21°C (70°F). Expect roughly 163mm of precipitation spread over about 9 rainy days, and this is one of the wetter months.
☀️ About 167 hours of sunshine over the month (~6h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
October in Hiroshima is pleasantly warm, with average daytime highs around 24°C (75°F) and nighttime lows near 15°C (59°F). Expect roughly 109mm of precipitation spread over about 6 rainy days, with a moderate amount of rain.
☀️ About 179 hours of sunshine over the month (~6h/day).
🎒 What to pack — light layers · comfortable walking shoes
November in Hiroshima is mild, with average daytime highs around 18°C (64°F) and nighttime lows near 9°C (48°F). Expect roughly 69mm of precipitation spread over about 6 rainy days, with a moderate amount of rain.
☀️ About 153 hours of sunshine over the month (~5h/day).
🎒 What to pack — light jacket · layers for cool evenings
December in Hiroshima is chilly, with average daytime highs around 12°C (54°F) and nighttime lows near 4°C (39°F). Expect roughly 54mm of precipitation spread over about 6 rainy days, with little rainfall.
☀️ About 141 hours of sunshine over the month (~5h/day).
🎒 What to pack — jacket or coat · long-sleeve layers