Hyperlocal rainfall totals + real-time NOAA forecasts
Accurate weather without the clutter
Izumo, Shimane Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Izumo, Shimane?
Izumo, Shimane gets 1734 mm of precipitation a year over about 155 rainy days. August is the warmest month (average high 32°C) and February the coldest (average low 1°C).
Humid subtropical climate
Izumo, Shimane has hot summers and chilly winters. Daytime highs range from about 8°C in January to 32°C in August. July is usually the wettest month. The most comfortable time to visit is typically April to June and October, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 2° | 9° |
| Spring | Mar–May | 8° | 18° |
| Summer | Jun–Aug | 21° | 29° |
| Autumn | Sep–Nov | 13° | 22° |
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.
From October 2025 to September 2026 Izumo got 4198 mm of rain, against a normal of 1734 mm for those months. July 2026 had the most, with 1657 mm.
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. Estimated sunshine is 32% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 35% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. 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. 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 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. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 34% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 45% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 34% of daylight hours, derived from ERA5 cloud cover. 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 estimated sunshine of 45% of daylight hours from ERA5 cloud cover. July is the cloudiest, at 26%. The annual cloud-cover estimate is 36% of daylight hours; it is not a measurement of sunshine duration. 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
These records cover MATSUE during 1970–2026. Earlier records or other stations in the city may differ.
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 in the available station history brought 392 mm of precipitation, on September 21, 2026.
40 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.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 1° | 8° | 153 mm | 21 | 73% | 32% | 21° | -7° |
| February | 1° | 9° | 117 mm | 16 | 70% | 35% | 24° | -9° |
| March | 3° | 13° | 125 mm | 14 | 69% | 38% | 27° | -4° |
| April | 7° | 18° | 119 mm | 10 | 67% | 42% | 31° | -2° |
| May | 13° | 23° | 132 mm | 9 | 69% | 36% | 32° | 3° |
| June | 18° | 26° | 165 mm | 11 | 76% | 28% | 35° | 9° |
| July | 22° | 30° | 224 mm | 12 | 80% | 26% | 37° | 9° |
| August | 23° | 32° | 125 mm | 9 | 77% | 36% | 38° | 16° |
| September | 19° | 27° | 201 mm | 12 | 78% | 34% | 36° | 8° |
| October | 13° | 22° | 110 mm | 10 | 75% | 43% | 32° | 4° |
| November | 7° | 17° | 116 mm | 13 | 73% | 45% | 26° | -1° |
| December | 3° | 11° | 148 mm | 19 | 72% | 34% | 23° | -4° |
Station: MATSUE, 29 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.
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?
Within the available 1970–2026 station history, 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 estimated sunshine of 45% of daylight hours from ERA5 cloud cover. 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.