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Onomichi, Hiroshima Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Onomichi, Hiroshima?
Onomichi, Hiroshima gets 994 mm of precipitation a year over about 75 rainy days. August is the warmest month (average high 33°C) and January the coldest (average low -1°C).
Humid subtropical climate
Onomichi, Hiroshima has hot summers and chilly winters. Daytime highs range from about 10°C in January to 33°C in August. July is usually the wettest month. The most comfortable time to visit is typically April to May and October to November, when daytime highs sit near 21°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 0° | 11° |
| Spring | Mar–May | 8° | 19° |
| Summer | Jun–Aug | 22° | 31° |
| Autumn | Sep–Nov | 13° | 23° |
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 24 days, to January 10, 2022.
From October 2025 to September 2026 Onomichi got 2991 mm of rain, against a normal of 994 mm for those months. September 2026 had the most, with 1235 mm.
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. Estimated sunshine is 49% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 47% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 28% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 57% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 56% of daylight hours, derived from ERA5 cloud cover. 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 estimated sunshine of 57% of daylight hours from ERA5 cloud cover. June is the cloudiest, at 26%. The annual cloud-cover estimate is 43% of daylight hours; it is not a measurement of sunshine duration. Onomichi is sunnier than 88% of Japan.
Humidity peaks in July at 76% and is lowest in April at 60%.
Onomichi has about 35 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
These records cover FUKUYAMA during 1970–2026. Earlier records or other stations in the city may differ.
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 in the available station history brought 320 mm of precipitation, on July 1, 2026.
45 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.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -1° | 10° | 31 mm | 4 | 64% | 49% | 17° | -8° |
| February | -1° | 11° | 42 mm | 6 | 63% | 47% | 22° | -9° |
| March | 2° | 14° | 66 mm | 7 | 64% | 42% | 24° | -6° |
| April | 7° | 19° | 75 mm | 7 | 60% | 42% | 28° | -2° |
| May | 13° | 24° | 102 mm | 7 | 64% | 36% | 32° | 3° |
| June | 18° | 27° | 151 mm | 8 | 72% | 26% | 34° | 9° |
| July | 23° | 31° | 165 mm | 8 | 76% | 28% | 40° | 15° |
| August | 24° | 33° | 69 mm | 5 | 70% | 40% | 38° | 16° |
| September | 19° | 29° | 121 mm | 7 | 70% | 38% | 37° | 8° |
| October | 13° | 23° | 87 mm | 6 | 65% | 50% | 32° | 2° |
| November | 7° | 18° | 50 mm | 5 | 66% | 57% | 27° | -2° |
| December | 2° | 12° | 37 mm | 5 | 62% | 56% | 21° | -6° |
Station: FUKUYAMA, 6 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.
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?
Within the available 1970–2026 station history, 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 estimated sunshine of 57% of daylight hours from ERA5 cloud cover. 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.