Jōetsu, Niigata Weather by Month and Climate Averages

How much rain does Jōetsu get?

Jōetsu gets 2575 mm of precipitation in an average year, spread over about 176 days with measurable rain. That is more rainy days than 97% of Japan.

December is the wettest month, with 436 mm. May is the driest, with 77 mm. January has the most rainy days, about 23.

The longest dry spell in the last five years lasted 18 days, to August 15, 2023.

Jōetsu weather by month

Jōetsu weather in January

In January, Jōetsu averages a high of 6°C and a low of -1°C. It gets 405 mm of precipitation over about 23 rainy days. The sun is out about 24% of daylight hours. The January record high is 18°C (2000) and the record low is -9°C (1985).

Jōetsu weather in February

In February, Jōetsu averages a high of 7°C and a low of -1°C. It gets 243 mm of precipitation over about 19 rainy days. The sun is out about 29% of daylight hours. The February record high is 22°C (2024) and the record low is -10°C (1978).

Jōetsu weather in March

In March, Jōetsu averages a high of 11°C and a low of 1°C. It gets 173 mm of precipitation over about 17 rainy days. The sun is out about 35% of daylight hours. The March record high is 29°C (2025) and the record low is -7°C (1984).

Jōetsu weather in April

In April, Jōetsu averages a high of 18°C and a low of 6°C. It gets 92 mm of precipitation over about 12 rainy days. The sun is out about 41% of daylight hours. The April record high is 32°C (1987) and the record low is -4°C (1972). April is one of the most comfortable months to visit.

Jōetsu weather in May

In May, Jōetsu averages a high of 23°C and a low of 11°C. It gets 77 mm of precipitation over about 9 rainy days. The sun is out about 37% of daylight hours. The May record high is 33°C (2006) and the record low is 1°C (1972). May is one of the most comfortable months to visit.

Jōetsu weather in June

In June, Jōetsu averages a high of 26°C and a low of 16°C. It gets 125 mm of precipitation over about 11 rainy days. The sun is out about 32% of daylight hours. The June record high is 37°C (1978) and the record low is 8°C (1978). June is one of the most comfortable months to visit.

Jōetsu weather in July

In July, Jōetsu averages a high of 29°C and a low of 21°C. It gets 191 mm of precipitation over about 13 rainy days. The sun is out about 29% of daylight hours. The July record high is 38°C (2015) and the record low is 13°C (1979).

Jōetsu weather in August

In August, Jōetsu averages a high of 31°C and a low of 22°C. It gets 156 mm of precipitation over about 10 rainy days. The sun is out about 36% of daylight hours. The August record high is 41°C (2019) and the record low is 13°C (1971).

Jōetsu weather in September

In September, Jōetsu averages a high of 27°C and a low of 18°C. It gets 183 mm of precipitation over about 13 rainy days. The sun is out about 33% of daylight hours. The September record high is 39°C (2020) and the record low is 9°C (1976).

Jōetsu weather in October

In October, Jōetsu averages a high of 21°C and a low of 11°C. It gets 195 mm of precipitation over about 12 rainy days. The sun is out about 35% of daylight hours. The October record high is 34°C (2018) and the record low is 3°C (1970). October is one of the most comfortable months to visit.

Jōetsu weather in November

In November, Jōetsu averages a high of 16°C and a low of 6°C. It gets 297 mm of precipitation over about 16 rainy days. The sun is out about 39% of daylight hours. The November record high is 28°C (2020) and the record low is -2°C (2017).

Jōetsu weather in December

In December, Jōetsu averages a high of 9°C and a low of 2°C. It gets 436 mm of precipitation over about 21 rainy days. The sun is out about 26% of daylight hours. The December record high is 23°C (1982) and the record low is -7°C (1976).

Sunshine, humidity and wind in Jōetsu

April is the sunniest month in Jōetsu, with sunshine about 41% of daylight hours. January is the cloudiest, at 24%. Over the year the sun shines about 33% of daylight hours. Jōetsu is cloudier than 89% of Japan.

Humidity peaks in July at 82% and is lowest in March at 70%.

Jōetsu has about 23 days a year above 32°C. Jōetsu is hotter than 61% of Japan.

First and last freeze in Jōetsu

The first fall freeze in Jōetsu typically comes around December 6, and the last spring freeze around March 31. That leaves a frost-free growing season of about 250 days.

Jōetsu weather records

The hottest temperature on record at the Jōetsu station is 41°C, on August 14, 2019. The coldest is -10°C, on February 17, 1978.

The wettest day on record brought 176 mm of rain, on July 8, 1985.

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

The best time to visit Jōetsu

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

Winter (December–February) is chilly, with average highs around 7°C and lows near 0°C.

Spring (March–May) is mild, with average highs around 17°C and lows near 6°C.

Summer (June–August) is hot, with average highs around 29°C and lows near 20°C. It can feel humid.

Autumn (September–November) is warm, with average highs around 21°C and lows near 12°C.

Jōetsu climate questions

How much rain does Jōetsu get?

Jōetsu gets 2575 mm of precipitation in an average year, over about 176 rainy days.

What is the wettest month in Jōetsu?

December is the wettest month in Jōetsu, with 436 mm. May is the driest, with 77 mm.

How many rainy days does Jōetsu have a year?

Jōetsu has about 176 days with measurable rain in an average year. January has the most, about 23.

What is the hottest month in Jōetsu?

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

What is the coldest month in Jōetsu?

January is the coldest month in Jōetsu, with an average low of -1°C.

What is the record high temperature in Jōetsu?

The record high at the Jōetsu station is 41°C, set on August 14, 2019. The record low is -10°C, on February 17, 1978.

What is the sunniest month in Jōetsu?

April is the sunniest month in Jōetsu, with sunshine about 41% of daylight hours. January is the cloudiest.

When is the first frost in Jōetsu?

The first fall freeze in Jōetsu typically comes around December 6. The last spring freeze is around March 31.

What is the best time to visit Jōetsu?

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