Isahaya, Nagasaki Weather by Month and Climate Averages

How much rain does Isahaya get?

Isahaya gets 1830 mm of precipitation in an average year, spread over about 115 days with measurable rain. That is more rainy days than 51% of Japan.

June is the wettest month, with 326 mm. January is the driest, with 59 mm. June has the most rainy days, about 14.

The longest dry spell in the last five years lasted 21 days, to November 12, 2022.

Isahaya weather by month

Isahaya weather in January

In January, Isahaya averages a high of 11°C and a low of 3°C. It gets 59 mm of precipitation over about 10 rainy days. The sun is out about 39% of daylight hours. The January record high is 21°C (2002) and the record low is -4°C (1970).

Isahaya weather in February

In February, Isahaya averages a high of 12°C and a low of 4°C. It gets 76 mm of precipitation over about 9 rainy days. The sun is out about 39% of daylight hours. The February record high is 23°C (2010) and the record low is -4°C (1977).

Isahaya weather in March

In March, Isahaya averages a high of 16°C and a low of 7°C. It gets 113 mm of precipitation over about 10 rainy days. The sun is out about 38% of daylight hours. The March record high is 24°C (2007) and the record low is -3°C (1977).

Isahaya weather in April

In April, Isahaya averages a high of 20°C and a low of 11°C. It gets 145 mm of precipitation over about 9 rainy days. The sun is out about 38% of daylight hours. The April record high is 29°C (1998) and the record low is 1°C (1972). April is one of the most comfortable months to visit.

Isahaya weather in May

In May, Isahaya averages a high of 24°C and a low of 16°C. It gets 162 mm of precipitation over about 10 rainy days. The sun is out about 33% of daylight hours. The May record high is 32°C (1998) and the record low is 4°C (2026). May is one of the most comfortable months to visit.

Isahaya weather in June

In June, Isahaya averages a high of 26°C and a low of 20°C. It gets 326 mm of precipitation over about 14 rainy days. The sun is out about 22% of daylight hours. The June record high is 37°C (2004) and the record low is 13°C (1981).

Isahaya weather in July

In July, Isahaya averages a high of 31°C and a low of 24°C. It gets 288 mm of precipitation over about 12 rainy days. The sun is out about 26% of daylight hours. The July record high is 38°C (1994) and the record low is 15°C (2026).

Isahaya weather in August

In August, Isahaya averages a high of 32°C and a low of 25°C. It gets 204 mm of precipitation over about 10 rainy days. The sun is out about 44% of daylight hours. The August record high is 38°C (2026) and the record low is 19°C (1979).

Isahaya weather in September

In September, Isahaya averages a high of 29°C and a low of 22°C. It gets 186 mm of precipitation over about 9 rainy days. The sun is out about 43% of daylight hours. The September record high is 36°C (2022) and the record low is 12°C (1973).

Isahaya weather in October

In October, Isahaya averages a high of 24°C and a low of 16°C. It gets 102 mm of precipitation over about 6 rainy days. The sun is out about 56% of daylight hours. The October record high is 32°C (2016) and the record low is 5°C (1970). October is one of the most comfortable months to visit.

Isahaya weather in November

In November, Isahaya averages a high of 18°C and a low of 11°C. It gets 96 mm of precipitation over about 8 rainy days. The sun is out about 51% of daylight hours. The November record high is 26°C (1979) and the record low is 1°C (1970). November is one of the most comfortable months to visit.

Isahaya weather in December

In December, Isahaya averages a high of 13°C and a low of 6°C. It gets 73 mm of precipitation over about 9 rainy days. The sun is out about 41% of daylight hours. The December record high is 23°C (2018) and the record low is -2°C (1973).

Sunshine, humidity and wind in Isahaya

October is the sunniest month in Isahaya, with sunshine about 56% of daylight hours. June is the cloudiest, at 22%. Over the year the sun shines about 39% of daylight hours. Isahaya is sunnier than 60% of Japan.

Humidity peaks in July at 88% and is lowest in December at 66%.

Isahaya has about 22 days a year above 32°C. Isahaya is hotter than 58% of Japan.

Isahaya weather records

The hottest temperature on record at the Isahaya station is 38°C, on July 23, 1994. The coldest is -4°C, on January 25, 2016.

The wettest day on record brought 448 mm of rain, on July 23, 1982.

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

The best time to visit Isahaya

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 4°C.

Spring (March–May) is mild, with average highs around 20°C and lows near 11°C.

Summer (June–August) is hot, with average highs around 30°C and lows near 23°C. It can feel humid.

Autumn (September–November) is warm, with average highs around 24°C and lows near 16°C.

Isahaya climate questions

How much rain does Isahaya get?

Isahaya gets 1830 mm of precipitation in an average year, over about 115 rainy days.

What is the wettest month in Isahaya?

June is the wettest month in Isahaya, with 326 mm. January is the driest, with 59 mm.

How many rainy days does Isahaya have a year?

Isahaya has about 115 days with measurable rain in an average year. June has the most, about 14.

What is the hottest month in Isahaya?

August is the warmest month in Isahaya, with an average high of 32°C.

What is the coldest month in Isahaya?

January is the coldest month in Isahaya, with an average low of 3°C.

What is the record high temperature in Isahaya?

The record high at the Isahaya station is 38°C, set on July 23, 1994. The record low is -4°C, on January 25, 2016.

What is the sunniest month in Isahaya?

October is the sunniest month in Isahaya, with sunshine about 56% of daylight hours. June is the cloudiest.

What is the best time to visit Isahaya?

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