Hiroshima in May: weather, what to wear and what's on

Hiroshima weather in May

Averages for 1991–2020 at the JMA's Hiroshima station (4 m above sea level).

High

24.4°C (76°F)

Low

15.1°C (59°F)

Precipitation

169.8 mm

Wet days

8.6 days

Sunshine

211 hours

Highs rise 4.6°C from April and climb another 2.8°C into June.

That is 3.3°C above Hiroshima's yearly average high of 21.1°C.

Of our 14 places with temperature records, Hiroshima is the 7th warmest in May: level with Fukuoka and 0.8°C warmer than Tokyo.

May is Hiroshima's 3rd wettest month (169.8 mm).

Of our 15 places, Hiroshima has the 3rd highest precipitation in May: 75.5 mm less than Naha and 2.1 mm more than Nikko.

Rain of 1 mm or more falls on 8.6 days, and 10 mm or more on 4.9 days.

Rain of 30 mm or more in one day falls on 2.1 days, and 50 mm or more on 0.7 days.

The sun is out for 40% or more of the possible hours on 18.8 days, and 4.5 days have under 0.1 hours of sunshine.

By the JMA's cloud records, 3.0 days are clear and 12.0 are overcast.

On 15 May 2027 the sun rises at 5:08 and sets at 19:05 in Hiroshima, giving 13 hours 57 minutes of daylight (NAOJ).

Average temperature

19.6°C (67°F)

Humidity

63%

Days of 25°C or more

14.7 days

Early, mid and late May

By the last ten days of May the average high in Hiroshima is 2.0°C higher than in the first ten.

By ten-day totals, 11–20 May is the wettest (62.4 mm) and 21–31 May the driest (48.8 mm).

What to wear in Hiroshima in May

Mild: highs around 24.4°C

• Long sleeves, or a T-shirt with a light jacket or cardigan.
• Layers you can take off: afternoons are 9.3°C warmer than early mornings on average.
• A folding umbrella: rain falls on 8.6 days.

Pack

• Folding umbrella

• Our clothing rules

Rainy season and typhoons

In an average May, 0.1 typhoons come within 300 km of the Chugoku region; across Japan, 0.7 come within 300 km (JMA, 1991–2020).

May records in Hiroshima

The extremes the JMA has measured in May at its Hiroshima station.

Hottest May day

31.5°C (89°F) on 22 May 1998 (records since 1879)

Coldest May night

1.8°C (35°F) on 6 May 1940 (records since 1879)

Wettest May day

128.1 mm on 26 May 1965 (records since 1879)

Holidays and crowds in May

National holidays in May 2027:

• Mon 3 May — Constitution Memorial Day
• Tue 4 May — Greenery Day
• Wed 5 May — Children's Day

• Sat 1 May to Wed 5 May: 5 days off in a row

In May 2025, hotels and inns across Hiroshima Prefecture were 67.5% full on average (4th busiest of 12 months). Foreign guests spent 226,720 nights there that month (Japan Tourism Agency). That compares with 67.5% in April and 59.5% in June.

• Japan in May: visitor numbers and busy travel days
• Holidays in May
• Golden Week

What's on in Hiroshima in May

Hiroshima before and after May

• Hiroshima in April
• Hiroshima in June
• All 12 months in Hiroshima

Other places in May

• All 15 places in May

Related items

• Hiroshima by month
• Japan in May
• Hiroshima in April
• Hiroshima in June