Hiroshima weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Excellent
Best time to visit: April – July, September – November
What is the weather like in Hiroshima in May?
In May, Hiroshima is mild: daytime highs average 21 °C, and nights cool down to about 15 °C. The sea averages 16.9 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 10 rainy days and 161 mm in total. All in all, May is an excellent month for a holiday in Hiroshima.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 13 h 56 min05:08 – 19:04
- UV index
- 10 · very highclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 16 km/haverage daily peakAll months
- Cloud cover
- 63 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+9Asia/Tokyo
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %63 %
- Few rainy daysweight 30 %59 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in May
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Hiroshima in May: quick answers
Is Hiroshima hot in May?
No. In May, Hiroshima is mild: daytime highs average 21 °C and nights drop to about 15 °C.
Can you swim in Hiroshima in May?
Only if you don't mind cold water: in May the sea averages just 16.9 °C. Comfortable swimming is possible from June to November.
Does it rain much in Hiroshima in May?
Rain is frequent, with about 10 rainy days and 161 mm in total.
Hiroshima month by month
The whole year in HiroshimaAll destinations: JapanWhere to go in MaySea temperature in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences