Hiroshima Weather
A month-by-month look at temperature, rainfall and what to pack in Hiroshima. The annual average is 21°C high / 12°C low — hottest in August (33°C) and coldest in January (2°C).
Hiroshima Weather at a Glance
As of 2026A quick summary of Hiroshima's year-round climate and the best time to visit.
- Annual average
- 21° / 12°
- Best time to visit
- October, March, April
- Hottest month
- August (33°C)
- Coldest month
- January (2°C)
- Wettest month
- July (250mm)
- Driest month
- January (50mm)
As of 2026, Hiroshima's weather averages 21°C high / 12°C low across the year, and the best time to visit for stable temperatures, rainfall and crowds is October, March, April. The hottest month is August (33°C), the coldest is January (2°C), and the wettest is July (250mm).
Best Time to Visit Hiroshima
BEST MONTH — perfect weather + clear skies + autumn leaves starting. Less crowded than spring.
Cherry blossom March 25-April 10 — most photogenic. Hotels surge 60-100%. Book 3-6 months ahead. Hiroshima Castle moat + Peace Park magical.
Ideal weather + Golden Week last week brings tripled hotels. Book 6+ months ahead.
Hiroshima Weather Month by Month
Tap any month for a detailed guide with what to wear, sunrise/sunset and air quality.
| Month | High/Low | Rain | Rainy days | Crowds | |
|---|---|---|---|---|---|
| January | 10° / 2° | 50mm | 7 | Quiet | Details → |
| February | 11° / 2° | 60mm | 7 | Quiet | Details → |
| March | 14° / 5° | 110mm | 10 | Very busy | Details → |
| April | 19° / 10° | 130mm | 10 | Very busy | Details → |
| May | 23° / 14° | 130mm | 10 | Very busy | Details → |
| June | 27° / 19° | 230mm | 13 | Moderate | Details → |
| July | 31° / 24° | 250mm | 11 | Busy | Details → |
| August | 33° / 24° | 130mm | 8 | Very busy | Details → |
| September | 29° / 20° | 200mm | 10 | Moderate | Details → |
| October | 23° / 14° | 100mm | 6 | Busy | Details → |
| November | 17° / 8° | 80mm | 6 | Busy | Details → |
| December | 12° / 4° | 50mm | 6 | Moderate | Details → |
What to Wear in Hiroshima by Season
Spring perfect. Light jacket + sweater for evening.
Hot + humid + tsuyu lingering. T-shirt + UV.
Pleasant autumn. T-shirt + light jacket.
Cold. Heavy coat + sweater.
Hiroshima Weather FAQ
What is the best time to visit Hiroshima? +
For weather, October, March, April are the most comfortable months. Highs sit around 23°C with relatively stable rainfall and crowds.
What are the hottest and coldest months in Hiroshima? +
The hottest month is August with an average high of 33°C, and the coldest is January with an average low of 2°C. The annual average is 21°C high / 12°C low.
When does it rain most in Hiroshima? +
The wettest month is July (250mm over about 11 rainy days) and the driest is January (50mm). Total annual rainfall is roughly 1520mm.
What should I pack for Hiroshima? +
Spring (Mar–May) averages 19/10°C — Spring perfect. Light jacket + sweater for evening. Summer (Jun–Aug) averages 30/22°C — Hot + humid + tsuyu lingering. T-shirt + UV. Autumn (Sep–Nov) averages 23/14°C — Pleasant autumn. T-shirt + light jacket. Winter (Dec–Feb) averages 11/3°C — Cold. Heavy coat + sweater.
What is the weather in Hiroshima this month (June)? +
June averages 27°C high / 19°C low with 230mm rainfall over about 13 rainy days. Crowds are moderate and prices are moderate.
Keep Planning Your Hiroshima Trip
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.