Nagano Prefecture Weather by Month — Temperature & Rainfall Guide

Nagano Prefecture is a region in Japan. Many people wonder what the weather conditions are in Nagano Prefecture over the year. What is the best time to visit Nagano Prefecture?

This page shows the average weather conditions by month in Nagano Prefecture over the year in: January, February, March, April, May, June, July, August, September, October, November, December.

In January the weather in Nagano Prefecture is generally poor. January is a winter month. The temperatures range from very low in Omachi with -1°C (30°F) to low in Achi with 4°C (39°F). On average, this month is one of the coldest months of the year in Nagano Prefecture. So be prepared and make sure to dress up warm.

Find more detailed climate information for Nagano Prefecture in January here.

In February the weather in Nagano Prefecture is generally poor. February is a winter month. The temperatures range from very low in Omachi with 0°C (32°F) to low in Achi with 5°C (41°F). It is a very cold month in some areas, so be prepared and make sure to dress up warm.

Find more detailed climate information for Nagano Prefecture in February here.

In March the weather in Nagano Prefecture is generally poor. The average maximum daytime temperatures are low and range from 5°C (41°F) in Omachi to 9°C (48°F) in Achi.

Find more detailed climate information for Nagano Prefecture in March here.

In April the weather in Nagano Prefecture ranges from poor in Hakuba to unpleasant in Matsumoto. The temperatures range from low in Omachi with 11°C (52°F) to moderate in Ueda with 16°C (61°F).

Find more detailed climate information for Nagano Prefecture in April here.

In May the weather in Nagano Prefecture ranges from poor in Hakuba to pleasant in Yamanouchi. The temperatures range from moderate in Omachi with 18°C (64°F) to pleasant in Ueda with 21°C (70°F).

Find more detailed climate information for Nagano Prefecture in May here.

In June the weather in Nagano Prefecture ranges from poor in Hakuba to pleasant in Tateshina. The temperatures range from pleasant in Omachi with 21°C (70°F) to high in Ueda with 24°C (75°F).

Find more detailed climate information for Nagano Prefecture in June here.

In July the weather in Nagano Prefecture ranges from poor in Hakuba to pleasant in Tateshina. July is a summer month. The average maximum daytime temperatures are high and range from 25°C (77°F) in Omachi to 28°C (82°F) in Ueda.

Find more detailed climate information for Nagano Prefecture in July here.

In August the weather in Nagano Prefecture ranges from poor in Hakuba to pleasant in Matsumoto. August is a summer month. The average maximum daytime temperatures are high and range from 26°C (79°F) in Omachi to 29°C (84°F) in Ueda. On average, this month is one of the warmest months of the year in Nagano Prefecture. So be prepared and make sure to dress lightly.

Find more detailed climate information for Nagano Prefecture in August here.

In September the weather in Nagano Prefecture ranges from poor in Hakuba to pleasant in Chino. September is a summer month. The average maximum daytime temperatures are high and range from 22°C (72°F) in Omachi to 25°C (77°F) in Ueda.

Find more detailed climate information for Nagano Prefecture in September here.

In October the weather in Nagano Prefecture ranges from poor in Hakuba to tolerable in Karuizawa. The temperatures range from moderate in Omachi with 16°C (61°F) to pleasant in Achi with 19°C (66°F).

Find more detailed climate information for Nagano Prefecture in October here.

In November the weather in Nagano Prefecture ranges from poor in Hakuba to unpleasant in Karuizawa. The temperatures range from low in Omachi with 9°C (48°F) to moderate in Achi with 13°C (55°F).

Find more detailed climate information for Nagano Prefecture in November here.

In December the weather in Nagano Prefecture is generally poor. December is a winter month. The average maximum daytime temperatures are low and range from 2°C (36°F) in Omachi to 7°C (45°F) in Achi. It is a very cold month in some areas, so be prepared and make sure to dress up warm.

Find more detailed climate information for Nagano Prefecture in December here.