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Ichinoseki, Iwate Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Ichinoseki, Iwate?
Ichinoseki, Iwate gets 1378 mm of precipitation a year over about 106 rainy days. August is the warmest month (average high 27°C) and January the coldest (average low -3°C).
Humid subtropical climate
Ichinoseki, Iwate has warm summers and chilly winters. Daytime highs range from about 5°C in January to 27°C in August. September is usually the wettest month. The most comfortable time to visit is typically May to July and October, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -2° | 6° |
| Spring | Mar–May | 4° | 14° |
| Summer | Jun–Aug | 17° | 26° |
| Autumn | Sep–Nov | 9° | 19° |
How much rain does Ichinoseki get?
Ichinoseki gets 1378 mm of precipitation in an average year, spread over about 106 days with measurable rain. That is fewer rainy days than 61% of Japan.
September is the wettest month, with 186 mm. February is the driest, with 38 mm. July has the most rainy days, about 12.
The longest dry spell in the last five years lasted 22 days, to February 15, 2024.
From October 2025 to September 2026 Ichinoseki got 671 mm of rain, against a normal of 1378 mm for those months. September 2026 had the most, with 291 mm.
Ichinoseki weather by month
Ichinoseki weather in January
In January, Ichinoseki averages a high of 5°C and a low of -3°C. It gets 49 mm of precipitation over about 8 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The January record high is 17°C (1988) and the record low is -11°C (1985).
Ichinoseki weather in February
In February, Ichinoseki averages a high of 6°C and a low of -3°C. It gets 38 mm of precipitation over about 7 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The February record high is 18°C (2016) and the record low is -12°C (1980).
Ichinoseki weather in March
In March, Ichinoseki averages a high of 9°C and a low of -1°C. It gets 83 mm of precipitation over about 8 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The March record high is 24°C (2018) and the record low is -8°C (1981).
Ichinoseki weather in April
In April, Ichinoseki averages a high of 15°C and a low of 4°C. It gets 108 mm of precipitation over about 8 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The April record high is 32°C (1998) and the record low is -4°C (1988).
Ichinoseki weather in May
In May, Ichinoseki averages a high of 19°C and a low of 9°C. It gets 138 mm of precipitation over about 9 rainy days. Estimated sunshine is 35% of daylight hours, derived from ERA5 cloud cover. The May record high is 34°C (2019) and the record low is 0°C (1971). May is one of the most comfortable months to visit.
Ichinoseki weather in June
In June, Ichinoseki averages a high of 22°C and a low of 14°C. It gets 159 mm of precipitation over about 10 rainy days. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. The June record high is 34°C (2022) and the record low is 4°C (1985). June is one of the most comfortable months to visit.
Ichinoseki weather in July
In July, Ichinoseki averages a high of 26°C and a low of 18°C. It gets 167 mm of precipitation over about 12 rainy days. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. The July record high is 37°C (2023) and the record low is 5°C (1976). July is one of the most comfortable months to visit.
Ichinoseki weather in August
In August, Ichinoseki averages a high of 27°C and a low of 20°C. It gets 161 mm of precipitation over about 10 rainy days. Estimated sunshine is 25% of daylight hours, derived from ERA5 cloud cover. The August record high is 37°C (2015) and the record low is 11°C (1991).
Ichinoseki weather in September
In September, Ichinoseki averages a high of 24°C and a low of 16°C. It gets 186 mm of precipitation over about 11 rainy days. Estimated sunshine is 23% of daylight hours, derived from ERA5 cloud cover. The September record high is 34°C (1985) and the record low is 7°C (2010).
Ichinoseki weather in October
In October, Ichinoseki averages a high of 19°C and a low of 9°C. It gets 146 mm of precipitation over about 8 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The October record high is 28°C (2019) and the record low is -1°C (1983). October is one of the most comfortable months to visit.
Ichinoseki weather in November
In November, Ichinoseki averages a high of 13°C and a low of 3°C. It gets 84 mm of precipitation over about 8 rainy days. Estimated sunshine is 45% of daylight hours, derived from ERA5 cloud cover. The November record high is 24°C (2023) and the record low is -4°C (1974).
