Karatsu, Saga Weather by Month and Climate Averages

How much rain does Karatsu get?

Karatsu gets 1765 mm of precipitation in an average year, spread over about 105 days with measurable rain. That is fewer rainy days than 62% of Japan.

July is the wettest month, with 341 mm. January is the driest, with 51 mm. June has the most rainy days, about 12.

The longest dry spell in the last five years lasted 23 days, to October 15, 2021.

Karatsu weather by month

Karatsu weather in January

In January, Karatsu averages a high of 10°C and a low of 1°C. It gets 51 mm of precipitation over about 8 rainy days. The sun is out about 34% of daylight hours. The January record high is 21°C (1980) and the record low is -7°C (2016).

Karatsu weather in February

In February, Karatsu averages a high of 12°C and a low of 2°C. It gets 68 mm of precipitation over about 8 rainy days. The sun is out about 36% of daylight hours. The February record high is 23°C (2004) and the record low is -6°C (1977).

Karatsu weather in March

In March, Karatsu averages a high of 16°C and a low of 4°C. It gets 105 mm of precipitation over about 10 rainy days. The sun is out about 37% of daylight hours. The March record high is 26°C (2023) and the record low is -4°C (1977).

Karatsu weather in April

In April, Karatsu averages a high of 21°C and a low of 9°C. It gets 147 mm of precipitation over about 8 rainy days. The sun is out about 39% of daylight hours. The April record high is 31°C (1998) and the record low is -1°C (1972). April is one of the most comfortable months to visit.

Karatsu weather in May

In May, Karatsu averages a high of 26°C and a low of 14°C. It gets 167 mm of precipitation over about 8 rainy days. The sun is out about 36% of daylight hours. The May record high is 36°C (2000) and the record low is 7°C (1971). May is one of the most comfortable months to visit.

Karatsu weather in June

In June, Karatsu averages a high of 28°C and a low of 19°C. It gets 300 mm of precipitation over about 12 rainy days. The sun is out about 25% of daylight hours. The June record high is 37°C (2004) and the record low is 11°C (1972).

Karatsu weather in July

In July, Karatsu averages a high of 32°C and a low of 24°C. It gets 341 mm of precipitation over about 12 rainy days. The sun is out about 25% of daylight hours. The July record high is 39°C (1994) and the record low is 16°C (1982).

Karatsu weather in August

In August, Karatsu averages a high of 33°C and a low of 24°C. It gets 210 mm of precipitation over about 10 rainy days. The sun is out about 43% of daylight hours. The August record high is 39°C (2026) and the record low is 18°C (1972).

Karatsu weather in September

In September, Karatsu averages a high of 29°C and a low of 21°C. It gets 156 mm of precipitation over about 9 rainy days. The sun is out about 42% of daylight hours. The September record high is 37°C (2024) and the record low is 9°C (1987).

Karatsu weather in October

In October, Karatsu averages a high of 24°C and a low of 14°C. It gets 88 mm of precipitation over about 6 rainy days. The sun is out about 53% of daylight hours. The October record high is 33°C (2016) and the record low is 3°C (1970). October is one of the most comfortable months to visit.

Karatsu weather in November

In November, Karatsu averages a high of 18°C and a low of 8°C. It gets 75 mm of precipitation over about 7 rainy days. The sun is out about 48% of daylight hours. The November record high is 29°C (2023) and the record low is -1°C (1976). November is one of the most comfortable months to visit.

Karatsu weather in December

In December, Karatsu averages a high of 12°C and a low of 3°C. It gets 55 mm of precipitation over about 7 rainy days. The sun is out about 36% of daylight hours. The December record high is 24°C (2018) and the record low is -4°C (1973).

Sunshine, humidity and wind in Karatsu

October is the sunniest month in Karatsu, with sunshine about 53% of daylight hours. June is the cloudiest, at 25%. Over the year the sun shines about 38% of daylight hours. Karatsu is cloudier than 54% of Japan.

Humidity peaks in July at 84% and is lowest in December at 65%.

Karatsu has about 39 days a year above 32°C. Karatsu is hotter than 94% of Japan.

First and last freeze in Karatsu

The first fall freeze in Karatsu typically comes around December 17, and the last spring freeze around March 4. That leaves a frost-free growing season of about 288 days.

Karatsu weather records

The hottest temperature on record at the Karatsu station is 39°C, on July 16, 1994. The coldest is -7°C, on January 25, 2016.

The wettest day on record brought 336 mm of rain, on August 13, 2021.

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

The best time to visit Karatsu

The most comfortable time to visit is typically April to May and October to November, when daytime highs sit near 22°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 24°C and lows near 14°C.

Karatsu climate questions

How much rain does Karatsu get?

Karatsu gets 1765 mm of precipitation in an average year, over about 105 rainy days.

What is the wettest month in Karatsu?

July is the wettest month in Karatsu, with 341 mm. January is the driest, with 51 mm.

How many rainy days does Karatsu have a year?

Karatsu has about 105 days with measurable rain in an average year. June has the most, about 12.

What is the hottest month in Karatsu?

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

What is the coldest month in Karatsu?

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

What is the record high temperature in Karatsu?

The record high at the Karatsu station is 39°C, set on July 16, 1994. The record low is -7°C, on January 25, 2016.

What is the sunniest month in Karatsu?

October is the sunniest month in Karatsu, with sunshine about 53% of daylight hours. June is the cloudiest.

When is the first frost in Karatsu?

The first fall freeze in Karatsu typically comes around December 17. The last spring freeze is around March 4.

What is the best time to visit Karatsu?

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