Sasebo Temperature by Month
The average annual maximum temperature in Sasebo, Nagasaki, Japan is 21°C (70°F), with daytime highs ranging from 11°C (52°F) in January to 31°C (88°F) in August. This page covers monthly averages, day-night differences, and how Sasebo compares to cities worldwide.
Sasebo Monthly Temperatures
Visitors to Sasebo will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 26°C (79°F) in August to 5°C (41°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Sasebo 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:
Temperature: Sasebo vs Japan
The map below shows the annual temperature across Japan. You can also select individual months if you want to compare a specific time of year.
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Sasebo vs World: Temperature Compared
Sasebo'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.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
Beijing, China averages 20°C (68°F) annually, but with big seasonal swings — very cold winters and hot summers.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
What Does the Temperature Feel Like in Sasebo?
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 Sasebo, 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 31°C (88°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 Sasebo's weather — including monthly rainfall, sunshine hours, and humidity — visit our Sasebo climate page.
