Hiroshima Temperature by Month

Hiroshima in Hiroshima, Japan sees significant seasonal temperature differences, with daytime highs between 10°C (50°F) in January and 32°C (90°F) in August, averaging 21°C (70°F) annually. Explore the full monthly breakdown below.

Depending on the time of the year, temperatures range from very warm to cold in Hiroshima. At night, minimum temperatures range from 24°C (75°F) in August to 2°C (36°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Hiroshima by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. August, the warmest month, sees 209 hours of sunshine.

The chart below shows the average temperature throughout the year:

Hiroshima's average annual maximum temperature is 21°C (70°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Hiroshima, January is the coolest month, with average highs of 10°C (50°F) and humidity around 66%, considered high. In August, the warmest month, temperatures average 32°C (90°F) with 68% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Hiroshima's weather, including monthly rainfall, sunshine hours, and humidity, visit our Hiroshima climate page.