Kumamoto, Kumamoto Weather by Month and Climate Averages

How much rain does Kumamoto get?

Kumamoto gets 1856 mm of precipitation in an average year, spread over about 109 days with measurable rain. That is fewer rainy days than 55% of Japan.

June is the wettest month, with 414 mm. January is the driest, with 53 mm. June has the most rainy days, about 14.

The longest dry spell in the last five years lasted 32 days, to October 24, 2021.

Kumamoto weather by month

Kumamoto weather in January

In January, Kumamoto averages a high of 11°C and a low of 1°C. It gets 53 mm of precipitation over about 7 rainy days. The sun is out about 42% of daylight hours. The January record high is 22°C (1980) and the record low is -8°C (1970).

Kumamoto weather in February

In February, Kumamoto averages a high of 12°C and a low of 2°C. It gets 79 mm of precipitation over about 8 rainy days. The sun is out about 40% of daylight hours. The February record high is 24°C (2021) and the record low is -8°C (1977).

Kumamoto weather in March

In March, Kumamoto averages a high of 16°C and a low of 5°C. It gets 114 mm of precipitation over about 10 rainy days. The sun is out about 38% of daylight hours. The March record high is 27°C (2023) and the record low is -4°C (1984).

Kumamoto weather in April

In April, Kumamoto averages a high of 21°C and a low of 10°C. It gets 136 mm of precipitation over about 9 rainy days. The sun is out about 37% of daylight hours. The April record high is 31°C (1998) and the record low is -2°C (1972). April is one of the most comfortable months to visit.

Kumamoto weather in May

In May, Kumamoto averages a high of 26°C and a low of 15°C. It gets 142 mm of precipitation over about 9 rainy days. The sun is out about 31% of daylight hours. The May record high is 34°C (2000) and the record low is 4°C (1971). May is one of the most comfortable months to visit.

Kumamoto weather in June

In June, Kumamoto averages a high of 28°C and a low of 20°C. It gets 414 mm of precipitation over about 14 rainy days. The sun is out about 19% of daylight hours. The June record high is 36°C (2004) and the record low is 11°C (1981).

Kumamoto weather in July

In July, Kumamoto averages a high of 32°C and a low of 24°C. It gets 367 mm of precipitation over about 13 rainy days. The sun is out about 24% of daylight hours. The July record high is 39°C (1994) and the record low is 17°C (1982).

Kumamoto weather in August

In August, Kumamoto averages a high of 33°C and a low of 24°C. It gets 177 mm of precipitation over about 10 rainy days. The sun is out about 41% of daylight hours. The August record high is 39°C (2024) and the record low is 17°C (2019).

Kumamoto weather in September

In September, Kumamoto averages a high of 30°C and a low of 21°C. It gets 160 mm of precipitation over about 9 rainy days. The sun is out about 39% of daylight hours. The September record high is 37°C (2010) and the record low is 9°C (1973).

Kumamoto weather in October

In October, Kumamoto averages a high of 25°C and a low of 14°C. It gets 86 mm of precipitation over about 6 rainy days. The sun is out about 54% of daylight hours. The October record high is 34°C (2005) and the record low is 1°C (1970). October is one of the most comfortable months to visit.

Kumamoto weather in November

In November, Kumamoto averages a high of 19°C and a low of 8°C. It gets 72 mm of precipitation over about 7 rainy days. The sun is out about 50% of daylight hours. The November record high is 30°C (2023) and the record low is -3°C (1971). November is one of the most comfortable months to visit.

Kumamoto weather in December

In December, Kumamoto averages a high of 13°C and a low of 3°C. It gets 58 mm of precipitation over about 7 rainy days. The sun is out about 47% of daylight hours. The December record high is 24°C (2018) and the record low is -6°C (1973).

Sunshine, humidity and wind in Kumamoto

October is the sunniest month in Kumamoto, with sunshine about 54% of daylight hours. June is the cloudiest, at 19%. Over the year the sun shines about 39% of daylight hours. Kumamoto is sunnier than 55% of Japan.

Humidity peaks in July at 81% and is lowest in April at 68%.

Kumamoto has about 45 days a year above 32°C. Kumamoto is hotter than 99% of Japan.

First and last freeze in Kumamoto

The first fall freeze in Kumamoto typically comes around December 7, and the last spring freeze around March 10. That leaves a frost-free growing season of about 272 days.

Kumamoto weather records

The hottest temperature on record at the Kumamoto station is 39°C, on July 16, 1994. The coldest is -8°C, on January 18, 1970.

The wettest day on record brought 394 mm of rain, on July 24, 1982.

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

The best time to visit Kumamoto

The most comfortable time to visit is typically April to May and October to November, when daytime highs sit near 23°C.

Winter (December–February) is chilly, with average highs around 12°C and lows near 2°C.

Spring (March–May) is warm, with average highs around 21°C and lows near 10°C.

Summer (June–August) is hot, with average highs around 31°C and lows near 23°C. It can feel humid.

Autumn (September–November) is warm, with average highs around 25°C and lows near 14°C.

Kumamoto climate questions

How much rain does Kumamoto get?

Kumamoto gets 1856 mm of precipitation in an average year, over about 109 rainy days.

What is the wettest month in Kumamoto?

June is the wettest month in Kumamoto, with 414 mm. January is the driest, with 53 mm.

How many rainy days does Kumamoto have a year?

Kumamoto has about 109 days with measurable rain in an average year. June has the most, about 14.

What is the hottest month in Kumamoto?

August is the warmest month in Kumamoto, with an average high of 33°C.

What is the coldest month in Kumamoto?

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

What is the record high temperature in Kumamoto?

The record high at the Kumamoto station is 39°C, set on July 16, 1994. The record low is -8°C, on January 18, 1970.

What is the sunniest month in Kumamoto?

October is the sunniest month in Kumamoto, with sunshine about 54% of daylight hours. June is the cloudiest.

When is the first frost in Kumamoto?

The first fall freeze in Kumamoto typically comes around December 7. The last spring freeze is around March 10.

What is the best time to visit Kumamoto?

The most comfortable time to visit is typically April to May and October to November, when daytime highs sit near 23°C.