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Ōsaki, Miyagi Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Ōsaki, Miyagi?
Ōsaki, Miyagi gets 919 mm of precipitation a year over about 81 rainy days. August is the warmest month (average high 27°C) and January the coldest (average low -3°C).
Humid subtropical climate
Ōsaki, Miyagi 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 21°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -2° | 6° |
| Spring | Mar–May | 5° | 14° |
| Summer | Jun–Aug | 18° | 25° |
| Autumn | Sep–Nov | 11° | 19° |
How much rain does Ōsaki get?
Ōsaki gets 919 mm of precipitation in an average year, spread over about 81 days with measurable rain. That is fewer rainy days than 99% of Japan.
September is the wettest month, with 135 mm. February is the driest, with 25 mm. July has the most rainy days, about 10.
The longest dry spell in the last five years lasted 25 days, to August 2, 2026.
From October 2025 to September 2026 Ōsaki got 1399 mm of rain, against a normal of 919 mm for those months. September 2026 had the most, with 756 mm.
Ōsaki weather by month
Ōsaki weather in January
In January, Ōsaki averages a high of 5°C and a low of -3°C. It gets 31 mm of precipitation over about 5 rainy days. Estimated sunshine is 44% of daylight hours, derived from ERA5 cloud cover. The January record high is 15°C (1973) and the record low is -11°C (2021).
Ōsaki weather in February
In February, Ōsaki averages a high of 6°C and a low of -3°C. It gets 25 mm of precipitation over about 5 rainy days. Estimated sunshine is 45% of daylight hours, derived from ERA5 cloud cover. The February record high is 19°C (1993) and the record low is -11°C (1977).
Ōsaki weather in March
In March, Ōsaki averages a high of 9°C and a low of 0°C. It gets 55 mm of precipitation over about 6 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The March record high is 21°C (2021) and the record low is -8°C (1970).
Ōsaki weather in April
In April, Ōsaki averages a high of 14°C and a low of 5°C. It gets 69 mm of precipitation over about 7 rainy days. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. The April record high is 28°C (2018) and the record low is -3°C (1981).
Ōsaki weather in May
In May, Ōsaki averages a high of 19°C and a low of 11°C. It gets 83 mm of precipitation over about 7 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The May record high is 31°C (2016) and the record low is 1°C (1992). May is one of the most comfortable months to visit.
Ōsaki weather in June
In June, Ōsaki averages a high of 22°C and a low of 16°C. It gets 92 mm of precipitation over about 8 rainy days. Estimated sunshine is 28% of daylight hours, derived from ERA5 cloud cover. The June record high is 34°C (2022) and the record low is 7°C (2010). June is one of the most comfortable months to visit.
Ōsaki weather in July
In July, Ōsaki averages a high of 26°C and a low of 19°C. It gets 115 mm of precipitation over about 10 rainy days. Estimated sunshine is 22% of daylight hours, derived from ERA5 cloud cover. The July record high is 36°C (2011) and the record low is 8°C (1976). July is one of the most comfortable months to visit.
Ōsaki weather in August
In August, Ōsaki averages a high of 27°C and a low of 21°C. It gets 105 mm of precipitation over about 8 rainy days. Estimated sunshine is 30% of daylight hours, derived from ERA5 cloud cover. The August record high is 37°C (2007) and the record low is 13°C (1980).
Ōsaki weather in September
In September, Ōsaki averages a high of 24°C and a low of 17°C. It gets 135 mm of precipitation over about 9 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The September record high is 34°C (2000) and the record low is 7°C (1981).
Ōsaki weather in October
In October, Ōsaki averages a high of 19°C and a low of 10°C. It gets 120 mm of precipitation over about 7 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The October record high is 28°C (2018) and the record low is 1°C (1983). October is one of the most comfortable months to visit.
Ōsaki weather in November
In November, Ōsaki averages a high of 13°C and a low of 4°C. It gets 53 mm of precipitation over about 5 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The November record high is 24°C (1979) and the record low is -4°C (1970).
