Overview of Hiroshima’s Climate
Planning a trip to Hiroshima? Located in a temperate zone, Hiroshima experiences four distinct seasons. Generally, the climate is mild with an average annual temperature of around 16°C. However, each season brings its own charm and challenges—from the hot, humid summers to the crisp, cool winters.
Here is a complete guide to Hiroshima’s weather by month, including clothing recommendations and the best times to visit.
Spring (March – May)
The Best Season for Flowers & Sightseeing
Spring is widely considered the best time to visit Hiroshima. As the chill of winter fades, the city warms up, making it perfect for outdoor activities.
- March: Winter’s chill lingers in early March, requiring a coat or padding. By late March, cherry blossoms (Sakura) begin to bloom, and the weather becomes milder.
- April: The average temperature rises to 8°C–18°C. Cherry blossoms are in full bloom, but mornings and evenings can still be cool. A trench coat or cardigan over a light knit is ideal.
- May: A very pleasant month with highs reaching 22°C. You can wear short sleeves during the day, but carry a light jacket or windbreaker for cooler evenings.
What to Wear:
Layering is key. Wear light layers that you can easily take off as it gets warmer during the day.
- March: Winter coat, layers.
- April/May: Cardigan, trench coat, light jacket, long-sleeved shirts.
Summer (June – August)
Hot, Humid & The Rainy Season
Summer in Hiroshima is hot and humid, with temperatures often exceeding 30°C.
- June (Tsuyu – Rainy Season): The rainy season begins. Expect frequent rain (avg. 14 days/month) and high humidity. Breathable fabrics like linen and waterproof shoes are essential.
- July: The rainy season ends, and intense heat begins. Highs reach 29°C with humidity around 80%.
- August: The hottest month (highs >31°C) with tropical nights.
What to Wear:
Focus on cooling and breathability.
- Short-sleeved t-shirts, shorts, dresses (cotton/linen).
- Hat, sunglasses, and UV protection are must-haves.
- Portable fans and cooling sheets are highly recommended.
- June Tip: Bring a compact umbrella and rain gear.
Autumn (September – November)
Clear Skies & Beautiful Foliage
Autumn is another “Best Season” for travelers, offering comfortable temperatures and stunning scenery.
- September: Late summer heat (Zansho) remains, and typhoons are most frequent. Be prepared for sudden weather changes.
- October: One of the most comfortable months (14°C–23°C) with low humidity. Perfect for walking tours.
- November: The peak of autumn foliage. Temperatures drop (8°C–17°C), signaling the start of winter.
What to Wear:
- September: Short sleeves with a light outer layer.
- October: Long-sleeved shirts, hoodies, denim jackets.
- November: Warm knits, fleece jackets, or light down vests. A scarf is useful for chilly winds.
Winter (December – February)
Cold but Clear
Hiroshima’s winters are relatively mild compared to northern Japan, but cold winds can make it feel chillier than the thermometer suggests.
- December: Winter officially starts. Highs around 11°C, lows near 2°C.
- January: The coldest month (lows ~1°C). Snow is possible but heavy accumulation is rare.
- February: Similar to January, but signs of spring appear by late month.
What to Wear:
- Heavy coats, down jackets (long padding), and warm wool coats.
- Thermal underwear (Heattech), gloves, scarves, and beanies are recommended for outdoor sightseeing.
Hiroshima Monthly Weather Data
| Month | Avg High (°C) | Avg Low (°C) | Avg Rain (mm) | Humidity | Sunrise | Sunset |
| Jan | 9 | 1 | 45 | 69% | 07:13 | 17:29 |
| Feb | 10 | 1 | 59 | 69% | 06:47 | 17:59 |
| Mar | 14 | 4 | 109 | 67% | 06:11 | 18:23 |
| Apr | 18 | 8 | 164 | 69% | 05:30 | 18:47 |
| May | 22 | 13 | 154 | 71% | 05:03 | 19:10 |
| Jun | 25 | 18 | 272 | 78% | 04:58 | 19:25 |
| Jul | 29 | 23 | 246 | 80% | 05:13 | 19:19 |
| Aug | 31 | 24 | 117 | 77% | 05:36 | 18:50 |
| Sep | 29 | 21 | 175 | 76% | 05:58 | 18:07 |
| Oct | 23 | 14 | 103 | 72% | 06:21 | 17:28 |
| Nov | 17 | 8 | 73 | 72% | 06:49 | 17:02 |
| Dec | 11 | 2 | 39 | 71% | 07:13 | 17:04 |
FAQ: Hiroshima Weather
- When is the best time to visit Hiroshima?
A.Spring (late March–May)and Autumn (October–November). April is beautiful with cherry blossoms, while October and November offer pleasant weather and autumn leaves, making them perfect for outdoor activities. - Is it very hot in summer?
A.Yes, it is very hot and humid. August highs exceed 31°C, and the humidity makes it feel even hotter. Stay hydrated and avoid strenuous outdoor activities during midday. - When is the rainy season?
A.The rainy season (Tsuyu) typically runs from early June to mid-July. June and July see the highest rainfall. Carry an umbrella and waterproof gear if visiting during this time. - Should I worry about typhoons?
A.Typhoon season peaks from late August to September. Strong winds and rain can occur, so keep an eye on the weather forecast if you plan to travel then. - Does it snow in Hiroshima?
A.Snow falls occasionally in January and February but rarely accumulates in the city center. However, it can be quite cold due to the wind chill, so dress warmly.