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Nagano, Nagano Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Nagano, Nagano?
Nagano, Nagano gets 886 mm of precipitation a year over about 115 rainy days. August is the warmest month (average high 31°C) and January the coldest (average low -4°C).
Humid continental climate
Nagano, Nagano has hot summers and chilly winters. Daytime highs range from about 4°C in January to 31°C in August. July is usually the wettest month. The most comfortable time to visit is typically April to June and September to October, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -4° | 6° |
| Spring | Mar–May | 4° | 17° |
| Summer | Jun–Aug | 19° | 29° |
| Autumn | Sep–Nov | 9° | 19° |
How much rain does Nagano get?
Nagano gets 886 mm of precipitation in an average year, spread over about 115 days with measurable rain. That is more rainy days than 50% of Japan.
July is the wettest month, with 124 mm. November is the driest, with 38 mm. January has the most rainy days, about 12.
The longest dry spell in the last five years lasted 17 days, to November 6, 2023.
From October 2025 to September 2026 Nagano got 2432 mm of rain, against a normal of 886 mm for those months. September 2026 had the most, with 1383 mm.
Nagano weather by month
Nagano weather in January
In January, Nagano averages a high of 4°C and a low of -4°C. It gets 52 mm of precipitation over about 12 rainy days. Estimated sunshine is 29% of daylight hours, derived from ERA5 cloud cover. The January record high is 16°C (1982) and the record low is -13°C (1970).
Nagano weather in February
In February, Nagano averages a high of 6°C and a low of -4°C. It gets 48 mm of precipitation over about 10 rainy days. Estimated sunshine is 31% of daylight hours, derived from ERA5 cloud cover. The February record high is 21°C (2010) and the record low is -13°C (1977).
Nagano weather in March
In March, Nagano averages a high of 11°C and a low of -1°C. It gets 55 mm of precipitation over about 10 rainy days. Estimated sunshine is 35% of daylight hours, derived from ERA5 cloud cover. The March record high is 28°C (2025) and the record low is -9°C (1977).
Nagano weather in April
In April, Nagano averages a high of 17°C and a low of 4°C. It gets 57 mm of precipitation over about 9 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The April record high is 31°C (2004) and the record low is -5°C (1987). April is one of the most comfortable months to visit.
Nagano weather in May
In May, Nagano averages a high of 23°C and a low of 10°C. It gets 64 mm of precipitation over about 8 rainy days. Estimated sunshine is 32% of daylight hours, derived from ERA5 cloud cover. The May record high is 34°C (2019) and the record low is 1°C (1972). May is one of the most comfortable months to visit.
Nagano weather in June
In June, Nagano averages a high of 26°C and a low of 16°C. It gets 97 mm of precipitation over about 10 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The June record high is 36°C (2022) and the record low is 6°C (1978). June is one of the most comfortable months to visit.
Nagano weather in July
In July, Nagano averages a high of 30°C and a low of 20°C. It gets 124 mm of precipitation over about 12 rainy days. Estimated sunshine is 22% of daylight hours, derived from ERA5 cloud cover. The July record high is 37°C (2022) and the record low is 12°C (1976).
Nagano weather in August
In August, Nagano averages a high of 31°C and a low of 21°C. It gets 94 mm of precipitation over about 9 rainy days. Estimated sunshine is 30% of daylight hours, derived from ERA5 cloud cover. The August record high is 39°C (1994) and the record low is 12°C (1971).
Nagano weather in September
In September, Nagano averages a high of 26°C and a low of 17°C. It gets 114 mm of precipitation over about 9 rainy days. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. The September record high is 36°C (2002) and the record low is 7°C (1992). September is one of the most comfortable months to visit.
Nagano weather in October
In October, Nagano averages a high of 19°C and a low of 9°C. It gets 100 mm of precipitation over about 7 rainy days. Estimated sunshine is 32% of daylight hours, derived from ERA5 cloud cover. The October record high is 31°C (1998) and the record low is -2°C (1983). October is one of the most comfortable months to visit.
Nagano weather in November
In November, Nagano averages a high of 13°C and a low of 3°C. It gets 38 mm of precipitation over about 7 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The November record high is 26°C (1977) and the record low is -4°C (1973).