Ōsaki weather in December
In December, Ōsaki averages a high of 7°C and a low of -1°C. It gets 37 mm of precipitation over about 6 rainy days. Estimated sunshine is 44% of daylight hours, derived from ERA5 cloud cover. The December record high is 22°C (1990) and the record low is -8°C (1976).
Sunshine, humidity and wind in Ōsaki
November is the sunniest month in Ōsaki, with estimated sunshine of 50% of daylight hours from ERA5 cloud cover. July is the cloudiest, at 22%. The annual cloud-cover estimate is 37% of daylight hours; it is not a measurement of sunshine duration. Ōsaki is cloudier than 58% of Japan.
Humidity peaks in July at 84% and is lowest in March at 66%.
Ōsaki has about 4 days a year above 32°C. Ōsaki is cooler than 84% of Japan.
First and last freeze in Ōsaki
The first fall freeze in Ōsaki typically comes around November 22, and the last spring freeze around April 4. That leaves a frost-free growing season of about 232 days.
Ōsaki weather records
These records cover ISHINOMAKI during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Ōsaki station is 37°C, on August 15, 2007. The coldest is -11°C, on February 17, 1978.
The wettest day in the available station history brought 224 mm of precipitation, on July 4, 2026.
42 all-time records have been set at the station since 1970.
The best time to visit Ōsaki
The most comfortable time to visit is typically May to July and October, when daytime highs sit near 21°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 5°C.
Summer (June–August) is warm, with average highs around 25°C and lows near 18°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° | 31 mm | 5 | 70% | 44% | 15° | -11° |
| February | -3° | 6° | 25 mm | 5 | 67% | 45% | 19° | -11° |
| March | 0° | 9° | 55 mm | 6 | 66% | 41% | 21° | -8° |
| April | 5° | 14° | 69 mm | 7 | 66% | 43% | 28° | -3° |
| May | 11° | 19° | 83 mm | 7 | 71% | 36% | 31° | 1° |
| June | 16° | 22° | 92 mm | 8 | 79% | 28% | 34° | 7° |
| July | 19° | 26° | 115 mm | 10 | 84% | 22% | 36° | 8° |
| August | 21° | 27° | 105 mm | 8 | 83% | 30% | 37° | 13° |
| September | 17° | 24° | 135 mm | 9 | 82% | 24% | 34° | 7° |
| October | 10° | 19° | 120 mm | 7 | 77% | 39% | 28° | 1° |
| November | 4° | 13° | 53 mm | 5 | 74% | 50% | 24° | -4° |
| December | -1° | 7° | 37 mm | 6 | 74% | 44% | 22° | -8° |
Station: ISHINOMAKI, 33 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.
Ōsaki climate questions
How much rain does Ōsaki get?
Ōsaki gets 919 mm of precipitation in an average year, over about 81 rainy days.
What is the wettest month in Ōsaki?
September is the wettest month in Ōsaki, with 135 mm. February is the driest, with 25 mm.
How many rainy days does Ōsaki have a year?
Ōsaki has about 81 days with measurable rain in an average year. July has the most, about 10.
What is the hottest month in Ōsaki?
August is the warmest month in Ōsaki, with an average high of 27°C.
What is the coldest month in Ōsaki?
January is the coldest month in Ōsaki, with an average low of -3°C.
What is the record high temperature in Ōsaki?
Within the available 1970–2026 station history, the record high at the Ōsaki station is 37°C, set on August 15, 2007. The record low is -11°C, on February 17, 1978.
What is the sunniest month in Ōsaki?
November is the sunniest month in Ōsaki, with estimated sunshine of 50% of daylight hours from ERA5 cloud cover. July is the cloudiest.
When is the first frost in Ōsaki?
The first fall freeze in Ōsaki typically comes around November 22. The last spring freeze is around April 4.
What is the best time to visit Ōsaki?
The most comfortable time to visit is typically May to July and October, when daytime highs sit near 21°C.