Ichinoseki weather in December
In December, Ichinoseki averages a high of 7°C and a low of -1°C. It gets 59 mm of precipitation over about 8 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The December record high is 19°C (2025) and the record low is -9°C (1976).
Sunshine, humidity and wind in Ichinoseki
November is the sunniest month in Ichinoseki, with estimated sunshine of 45% of daylight hours from ERA5 cloud cover. July is the cloudiest, at 21%. The annual cloud-cover estimate is 35% of daylight hours; it is not a measurement of sunshine duration. Ichinoseki is cloudier than 80% of Japan.
Humidity peaks in August at 82% and is lowest in April at 62%.
Ichinoseki has about 5 days a year above 32°C. Ichinoseki is cooler than 82% of Japan.
First and last freeze in Ichinoseki
The first fall freeze in Ichinoseki typically comes around November 18, and the last spring freeze around April 9. That leaves a frost-free growing season of about 223 days.
Ichinoseki weather records
These records cover OFUNATO during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Ichinoseki station is 37°C, on August 15, 2007. The coldest is -12°C, on February 17, 1980.
The wettest day in the available station history brought 200 mm of precipitation, on May 16, 1977.
39 all-time records have been set at the station since 1970.
The best time to visit Ichinoseki
The most comfortable time to visit is typically May to July and October, when daytime highs sit near 22°C.
Winter (December–February) is chilly, with average highs around 6°C and lows near -2°C.
Spring (March–May) is mild, with average highs around 14°C and lows near 4°C.
Summer (June–August) is warm, with average highs around 25°C and lows near 17°C. It can feel humid.
Autumn (September–November) is mild, with average highs around 19°C and lows near 10°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -3° | 5° | 49 mm | 8 | 69% | 41% | 17° | -11° |
| February | -3° | 6° | 38 mm | 7 | 65% | 42% | 18° | -12° |
| March | -1° | 9° | 83 mm | 8 | 64% | 39% | 24° | -8° |
| April | 4° | 15° | 108 mm | 8 | 62% | 42% | 32° | -4° |
| May | 9° | 19° | 138 mm | 9 | 69% | 35% | 34° | 0° |
| June | 14° | 22° | 159 mm | 10 | 77% | 27% | 34° | 4° |
| July | 18° | 26° | 167 mm | 12 | 81% | 21% | 37° | 5° |
| August | 20° | 27° | 161 mm | 10 | 82% | 25% | 37° | 11° |
| September | 16° | 24° | 186 mm | 11 | 81% | 23% | 34° | 7° |
| October | 9° | 19° | 146 mm | 8 | 77% | 36% | 28° | -1° |
| November | 3° | 13° | 84 mm | 8 | 75% | 45% | 24° | -4° |
| December | -1° | 7° | 59 mm | 8 | 73% | 41% | 19° | -9° |
Station: OFUNATO, 53 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.
Ichinoseki climate questions
How much rain does Ichinoseki get?
Ichinoseki gets 1378 mm of precipitation in an average year, over about 106 rainy days.
What is the wettest month in Ichinoseki?
September is the wettest month in Ichinoseki, with 186 mm. February is the driest, with 38 mm.
How many rainy days does Ichinoseki have a year?
Ichinoseki has about 106 days with measurable rain in an average year. July has the most, about 12.
What is the hottest month in Ichinoseki?
August is the warmest month in Ichinoseki, with an average high of 27°C.
What is the coldest month in Ichinoseki?
January is the coldest month in Ichinoseki, with an average low of -3°C.
What is the record high temperature in Ichinoseki?
Within the available 1970–2026 station history, the record high at the Ichinoseki station is 37°C, set on August 15, 2007. The record low is -12°C, on February 17, 1980.
What is the sunniest month in Ichinoseki?
November is the sunniest month in Ichinoseki, with estimated sunshine of 45% of daylight hours from ERA5 cloud cover. July is the cloudiest.
When is the first frost in Ichinoseki?
The first fall freeze in Ichinoseki typically comes around November 18. The last spring freeze is around April 9.
What is the best time to visit Ichinoseki?
The most comfortable time to visit is typically May to July and October, when daytime highs sit near 22°C.