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Kofu, Yamanashi Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Kofu, Yamanashi?
Kofu, Yamanashi gets 1022 mm of precipitation a year over about 86 rainy days. August is the warmest month (average high 33°C) and January the coldest (average low -3°C).
Humid subtropical climate
Kofu, Yamanashi has hot summers and chilly winters. Daytime highs range from about 9°C in January to 33°C in August. September 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 | -2° | 11° |
| Spring | Mar–May | 8° | 21° |
| Summer | Jun–Aug | 21° | 31° |
| Autumn | Sep–Nov | 12° | 23° |
How much rain does Kofu get?
Kofu gets 1022 mm of precipitation in an average year, spread over about 86 days with measurable rain. That is fewer rainy days than 95% of Japan.
September is the wettest month, with 168 mm. December is the driest, with 33 mm. July has the most rainy days, about 11.
The longest dry spell in the last five years lasted 24 days, to December 11, 2023.
From October 2025 to September 2026 Kofu got 4815 mm of rain, against a normal of 1022 mm for those months. September 2026 had the most, with 2989 mm.
Kofu weather by month
Kofu weather in January
In January, Kofu averages a high of 9°C and a low of -3°C. It gets 35 mm of precipitation over about 4 rainy days. Estimated sunshine is 56% of daylight hours, derived from ERA5 cloud cover. The January record high is 19°C (1996) and the record low is -11°C (1986).
Kofu weather in February
In February, Kofu averages a high of 11°C and a low of -2°C. It gets 39 mm of precipitation over about 5 rainy days. Estimated sunshine is 52% of daylight hours, derived from ERA5 cloud cover. The February record high is 25°C (2009) and the record low is -11°C (1984).
Kofu weather in March
In March, Kofu averages a high of 15°C and a low of 2°C. It gets 76 mm of precipitation over about 8 rainy days. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. The March record high is 27°C (1996) and the record low is -8°C (1977).
Kofu weather in April
In April, Kofu averages a high of 21°C and a low of 8°C. It gets 72 mm of precipitation over about 7 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The April record high is 33°C (2004) and the record low is -3°C (2001). April is one of the most comfortable months to visit.
Kofu weather in May
In May, Kofu averages a high of 26°C and a low of 13°C. It gets 74 mm of precipitation over about 7 rainy days. Estimated sunshine is 29% of daylight hours, derived from ERA5 cloud cover. The May record high is 35°C (2019) and the record low is 2°C (1972). May is one of the most comfortable months to visit.
Kofu weather in June
In June, Kofu averages a high of 28°C and a low of 18°C. It gets 102 mm of precipitation over about 10 rainy days. Estimated sunshine is 19% of daylight hours, derived from ERA5 cloud cover. The June record high is 38°C (2011) and the record low is 9°C (1981).
Kofu weather in July
In July, Kofu averages a high of 32°C and a low of 22°C. It gets 121 mm of precipitation over about 11 rainy days. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. The July record high is 41°C (2004) and the record low is 13°C (1976).
Kofu weather in August
In August, Kofu averages a high of 33°C and a low of 23°C. It gets 109 mm of precipitation over about 9 rainy days. Estimated sunshine is 28% of daylight hours, derived from ERA5 cloud cover. The August record high is 41°C (2013) and the record low is 15°C (1981).
Kofu weather in September
In September, Kofu averages a high of 28°C and a low of 19°C. It gets 168 mm of precipitation over about 10 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The September record high is 38°C (1992) and the record low is 8°C (1992).
Kofu weather in October
In October, Kofu averages a high of 22°C and a low of 12°C. It gets 148 mm of precipitation over about 8 rainy days. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. The October record high is 33°C (1979) and the record low is 2°C (1982). October is one of the most comfortable months to visit.
Kofu weather in November
In November, Kofu averages a high of 17°C and a low of 5°C. It gets 44 mm of precipitation over about 5 rainy days. Estimated sunshine is 52% of daylight hours, derived from ERA5 cloud cover. The November record high is 28°C (2023) and the record low is -4°C (1973). November is one of the most comfortable months to visit.
