Ōshū, Iwate Weather by Month and Climate Averages

How much rain does Ōshū get?

Ōshū 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.

Ōshū weather by month

Ōshū weather in January

In January, Ōshū averages a high of 5°C and a low of -3°C. It gets 49 mm of precipitation over about 8 rainy days. The sun is out about 34% of daylight hours. The January record high is 17°C (1988) and the record low is -11°C (1985).

Ōshū weather in February

In February, Ōshū averages a high of 6°C and a low of -3°C. It gets 38 mm of precipitation over about 7 rainy days. The sun is out about 35% of daylight hours. The February record high is 18°C (2016) and the record low is -12°C (1980).

Ōshū weather in March

In March, Ōshū averages a high of 9°C and a low of -1°C. It gets 83 mm of precipitation over about 8 rainy days. The sun is out about 35% of daylight hours. The March record high is 24°C (2018) and the record low is -8°C (1981).

Ōshū weather in April

In April, Ōshū averages a high of 15°C and a low of 4°C. It gets 108 mm of precipitation over about 8 rainy days. The sun is out about 39% of daylight hours. The April record high is 32°C (1998) and the record low is -4°C (1988).

Ōshū weather in May

In May, Ōshū averages a high of 19°C and a low of 9°C. It gets 138 mm of precipitation over about 9 rainy days. The sun is out about 32% of daylight hours. 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.

Ōshū weather in June

In June, Ōshū averages a high of 22°C and a low of 14°C. It gets 159 mm of precipitation over about 10 rainy days. The sun is out about 25% of daylight hours. 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.

Ōshū weather in July

In July, Ōshū averages a high of 26°C and a low of 18°C. It gets 167 mm of precipitation over about 12 rainy days. The sun is out about 19% of daylight hours. 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.

Ōshū weather in August

In August, Ōshū averages a high of 27°C and a low of 20°C. It gets 161 mm of precipitation over about 10 rainy days. The sun is out about 23% of daylight hours. The August record high is 37°C (2015) and the record low is 11°C (1991).

Ōshū weather in September

In September, Ōshū averages a high of 24°C and a low of 16°C. It gets 186 mm of precipitation over about 11 rainy days. The sun is out about 21% of daylight hours. The September record high is 34°C (1985) and the record low is 7°C (2010).

Ōshū weather in October

In October, Ōshū averages a high of 19°C and a low of 9°C. It gets 146 mm of precipitation over about 8 rainy days. The sun is out about 32% of daylight hours. 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.

Ōshū weather in November

In November, Ōshū averages a high of 13°C and a low of 3°C. It gets 84 mm of precipitation over about 8 rainy days. The sun is out about 38% of daylight hours. The November record high is 24°C (2023) and the record low is -4°C (1974).

Ōshū weather in December

In December, Ōshū averages a high of 7°C and a low of -1°C. It gets 59 mm of precipitation over about 8 rainy days. The sun is out about 33% of daylight hours. The December record high is 19°C (2025) and the record low is -9°C (1976).

Sunshine, humidity and wind in Ōshū

April is the sunniest month in Ōshū, with sunshine about 39% of daylight hours. July is the cloudiest, at 19%. Over the year the sun shines about 31% of daylight hours. Ōshū is cloudier than 96% of Japan.

Humidity peaks in July at 83% and is lowest in April at 65%.

Ōshū has about 5 days a year above 32°C. Ōshū is cooler than 82% of Japan.

First and last freeze in Ōshū

The first fall freeze in Ōshū typically comes around November 18, and the last spring freeze around April 9. That leaves a frost-free growing season of about 223 days.

Ōshū weather records

The hottest temperature on record at the Ōshū station is 37°C, on August 15, 2007. The coldest is -12°C, on February 17, 1980.

The wettest day on record brought 200 mm of rain, on May 16, 1977.

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

The best time to visit Ōshū

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.

Ōshū climate questions

How much rain does Ōshū get?

Ōshū gets 1378 mm of precipitation in an average year, over about 106 rainy days.

What is the wettest month in Ōshū?

September is the wettest month in Ōshū, with 186 mm. February is the driest, with 38 mm.

How many rainy days does Ōshū have a year?

Ōshū has about 106 days with measurable rain in an average year. July has the most, about 12.

What is the hottest month in Ōshū?

August is the warmest month in Ōshū, with an average high of 27°C.

What is the coldest month in Ōshū?

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

What is the record high temperature in Ōshū?

The record high at the Ōshū 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 Ōshū?

April is the sunniest month in Ōshū, with sunshine about 39% of daylight hours. July is the cloudiest.

When is the first frost in Ōshū?

The first fall freeze in Ōshū typically comes around November 18. The last spring freeze is around April 9.

What is the best time to visit Ōshū?

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