Nozawa Onsen Temperature by Month

The average annual maximum temperature in Nozawa Onsen, Nagano Prefecture, Japan is 16°C (61°F), with daytime highs ranging from 3°C (37°F) in January to 29°C (84°F) in August. This page covers monthly averages, day-night differences, and how Nozawa Onsen compares to cities worldwide.

With significant temperature fluctuations, Nozawa Onsen enjoys distinct seasons year-round. Nighttime lows range from 20°C (68°F) in August to -5°C (23°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Nozawa Onsen 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 197 hours of sunshine.

The chart below shows the average temperature throughout the year:

Nozawa Onsen's average annual maximum temperature is 16°C (61°F). To put that in context, here's how it compares to a few well-known destinations:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

Queenstown, New Zealand averages 10°C (50°F) annually, remember seasons are flipped, so its coldest months fall in June and July.

Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

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 Nozawa Onsen, January is the coolest month, with average highs of 3°C (37°F) and humidity around 78%, considered high. In August, the warmest month, temperatures average 29°C (84°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.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

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