Kofu weather in December
In December, Kofu averages a high of 12°C and a low of -1°C. It gets 33 mm of precipitation over about 4 rainy days. Estimated sunshine is 61% of daylight hours, derived from ERA5 cloud cover. The December record high is 25°C (2004) and the record low is -9°C (1976).
Sunshine, humidity and wind in Kofu
December is the sunniest month in Kofu, with estimated sunshine of 61% of daylight hours from ERA5 cloud cover. June is the cloudiest, at 19%. The annual cloud-cover estimate is 38% of daylight hours; it is not a measurement of sunshine duration. Kofu is sunnier than 53% of Japan.
Humidity peaks in July at 78% and is lowest in February at 54%.
Kofu has about 39 days a year above 32°C. Kofu is hotter than 96% of Japan.
First and last freeze in Kofu
The first fall freeze in Kofu typically comes around November 27, and the last spring freeze around March 26. That leaves a frost-free growing season of about 246 days.
Kofu weather records
These records cover KOFU during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Kofu station is 41°C, on August 10, 2013. The coldest is -11°C, on January 6, 1986.
The wettest day in the available station history brought 456 mm of precipitation, on August 13, 2026.
51 all-time records have been set at the station since 1970.
The best time to visit Kofu
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 -2°C.
Spring (March–May) is warm, with average highs around 20°C and lows near 8°C.
Summer (June–August) is hot, with average highs around 31°C and lows near 21°C. It can feel humid.
Autumn (September–November) is warm, with average highs around 23°C and lows near 12°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -3° | 9° | 35 mm | 4 | 57% | 56% | 19° | -11° |
| February | -2° | 11° | 39 mm | 5 | 54% | 52% | 25° | -11° |
| March | 2° | 15° | 76 mm | 8 | 58% | 43% | 27° | -8° |
| April | 8° | 21° | 72 mm | 7 | 59% | 38% | 33° | -3° |
| May | 13° | 26° | 74 mm | 7 | 64% | 29% | 35° | 2° |
| June | 18° | 28° | 102 mm | 10 | 72% | 19% | 38° | 9° |
| July | 22° | 32° | 121 mm | 11 | 78% | 21% | 41° | 13° |
| August | 23° | 33° | 109 mm | 9 | 77% | 28% | 41° | 15° |
| September | 19° | 28° | 168 mm | 10 | 78% | 24% | 38° | 8° |
| October | 12° | 22° | 148 mm | 8 | 73% | 37% | 33° | 2° |
| November | 5° | 17° | 44 mm | 5 | 69% | 52% | 28° | -4° |
| December | -1° | 12° | 33 mm | 4 | 61% | 61% | 25° | -9° |
Station: KOFU, 2 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.
Kofu climate questions
How much rain does Kofu get?
Kofu gets 1022 mm of precipitation in an average year, over about 86 rainy days.
What is the wettest month in Kofu?
September is the wettest month in Kofu, with 168 mm. December is the driest, with 33 mm.
How many rainy days does Kofu have a year?
Kofu has about 86 days with measurable rain in an average year. July has the most, about 11.
What is the hottest month in Kofu?
August is the warmest month in Kofu, with an average high of 33°C.
What is the coldest month in Kofu?
January is the coldest month in Kofu, with an average low of -3°C.
What is the record high temperature in Kofu?
Within the available 1970–2026 station history, the record high at the Kofu station is 41°C, set on August 10, 2013. The record low is -11°C, on January 6, 1986.
What is the sunniest month in Kofu?
December is the sunniest month in Kofu, with estimated sunshine of 61% of daylight hours from ERA5 cloud cover. June is the cloudiest.
When is the first frost in Kofu?
The first fall freeze in Kofu typically comes around November 27. The last spring freeze is around March 26.
What is the best time to visit Kofu?
The most comfortable time to visit is typically April to May and October to November, when daytime highs sit near 21°C.