Shimonoseki, Yamaguchi Weather by Month and Climate Averages

How much rain does Shimonoseki get?

Shimonoseki gets 1562 mm of precipitation in an average year, spread over about 108 days with measurable rain. That is fewer rainy days than 56% of Japan.

July is the wettest month, with 286 mm. December is the driest, with 62 mm. July has the most rainy days, about 11.

The longest dry spell in the last five years lasted 18 days, to November 12, 2022.

Shimonoseki weather by month

Shimonoseki weather in January

In January, Shimonoseki averages a high of 10°C and a low of 4°C. It gets 71 mm of precipitation over about 10 rainy days. The sun is out about 34% of daylight hours. The January record high is 18°C (2026) and the record low is -6°C (1970).

Shimonoseki weather in February

In February, Shimonoseki averages a high of 11°C and a low of 4°C. It gets 68 mm of precipitation over about 9 rainy days. The sun is out about 36% of daylight hours. The February record high is 24°C (2021) and the record low is -7°C (1977).

Shimonoseki weather in March

In March, Shimonoseki averages a high of 14°C and a low of 7°C. It gets 113 mm of precipitation over about 10 rainy days. The sun is out about 39% of daylight hours. The March record high is 27°C (1979) and the record low is -4°C (1977).

Shimonoseki weather in April

In April, Shimonoseki averages a high of 18°C and a low of 11°C. It gets 119 mm of precipitation over about 9 rainy days. The sun is out about 42% of daylight hours. The April record high is 29°C (1983) and the record low is 1°C (1972). April is one of the most comfortable months to visit.

Shimonoseki weather in May

In May, Shimonoseki averages a high of 23°C and a low of 16°C. It gets 133 mm of precipitation over about 8 rainy days. The sun is out about 37% of daylight hours. The May record high is 31°C (2000) and the record low is 8°C (1971). May is one of the most comfortable months to visit.

Shimonoseki weather in June

In June, Shimonoseki averages a high of 26°C and a low of 20°C. It gets 232 mm of precipitation over about 11 rainy days. The sun is out about 28% of daylight hours. The June record high is 35°C (2022) and the record low is 12°C (1978). June is one of the most comfortable months to visit.

Shimonoseki weather in July

In July, Shimonoseki averages a high of 30°C and a low of 24°C. It gets 286 mm of precipitation over about 11 rainy days. The sun is out about 29% of daylight hours. The July record high is 36°C (1994) and the record low is 18°C (1982).

Shimonoseki weather in August

In August, Shimonoseki averages a high of 31°C and a low of 26°C. It gets 171 mm of precipitation over about 9 rainy days. The sun is out about 43% of daylight hours. The August record high is 37°C (2026) and the record low is 18°C (1977).

Shimonoseki weather in September

In September, Shimonoseki averages a high of 28°C and a low of 22°C. It gets 154 mm of precipitation over about 9 rainy days. The sun is out about 41% of daylight hours. The September record high is 35°C (1983) and the record low is 13°C (1987).

Shimonoseki weather in October

In October, Shimonoseki averages a high of 23°C and a low of 17°C. It gets 81 mm of precipitation over about 6 rainy days. The sun is out about 52% of daylight hours. The October record high is 31°C (2016) and the record low is 8°C (1980). October is one of the most comfortable months to visit.

Shimonoseki weather in November

In November, Shimonoseki averages a high of 18°C and a low of 11°C. It gets 72 mm of precipitation over about 8 rainy days. The sun is out about 49% of daylight hours. The November record high is 27°C (2015) and the record low is 2°C (1970). November is one of the most comfortable months to visit.

Shimonoseki weather in December

In December, Shimonoseki averages a high of 12°C and a low of 7°C. It gets 62 mm of precipitation over about 9 rainy days. The sun is out about 37% of daylight hours. The December record high is 26°C (2018) and the record low is -3°C (1973).

Sunshine, humidity and wind in Shimonoseki

October is the sunniest month in Shimonoseki, with sunshine about 52% of daylight hours. June is the cloudiest, at 28%. Over the year the sun shines about 39% of daylight hours. Shimonoseki is sunnier than 59% of Japan.

Humidity peaks in June at 85% and is lowest in December at 65%.

Shimonoseki has about 16 days a year above 32°C. Shimonoseki is cooler than 58% of Japan.

Shimonoseki weather records

The hottest temperature on record at the Shimonoseki station is 37°C, on August 3, 2026. The coldest is -7°C, on February 16, 1977.

The wettest day on record brought 219 mm of rain, on September 14, 1990.

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

The best time to visit Shimonoseki

The most comfortable time to visit is typically April to June and October to November, when daytime highs sit near 21°C.

Winter (December–February) is chilly, with average highs around 11°C and lows near 5°C.

Spring (March–May) is mild, with average highs around 18°C and lows near 11°C.

Summer (June–August) is hot, with average highs around 29°C and lows near 23°C. It can feel humid.

Autumn (September–November) is warm, with average highs around 23°C and lows near 17°C.

Shimonoseki climate questions

How much rain does Shimonoseki get?

Shimonoseki gets 1562 mm of precipitation in an average year, over about 108 rainy days.

What is the wettest month in Shimonoseki?

July is the wettest month in Shimonoseki, with 286 mm. December is the driest, with 62 mm.

How many rainy days does Shimonoseki have a year?

Shimonoseki has about 108 days with measurable rain in an average year. July has the most, about 11.

What is the hottest month in Shimonoseki?

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

What is the coldest month in Shimonoseki?

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

What is the record high temperature in Shimonoseki?

The record high at the Shimonoseki station is 37°C, set on August 3, 2026. The record low is -7°C, on February 16, 1977.

What is the sunniest month in Shimonoseki?

October is the sunniest month in Shimonoseki, with sunshine about 52% of daylight hours. June is the cloudiest.

What is the best time to visit Shimonoseki?

The most comfortable time to visit is typically April to June and October to November, when daytime highs sit near 21°C.