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Shimonoseki, Yamaguchi Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Shimonoseki, Yamaguchi?
Shimonoseki, Yamaguchi gets 1562 mm of precipitation a year over about 108 rainy days. August is the warmest month (average high 31°C) and January the coldest (average low 4°C).
Humid subtropical climate
Shimonoseki, Yamaguchi has hot summers and chilly winters. Daytime highs range from about 10°C in January to 31°C in August. July is usually the wettest month. The most comfortable time to visit is typically April to June and October to November, when daytime highs sit near 21°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 5° | 11° |
| Spring | Mar–May | 11° | 18° |
| Summer | Jun–Aug | 23° | 29° |
| Autumn | Sep–Nov | 17° | 23° |
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.
From October 2025 to September 2026 Shimonoseki got 1738 mm of rain, against a normal of 1562 mm for those months. September 2026 had the most, with 791 mm.
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. Estimated sunshine is 34% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 28% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 29% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 52% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 49% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. 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 estimated sunshine of 52% of daylight hours from ERA5 cloud cover. June is the cloudiest, at 28%. The annual cloud-cover estimate is 39% of daylight hours; it is not a measurement of sunshine duration. 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
These records cover SHIMONOSEKI during 1970–2026. Earlier records or other stations in the city may differ.
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 in the available station history brought 219 mm of precipitation, 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.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 4° | 10° | 71 mm | 10 | 67% | 34% | 18° | -6° |
| February | 4° | 11° | 68 mm | 9 | 68% | 36% | 24° | -7° |
| March | 7° | 14° | 113 mm | 10 | 72% | 39% | 27° | -4° |
| April | 11° | 18° | 119 mm | 9 | 74% | 42% | 29° | 1° |
| May | 16° | 23° | 133 mm | 8 | 79% | 37% | 31° | 8° |
| June | 20° | 26° | 232 mm | 11 | 85% | 28% | 35° | 12° |
| July | 24° | 30° | 286 mm | 11 | 85% | 29% | 36° | 18° |
| August | 26° | 31° | 171 mm | 9 | 83% | 43% | 37° | 18° |
| September | 22° | 28° | 154 mm | 9 | 78% | 41% | 35° | 13° |
| October | 17° | 23° | 81 mm | 6 | 69% | 52% | 31° | 8° |
| November | 11° | 18° | 72 mm | 8 | 67% | 49% | 27° | 2° |
| December | 7° | 12° | 62 mm | 9 | 65% | 37% | 26° | -3° |
Station: SHIMONOSEKI, 1 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
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?
Within the available 1970–2026 station history, 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 estimated sunshine of 52% of daylight hours from ERA5 cloud cover. 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.