Hiroshima enjoys a humid subtropical climate with four distinct seasons, featuring hot, humid summers and cool to mild winters. The city experiences significant rainfall, especially during the summer rainy season, but winters are relatively dry and sunny. Seasonal highlights include cherry blossoms in spring and colourful foliage in autumn, making Hiroshima attractive year-round.
The best times to travel section shows how the months compare for a visit, so you can find the time of year that fits what you want to do.
Background colours of the months:
The colour shows the typical temperature: yellow (hot), green (mild) and blue (cold). How strong the colour is shows the travel season: full colour means high season, soft colour means shoulder season and soft-striped means off season.
Weather symbols:
Each month has one symbol showing what the weather is typically like, such as hot and sunny, freezing or a rainy or snowy season. Use them to quickly spot months that match the weather you want, or to avoid the ones that don't.
Crowdedness:
The people icon shows how busy the place usually is. The more people, the more crowded it gets.
Additional notes:
The grey info boxes point out special things worth knowing, like recurring weather issues or seasonal events.
Hiroshima’s climate is characterised by clear seasonal changes. Summers (June–August) are hot and humid, with average highs reaching 31–33°C in July and August. The rainy season (tsuyu) peaks in June and July, delivering the highest monthly rainfall – over 250 mm is typical for June. Humidity is high, and typhoons may bring strong winds and heavy rain, especially from late summer into early autumn. Despite the rain, August tends to be sunnier and drier than June and July.
Winters (December–February) are cool to mild, with average highs of 9–12°C and lows near 1–4°C. Snowfall is rare and usually light, with only a few days of snow per year that melts quickly. Spring (March–May) and autumn (September–November) are the most pleasant seasons, with mild temperatures (14–24°C), moderate rainfall, and abundant sunshine. Cherry blossoms bloom in late March to early April, while autumn foliage peaks from late October to mid-November. Hiroshima receives about 1,500–1,600 mm of precipitation annually and enjoys around 1,900–2,000 hours of sunshine per year. Winds are generally light to moderate, though can pick up during storms or typhoons.
| Average climate data for Hiroshima, Japan | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average maximum temperature (°C) | 10 | 11 | 14 | 20 | 24 | 27 | 31 | 32 | 29 | 23 | 17 | 12 | 32 |
| Average minimum temperature (°C) | 2 | 2 | 5 | 10 | 15 | 19 | 24 | 25 | 21 | 14 | 9 | 4 | 2 |
| Average precipitation (mm) | 45 | 67 | 124 | 142 | 178 | 249 | 256 | 111 | 167 | 89 | 68 | 42 | 1,538 |
| Average rainfall days (days) | 19 | 18 | 18 | 15 | 14 | 17 | 17 | 14 | 16 | 12 | 13 | 17 | 190 |
| Average snowfall (mm) | 49 | 40 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 30 | 130 |
| Average snowfall days (days) | 9 | 7 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 24 |
| Average relative humidity (%) | 68 | 68 | 63 | 63 | 67 | 72 | 73 | 71 | 70 | 67 | 69 | 69 | 68 |
| Average water temperature (°C) | 14 | 12 | 12 | 14 | 17 | 21 | 25 | 27 | 26 | 23 | 20 | 17 | 19 |
| Average daily daylight hours (h) | 10 | 11 | 12 | 13 | 14 | 14 | 14 | 13 | 12 | 11 | 10 | 9 | 12 |
| Average daily sunshine hours (h) | 4 | 5 | 5 | 6 | 6 | 5 | 5 | 6 | 5 | 5 | 5 | 4 | 5 |
| Average UV index | 3 | 4 | 6 | 8 | 9 | 10 | 11 | 10 | 8 | 6 | 4 | 3 | 7 |
The best time to visit Hiroshima is in spring (late March to May) and autumn (late September to November). These periods offer mild, comfortable temperatures, lower humidity, and the city’s most beautiful scenery – cherry blossoms or vibrant autumn leaves. Outdoor activities, sightseeing, and festivals are especially enjoyable during these clear, pleasant months.
The least favourable time to visit Hiroshima is from mid-June to early September, when the city experiences its rainy season, peak summer heat, and high humidity. Typhoons may also occur in late summer, bringing heavy rain and possible travel disruptions. Outdoor activities can be uncomfortable during this period.
Hiroshima has a humid subtropical climate with hot, humid summers and cool to mild winters. Rainfall is significant in summer, while spring and autumn are mild and pleasant.
The rainy season (tsuyu) in Hiroshima typically lasts from mid-June to late July, bringing frequent showers and high humidity. September can also be wet due to typhoons.
Snowfall in Hiroshima is rare and usually light. When it does snow, it typically melts quickly due to mild winter temperatures, and heavy accumulations are uncommon.
Summer temperatures in Hiroshima range from 20°C at night to 33°C during the day. Humidity is high, making it feel hotter, especially in July and August.
Yes, Hiroshima can be affected by typhoons, mainly from August to September. Typhoons bring heavy rain and strong winds, so travellers should monitor weather forecasts during this period.
Cherry blossoms in Hiroshima usually bloom from late March to early April. This period offers mild weather and is ideal for outdoor activities and hanami (flower viewing) parties.
Hiroshima receives about 1,900–2,000 hours of sunshine per year. The sunniest months are April to September, while December and January are the least sunny.
The warmest month, with the highest average maximum temperature, is August (32.5 °C). The month with the lowest average maximum temperature is January (9.8 °C). Overall, the average maximum temperature over the whole year is 20.9 °C.
The month with the highest average minimum temperature is August (24.8 °C). The coldest month, with the lowest average minimum temperature, is January (1.7 °C). Overall, the average minimum temperature over the whole year is 12.4 °C.
The month with the highest average water temperature is August (26.9 °C). The month with the lowest average water temperature is February (12.4 °C). Overall, the average water temperature over the whole year is 19.1 °C.
The wettest month, with the highest amount of precipitation, is July (255.9 mm). The driest month, with the least amount of precipitation, is December (41.7 mm). Over the whole year there are 1,537.8 mm of rainfall on average.
The month with the most days of rain is January (19 days). The month with the fewest days of rain is October (11.9 days). Over the whole year there are 190 days of rain on average.
The month with the most snowfall is January (49.3 mm). The months with the least snowfall are April, May, June, July, August, September, October and November (0 mm). Over the whole year there are 130 mm of snowfall on average.
The month with the most days of snowfall is January (8.7 days). The months with the fewest days of snowfall are June and September (0 days). Over the whole year there are 23.6 days of snowfall on average.
The month with the highest average relative humidity is July (73.1 %). The month with the lowest average relative humidity is April (63.1 %). The overall average relative humidity over the whole year is 68.3 %.
The month with the longest days, so the most daylight, is June (Average daylight: 14 h). The month with the shortest days, so the least daylight, is December (Average daylight: 9.1 h). Over the whole year there are 11.9 h of daylight per day on average.
The month with the most sunshine per day is August (Average sunshine: 6.2 h). The month with the least sunshine per day is January (Average sunshine: 4 h). Over the whole year there are 5.2 h of sunlight per day on average.
The month with the highest average UV index is July (UV index: 11). The months with the lowest average UV index are January and December (UV index: 3). Over the whole year the average UV index is 6.8.
