Onomichi, Hiroshima Weather by Month and Climate Averages

How much rain does Onomichi get?

Onomichi gets 994 mm of precipitation in an average year, spread over about 75 days with measurable rain. That is fewer rainy days than 99% of Japan.

July is the wettest month, with 165 mm. January is the driest, with 31 mm. June has the most rainy days, about 8.

The longest dry spell in the last five years lasted 27 days, to October 15, 2021.

Onomichi weather by month

Onomichi weather in January

In January, Onomichi averages a high of 10°C and a low of -1°C. It gets 31 mm of precipitation over about 4 rainy days. The sun is out about 49% of daylight hours. The January record high is 17°C (2016) and the record low is -8°C (2016).

Onomichi weather in February

In February, Onomichi averages a high of 11°C and a low of -1°C. It gets 42 mm of precipitation over about 6 rainy days. The sun is out about 47% of daylight hours. The February record high is 22°C (2004) and the record low is -9°C (1981).

Onomichi weather in March

In March, Onomichi averages a high of 14°C and a low of 2°C. It gets 66 mm of precipitation over about 7 rainy days. The sun is out about 42% of daylight hours. The March record high is 24°C (2025) and the record low is -6°C (1977).

Onomichi weather in April

In April, Onomichi averages a high of 19°C and a low of 7°C. It gets 75 mm of precipitation over about 7 rainy days. The sun is out about 42% of daylight hours. The April record high is 28°C (1989) and the record low is -2°C (1987). April is one of the most comfortable months to visit.

Onomichi weather in May

In May, Onomichi averages a high of 24°C and a low of 13°C. It gets 102 mm of precipitation over about 7 rainy days. The sun is out about 36% of daylight hours. The May record high is 32°C (1998) and the record low is 3°C (1980). May is one of the most comfortable months to visit.

Onomichi weather in June

In June, Onomichi averages a high of 27°C and a low of 18°C. It gets 151 mm of precipitation over about 8 rainy days. The sun is out about 26% of daylight hours. The June record high is 34°C (2004) and the record low is 9°C (1978).

Onomichi weather in July

In July, Onomichi averages a high of 31°C and a low of 23°C. It gets 165 mm of precipitation over about 8 rainy days. The sun is out about 28% of daylight hours. The July record high is 40°C (2000) and the record low is 15°C (1982).

Onomichi weather in August

In August, Onomichi averages a high of 33°C and a low of 24°C. It gets 69 mm of precipitation over about 5 rainy days. The sun is out about 40% of daylight hours. The August record high is 38°C (2021) and the record low is 16°C (1972).

Onomichi weather in September

In September, Onomichi averages a high of 29°C and a low of 19°C. It gets 121 mm of precipitation over about 7 rainy days. The sun is out about 38% of daylight hours. The September record high is 37°C (2010) and the record low is 8°C (1987).

Onomichi weather in October

In October, Onomichi averages a high of 23°C and a low of 13°C. It gets 87 mm of precipitation over about 6 rainy days. The sun is out about 50% of daylight hours. The October record high is 32°C (2018) and the record low is 2°C (1986). October is one of the most comfortable months to visit.

Onomichi weather in November

In November, Onomichi averages a high of 18°C and a low of 7°C. It gets 50 mm of precipitation over about 5 rainy days. The sun is out about 57% of daylight hours. The November record high is 27°C (2023) and the record low is -2°C (2008). November is one of the most comfortable months to visit.

Onomichi weather in December

In December, Onomichi averages a high of 12°C and a low of 2°C. It gets 37 mm of precipitation over about 5 rainy days. The sun is out about 56% of daylight hours. The December record high is 21°C (2018) and the record low is -6°C (1985).

Sunshine, humidity and wind in Onomichi

November is the sunniest month in Onomichi, with sunshine about 57% of daylight hours. June is the cloudiest, at 26%. Over the year the sun shines about 43% of daylight hours. Onomichi is sunnier than 88% of Japan.

Humidity peaks in July at 76% and is lowest in April at 60%.

Onomichi has about 34 days a year above 32°C. Onomichi is hotter than 89% of Japan.

First and last freeze in Onomichi

The first fall freeze in Onomichi typically comes around December 6, and the last spring freeze around March 25. That leaves a frost-free growing season of about 256 days.

Onomichi weather records

The hottest temperature on record at the Onomichi station is 40°C, on July 6, 2000. The coldest is -9°C, on February 27, 1981.

The wettest day on record brought 151 mm of rain, on August 17, 1975.

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

The best time to visit Onomichi

The most comfortable time to visit is typically April to May and October to November, when daytime highs sit near 21°C.

Winter (December–February) is chilly, with average highs around 11°C and lows near 0°C.

Spring (March–May) is mild, with average highs around 19°C and lows near 8°C.

Summer (June–August) is hot, with average highs around 30°C and lows near 22°C. It can feel humid.

Autumn (September–November) is warm, with average highs around 23°C and lows near 13°C.

Onomichi climate questions

How much rain does Onomichi get?

Onomichi gets 994 mm of precipitation in an average year, over about 75 rainy days.

What is the wettest month in Onomichi?

July is the wettest month in Onomichi, with 165 mm. January is the driest, with 31 mm.

How many rainy days does Onomichi have a year?

Onomichi has about 75 days with measurable rain in an average year. June has the most, about 8.

What is the hottest month in Onomichi?

August is the warmest month in Onomichi, with an average high of 33°C.

What is the coldest month in Onomichi?

January is the coldest month in Onomichi, with an average low of -1°C.

What is the record high temperature in Onomichi?

The record high at the Onomichi station is 40°C, set on July 6, 2000. The record low is -9°C, on February 27, 1981.

What is the sunniest month in Onomichi?

November is the sunniest month in Onomichi, with sunshine about 57% of daylight hours. June is the cloudiest.

When is the first frost in Onomichi?

The first fall freeze in Onomichi typically comes around December 6. The last spring freeze is around March 25.

What is the best time to visit Onomichi?

The most comfortable time to visit is typically April to May and October to November, when daytime highs sit near 21°C.