Nagano weather in December
In December, Nagano averages a high of 7°C and a low of -2°C. It gets 44 mm of precipitation over about 10 rainy days. Estimated sunshine is 33% of daylight hours, derived from ERA5 cloud cover. The December record high is 22°C (2018) and the record low is -11°C (1973).
Sunshine, humidity and wind in Nagano
November is the sunniest month in Nagano, with estimated sunshine of 40% of daylight hours from ERA5 cloud cover. July is the cloudiest, at 22%. The annual cloud-cover estimate is 31% of daylight hours; it is not a measurement of sunshine duration. Nagano is cloudier than 95% of Japan.
Humidity peaks in July at 81% and is lowest in April at 64%.
Nagano has about 23 days a year above 32°C. Nagano is hotter than 59% of Japan.
First and last freeze in Nagano
The first fall freeze in Nagano typically comes around November 15, and the last spring freeze around April 10. That leaves a frost-free growing season of about 219 days.
Nagano weather records
These records cover NAGANO during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Nagano station is 39°C, on August 16, 1994. The coldest is -13°C, on February 1, 1977.
The wettest day in the available station history brought 314 mm of precipitation, on July 6, 2026.
42 all-time records have been set at the station since 1970.
The best time to visit Nagano
The most comfortable time to visit is typically April to June and September to October, when daytime highs sit near 22°C.
Winter (December–February) is chilly, with average highs around 5°C and lows near -4°C.
Spring (March–May) is mild, with average highs around 17°C and lows near 4°C.
Summer (June–August) is hot, with average highs around 29°C and lows near 19°C. It can feel humid.
Autumn (September–November) is mild, with average highs around 20°C and lows near 10°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -4° | 4° | 52 mm | 12 | 77% | 29% | 16° | -13° |
| February | -4° | 6° | 48 mm | 10 | 72% | 31% | 21° | -13° |
| March | -1° | 11° | 55 mm | 10 | 68% | 35% | 28° | -9° |
| April | 4° | 17° | 57 mm | 9 | 64% | 38% | 31° | -5° |
| May | 10° | 23° | 64 mm | 8 | 65% | 32% | 34° | 1° |
| June | 16° | 26° | 97 mm | 10 | 73% | 24% | 36° | 6° |
| July | 20° | 30° | 124 mm | 12 | 81% | 22% | 37° | 12° |
| August | 21° | 31° | 94 mm | 9 | 78% | 30% | 39° | 12° |
| September | 17° | 26° | 114 mm | 9 | 80% | 27% | 36° | 7° |
| October | 9° | 19° | 100 mm | 7 | 79% | 32% | 31° | -2° |
| November | 3° | 13° | 38 mm | 7 | 77% | 40% | 26° | -4° |
| December | -2° | 7° | 44 mm | 10 | 77% | 33% | 22° | -11° |
Station: NAGANO, 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.
Nagano climate questions
How much rain does Nagano get?
Nagano gets 886 mm of precipitation in an average year, over about 115 rainy days.
What is the wettest month in Nagano?
July is the wettest month in Nagano, with 124 mm. November is the driest, with 38 mm.
How many rainy days does Nagano have a year?
Nagano has about 115 days with measurable rain in an average year. January has the most, about 12.
What is the hottest month in Nagano?
August is the warmest month in Nagano, with an average high of 31°C.
What is the coldest month in Nagano?
January is the coldest month in Nagano, with an average low of -4°C.
What is the record high temperature in Nagano?
Within the available 1970–2026 station history, the record high at the Nagano station is 39°C, set on August 16, 1994. The record low is -13°C, on February 1, 1977.
What is the sunniest month in Nagano?
November is the sunniest month in Nagano, with estimated sunshine of 40% of daylight hours from ERA5 cloud cover. July is the cloudiest.
When is the first frost in Nagano?
The first fall freeze in Nagano typically comes around November 15. The last spring freeze is around April 10.
What is the best time to visit Nagano?
The most comfortable time to visit is typically April to June and September to October, when daytime highs sit near 22°C.