Nagano, Nagano Weather by Month and Climate Averages

How much rain does Nagano get?

Nagano gets 886 mm of precipitation in an average year, spread over about 115 days with measurable rain. That is more rainy days than 50% of Japan.

July is the wettest month, with 124 mm. November is the driest, with 38 mm. January has the most rainy days, about 12.

The longest dry spell in the last five years lasted 17 days, to November 6, 2023.

Nagano weather by month

Nagano weather in January

In January, Nagano averages a high of 4°C and a low of -4°C. It gets 52 mm of precipitation over about 12 rainy days. The sun is out about 29% of daylight hours. The January record high is 16°C (1982) and the record low is -13°C (1970).

Nagano weather in February

In February, Nagano averages a high of 6°C and a low of -4°C. It gets 48 mm of precipitation over about 10 rainy days. The sun is out about 31% of daylight hours. The February record high is 21°C (2010) and the record low is -13°C (1977).

Nagano weather in March

In March, Nagano averages a high of 11°C and a low of -1°C. It gets 55 mm of precipitation over about 10 rainy days. The sun is out about 35% of daylight hours. The March record high is 28°C (2025) and the record low is -9°C (1977).

Nagano weather in April

In April, Nagano averages a high of 17°C and a low of 4°C. It gets 57 mm of precipitation over about 9 rainy days. The sun is out about 38% of daylight hours. The April record high is 31°C (2004) and the record low is -5°C (1987). April is one of the most comfortable months to visit.

Nagano weather in May

In May, Nagano averages a high of 23°C and a low of 10°C. It gets 64 mm of precipitation over about 8 rainy days. The sun is out about 32% of daylight hours. The May record high is 34°C (2019) and the record low is 1°C (1972). May is one of the most comfortable months to visit.

Nagano weather in June

In June, Nagano averages a high of 26°C and a low of 16°C. It gets 97 mm of precipitation over about 10 rainy days. The sun is out about 24% of daylight hours. The June record high is 36°C (2022) and the record low is 6°C (1978). June is one of the most comfortable months to visit.

Nagano weather in July

In July, Nagano averages a high of 30°C and a low of 20°C. It gets 124 mm of precipitation over about 12 rainy days. The sun is out about 22% of daylight hours. The July record high is 37°C (2022) and the record low is 12°C (1976).

Nagano weather in August

In August, Nagano averages a high of 31°C and a low of 21°C. It gets 94 mm of precipitation over about 9 rainy days. The sun is out about 30% of daylight hours. The August record high is 39°C (1994) and the record low is 12°C (1971).

Nagano weather in September

In September, Nagano averages a high of 26°C and a low of 17°C. It gets 114 mm of precipitation over about 9 rainy days. The sun is out about 27% of daylight hours. The September record high is 36°C (2002) and the record low is 7°C (1992). September is one of the most comfortable months to visit.

Nagano weather in October

In October, Nagano averages a high of 19°C and a low of 9°C. It gets 100 mm of precipitation over about 7 rainy days. The sun is out about 32% of daylight hours. The October record high is 31°C (1998) and the record low is -2°C (1983). October is one of the most comfortable months to visit.

Nagano weather in November

In November, Nagano averages a high of 13°C and a low of 3°C. It gets 38 mm of precipitation over about 7 rainy days. The sun is out about 40% of daylight hours. The November record high is 26°C (1977) and the record low is -4°C (1973).

Nagano weather in December

In December, Nagano averages a high of 7°C and a low of -2°C. It gets 44 mm of precipitation over about 10 rainy days. The sun is out about 33% of daylight hours. The December record high is 22°C (2018) and the record low is -11°C (1973).

Sunshine, humidity and wind in Nagano

November is the sunniest month in Nagano, with sunshine about 40% of daylight hours. July is the cloudiest, at 22%. Over the year the sun shines about 31% of daylight hours. Nagano is cloudier than 95% of Japan.

Humidity peaks in July at 81% and is lowest in April at 64%.

Nagano has about 23 days a year above 32°C. Nagano is hotter than 59% of Japan.

First and last freeze in Nagano

The first fall freeze in Nagano typically comes around November 15, and the last spring freeze around April 10. That leaves a frost-free growing season of about 219 days.

Nagano weather records

The hottest temperature on record at the Nagano station is 39°C, on August 16, 1994. The coldest is -13°C, on February 1, 1977.

The wettest day on record brought 228 mm of rain, on July 30, 1994.

40 all-time records have been set at the station since 1970.

The best time to visit Nagano

The most comfortable time to visit is typically April to June and September to October, when daytime highs sit near 22°C.

Winter (December–February) is chilly, with average highs around 5°C and lows near -4°C.

Spring (March–May) is mild, with average highs around 17°C and lows near 4°C.

Summer (June–August) is hot, with average highs around 29°C and lows near 19°C. It can feel humid.

Autumn (September–November) is mild, with average highs around 20°C and lows near 10°C.

Nagano climate questions

How much rain does Nagano get?

Nagano gets 886 mm of precipitation in an average year, over about 115 rainy days.

What is the wettest month in Nagano?

July is the wettest month in Nagano, with 124 mm. November is the driest, with 38 mm.

How many rainy days does Nagano have a year?

Nagano has about 115 days with measurable rain in an average year. January has the most, about 12.

What is the hottest month in Nagano?

August is the warmest month in Nagano, with an average high of 31°C.

What is the coldest month in Nagano?

January is the coldest month in Nagano, with an average low of -4°C.

What is the record high temperature in Nagano?

The record high at the Nagano station is 39°C, set on August 16, 1994. The record low is -13°C, on February 1, 1977.

What is the sunniest month in Nagano?

November is the sunniest month in Nagano, with sunshine about 40% of daylight hours. July is the cloudiest.

When is the first frost in Nagano?

The first fall freeze in Nagano typically comes around November 15. The last spring freeze is around April 10.

What is the best time to visit Nagano?

The most comfortable time to visit is typically April to June and September to October, when daytime highs sit near 22°C.