Izumo, Shimane Weather by Month and Climate Averages

How much rain does Izumo get?

Izumo gets 1734 mm of precipitation in an average year, spread over about 155 days with measurable rain. That is more rainy days than 82% of Japan.

July is the wettest month, with 224 mm. October is the driest, with 110 mm. January has the most rainy days, about 21.

The longest dry spell in the last five years lasted 14 days, to August 3, 2025.

Izumo weather by month

Izumo weather in January

In January, Izumo averages a high of 8°C and a low of 1°C. It gets 153 mm of precipitation over about 21 rainy days. The sun is out about 32% of daylight hours. The January record high is 21°C (2002) and the record low is -7°C (1970).

Izumo weather in February

In February, Izumo averages a high of 9°C and a low of 1°C. It gets 117 mm of precipitation over about 16 rainy days. The sun is out about 35% of daylight hours. The February record high is 24°C (2004) and the record low is -9°C (1977).

Izumo weather in March

In March, Izumo averages a high of 13°C and a low of 3°C. It gets 125 mm of precipitation over about 14 rainy days. The sun is out about 38% of daylight hours. The March record high is 27°C (2025) and the record low is -4°C (1986).

Izumo weather in April

In April, Izumo averages a high of 18°C and a low of 7°C. It gets 119 mm of precipitation over about 10 rainy days. The sun is out about 42% of daylight hours. The April record high is 31°C (1978) and the record low is -2°C (1987). April is one of the most comfortable months to visit.

Izumo weather in May

In May, Izumo averages a high of 23°C and a low of 13°C. It gets 132 mm of precipitation over about 9 rainy days. The sun is out about 36% of daylight hours. The May record high is 32°C (2019) and the record low is 3°C (1980). May is one of the most comfortable months to visit.

Izumo weather in June

In June, Izumo averages a high of 26°C and a low of 18°C. It gets 165 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 9°C (1981). June is one of the most comfortable months to visit.

Izumo weather in July

In July, Izumo averages a high of 30°C and a low of 22°C. It gets 224 mm of precipitation over about 12 rainy days. The sun is out about 26% of daylight hours. The July record high is 37°C (2018) and the record low is 9°C (2026).

Izumo weather in August

In August, Izumo averages a high of 32°C and a low of 23°C. It gets 125 mm of precipitation over about 9 rainy days. The sun is out about 36% of daylight hours. The August record high is 38°C (1994) and the record low is 16°C (1972).

Izumo weather in September

In September, Izumo averages a high of 27°C and a low of 19°C. It gets 201 mm of precipitation over about 12 rainy days. The sun is out about 34% of daylight hours. The September record high is 36°C (2010) and the record low is 8°C (1987).

Izumo weather in October

In October, Izumo averages a high of 22°C and a low of 13°C. It gets 110 mm of precipitation over about 10 rainy days. The sun is out about 43% of daylight hours. The October record high is 32°C (2019) and the record low is 4°C (1983). October is one of the most comfortable months to visit.

Izumo weather in November

In November, Izumo averages a high of 17°C and a low of 7°C. It gets 116 mm of precipitation over about 13 rainy days. The sun is out about 45% of daylight hours. The November record high is 26°C (1989) and the record low is -1°C (1983).

Izumo weather in December

In December, Izumo averages a high of 11°C and a low of 3°C. It gets 148 mm of precipitation over about 19 rainy days. The sun is out about 34% of daylight hours. The December record high is 23°C (2018) and the record low is -4°C (1976).

Sunshine, humidity and wind in Izumo

November is the sunniest month in Izumo, with sunshine about 45% of daylight hours. July is the cloudiest, at 26%. Over the year the sun shines about 36% of daylight hours. Izumo is cloudier than 72% of Japan.

Humidity peaks in July at 80% and is lowest in April at 67%.

Izumo has about 25 days a year above 32°C. Izumo is hotter than 66% of Japan.

First and last freeze in Izumo

The first fall freeze in Izumo typically comes around December 19, and the last spring freeze around March 23. That leaves a frost-free growing season of about 271 days.

Izumo weather records

The hottest temperature on record at the Izumo station is 38°C, on August 1, 1994. The coldest is -9°C, on February 19, 1977.

The wettest day on record brought 220 mm of rain, on July 13, 1988.

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

The best time to visit Izumo

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

Winter (December–February) is chilly, with average highs around 10°C and lows near 1°C.

Spring (March–May) is mild, with average highs around 18°C and lows near 8°C.

Summer (June–August) is hot, with average highs around 29°C and lows near 21°C. It can feel humid.

Autumn (September–November) is warm, with average highs around 22°C and lows near 13°C.

Izumo climate questions

How much rain does Izumo get?

Izumo gets 1734 mm of precipitation in an average year, over about 155 rainy days.

What is the wettest month in Izumo?

July is the wettest month in Izumo, with 224 mm. October is the driest, with 110 mm.

How many rainy days does Izumo have a year?

Izumo has about 155 days with measurable rain in an average year. January has the most, about 21.

What is the hottest month in Izumo?

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

What is the coldest month in Izumo?

February is the coldest month in Izumo, with an average low of 1°C.

What is the record high temperature in Izumo?

The record high at the Izumo station is 38°C, set on August 1, 1994. The record low is -9°C, on February 19, 1977.

What is the sunniest month in Izumo?

November is the sunniest month in Izumo, with sunshine about 45% of daylight hours. July is the cloudiest.

When is the first frost in Izumo?

The first fall freeze in Izumo typically comes around December 19. The last spring freeze is around March 23.

What is the best time to visit Izumo?

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