May weather forecastHiroshima, Japan

May

Weather in May

May's weather in Hiroshima sees a noticeable shift towards the warmer side with temperatures beginning to feel like early summer. Rainfall surges to 178mm (7.01"), hinting that the monsoon months are nearing. While the temperatures rise, so does the humidity, making the air feel slightly heavy. An uptick in the UV index signals stronger sun rays, requiring adequate protections for outdoor activities. Against the backdrop of longer daylight hours, lush green landscapes of Hiroshima bask in the May sun, making it a picturesque time for visitors.

Temperature

Hiroshima's transition into May is marked by a minor temperature shift, moving from a comfortable 19.7°C (67.5°F) in April to a moderately hot 24.1°C (75.4°F). Throughout May, Hiroshima registers a consistent average low-temperature of 14.7°C (58.5°F).

Humidity

The average relative humidity in May in Hiroshima is 66%.

Rainfall

In Hiroshima, in May, it is raining for 14 days, with typically 178mm (7.01") of accumulated precipitation. Throughout the year, there are 190 rainfall days, and 1538mm (60.55") of precipitation is accumulated.

Snowfall

April through November are months without snowfall.

Sea temperature

In Hiroshima, in May, the average water temperature is 17.1°C (62.8°F).
Note: Swimming in water at 17.1°C (62.8°F) is not a pleasing experience for the majority. As the temperature descends from 21°C (69.8°F) to 15°C (59°F), controlling breathing becomes increasingly hard.

Daylight

In Hiroshima, the average length of the day in May is 13h and 58min.
On the first day of May, sunrise is at 05:20 and sunset at 18:54. On the last day of the month, sunrise is at 04:59 and sunset at 19:16 JST.

Sunshine

The average sunshine in May in Hiroshima is 6.7h.

UV index

The average daily maximum UV index in May is 9. A UV Index reading of 8 to 10 represents a very high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily high UV index of 9 in May translates into this advice:
Being careless can result in skin and eye damage. Always take the necessary safety measures. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun.

Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature in Hiroshima during May is 24.1°C (75.4°F) and the low-temperature is 14.7°C (58.5°F).

The average relative humidity in May in Hiroshima is 66%.

In May, in Hiroshima, the rain falls for 14 days. Throughout May, 178mm (7.01") of precipitation is accumulated.

April through November are months without snowfall in Hiroshima, Japan.

In May, the average sea temperature is 17.1°C (62.8°F). For most, swimming in 17.1°C (62.8°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

The average day length in May in Hiroshima, Japan, is 13h and 58min.

In May, on the first day of the month, sunrise is at 05:20 and sunset at 18:54. On the last day of the month, sunrise is at 04:59 and sunset at 19:16 JST.

In May, the average sunshine duration is 6.7h.

In Hiroshima, the average daily maximum UV index in May is 9. A UV Index estimate of 8 to 10 represents a very high hazard to health from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A May J J A S O N D

Apr

May

Jun

Average high temperature

19.7°C

24.1°C

27.2°C

Average low temperature

Average humidity

Average rainfall

Average rainfall days

Average snowfall

0mm

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average UV index

Average temperature in May
Hiroshima, Japan

Average high temperature in May: 24.1°C

The warmest month (with the highest average high temperature) is August (32.5°C).
The month with the lowest average high temperature is January (9.7°C).

Average low temperature in May: 14.7°C

The month with the highest average low temperature is August (24.8°C).
The coldest month (with the lowest average low temperature) is January (1.7°C).

Average humidity in May
Hiroshima, Japan

Average humidity in May: 66%

The month with the highest relative humidity is July (74%).
The month with the lowest relative humidity is April (63%).

Average rainfall in May
Hiroshima, Japan

Average rainfall in May: 177.6mm

The wettest month (with the highest rainfall) is July (258.6mm).
The driest month (with the least rainfall) is December (41.2mm).

Average rainfall days in May
Hiroshima, Japan

Average rainfall days in May: 14 days

The month with the highest number of rainy days is January (19 days).
The month with the least rainy days is October (12 days).

Average snowfall in May
Hiroshima, Japan

Average snowfall in May: 0mm

The month with the highest snowfall is January (50mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

Average snowfall days in May
Hiroshima, Japan

Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average sea temperature in May
Hiroshima, Japan

Average sea temperature in May: 17.1°C

The best month for swimming (with the highest average sea temperature) is August (26.8°C).
The coldest month (with the lowest average sea temperature) is February (12.4°C).

Average daylight in May /
Average sunshine in May
Hiroshima, Japan

Average daylight in May: 14h and 0min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

Average sunshine in May: 6h and 42min

The month with the most sunshine is August (Average sunshine: 6h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).