Unzen Temperature by Month

Unzen, Nagasaki, Japan has an average annual maximum temperature of 22°C (72°F), ranging from 11°C (52°F) in January to 32°C (90°F) in August. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

In Unzen, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 25°C (77°F) in August to 5°C (41°F) in January.

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

From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. August, the warmest month, averages 209 hours of sunshine.

The chart below shows the average temperature throughout the year:

Unzen's average annual maximum temperature is 22°C (72°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

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

Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

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 Unzen, January is the coolest month, with average highs of 11°C (52°F) and humidity around 66%, considered high. In August, the warmest month, temperatures average 32°C (90°F) with 77% 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 Unzen's weather, including monthly rainfall, sunshine hours, and humidity, visit our Unzen climate page.