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Nagaoka, Niigata Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Nagaoka, Niigata?
Nagaoka, Niigata gets 1716 mm of precipitation a year over about 171 rainy days. August is the warmest month (average high 31°C) and January the coldest (average low 0°C).
Humid subtropical climate
Nagaoka, Niigata has hot summers and chilly winters. Daytime highs range from about 6°C in January to 31°C in August. July is usually the wettest month. The most comfortable time to visit is typically May to June and September to October, when daytime highs sit near 23°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 1° | 7° |
| Spring | Mar–May | 7° | 16° |
| Summer | Jun–Aug | 21° | 28° |
| Autumn | Sep–Nov | 13° | 21° |
How much rain does Nagaoka get?
Nagaoka gets 1716 mm of precipitation in an average year, spread over about 171 days with measurable rain. That is more rainy days than 94% of Japan.
July is the wettest month, with 216 mm. May is the driest, with 85 mm. January has the most rainy days, about 22.
The longest dry spell in the last five years lasted 38 days, to August 27, 2023.
From October 2025 to September 2026 Nagaoka got 2094 mm of rain, against a normal of 1716 mm for those months. September 2026 had the most, with 1233 mm.
Nagaoka weather by month
Nagaoka weather in January
In January, Nagaoka averages a high of 6°C and a low of 0°C. It gets 177 mm of precipitation over about 22 rainy days. Estimated sunshine is 22% of daylight hours, derived from ERA5 cloud cover. The January record high is 16°C (1997) and the record low is -8°C (1984).
Nagaoka weather in February
In February, Nagaoka averages a high of 7°C and a low of 0°C. It gets 115 mm of precipitation over about 18 rainy days. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. The February record high is 21°C (2004) and the record low is -11°C (1978).
Nagaoka weather in March
In March, Nagaoka averages a high of 10°C and a low of 2°C. It gets 99 mm of precipitation over about 15 rainy days. Estimated sunshine is 33% of daylight hours, derived from ERA5 cloud cover. The March record high is 24°C (2004) and the record low is -6°C (1971).
Nagaoka weather in April
In April, Nagaoka averages a high of 16°C and a low of 7°C. It gets 89 mm of precipitation over about 12 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The April record high is 31°C (1987) and the record low is -2°C (1970).
Nagaoka weather in May
In May, Nagaoka averages a high of 22°C and a low of 12°C. It gets 85 mm of precipitation over about 9 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The May record high is 33°C (1998) and the record low is 4°C (1991). May is one of the most comfortable months to visit.
Nagaoka weather in June
In June, Nagaoka averages a high of 25°C and a low of 17°C. It gets 110 mm of precipitation over about 10 rainy days. Estimated sunshine is 31% of daylight hours, derived from ERA5 cloud cover. The June record high is 34°C (2004) and the record low is 9°C (1973). June is one of the most comfortable months to visit.
Nagaoka weather in July
In July, Nagaoka averages a high of 29°C and a low of 22°C. It gets 216 mm of precipitation over about 13 rainy days. Estimated sunshine is 28% of daylight hours, derived from ERA5 cloud cover. The July record high is 38°C (2018) and the record low is 12°C (2026).
Nagaoka weather in August
In August, Nagaoka averages a high of 31°C and a low of 23°C. It gets 146 mm of precipitation over about 9 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The August record high is 40°C (2018) and the record low is 15°C (1976).
Nagaoka weather in September
In September, Nagaoka averages a high of 27°C and a low of 19°C. It gets 132 mm of precipitation over about 12 rainy days. Estimated sunshine is 33% of daylight hours, derived from ERA5 cloud cover. The September record high is 37°C (2002) and the record low is 9°C (1976). September is one of the most comfortable months to visit.
Nagaoka weather in October
In October, Nagaoka averages a high of 21°C and a low of 13°C. It gets 145 mm of precipitation over about 13 rainy days. Estimated sunshine is 34% of daylight hours, derived from ERA5 cloud cover. The October record high is 33°C (2018) and the record low is 3°C (1983). October is one of the most comfortable months to visit.
Nagaoka weather in November
In November, Nagaoka averages a high of 14°C and a low of 7°C. It gets 187 mm of precipitation over about 17 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The November record high is 27°C (1977) and the record low is -2°C (1970).
Nagaoka weather in December
In December, Nagaoka averages a high of 9°C and a low of 2°C. It gets 215 mm of precipitation over about 22 rainy days. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. The December record high is 21°C (2025) and the record low is -7°C (1983).
Sunshine, humidity and wind in Nagaoka
April is the sunniest month in Nagaoka, with estimated sunshine of 40% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 21%. The annual cloud-cover estimate is 31% of daylight hours; it is not a measurement of sunshine duration. Nagaoka is cloudier than 94% of Japan.
Humidity peaks in December at 83% and is lowest in April at 66%.
Nagaoka has about 16 days a year above 32°C. Nagaoka is cooler than 57% of Japan.
First and last freeze in Nagaoka
The first fall freeze in Nagaoka typically comes around December 18, and the last spring freeze around March 21. That leaves a frost-free growing season of about 272 days.
Nagaoka weather records
These records cover NIIGATA during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Nagaoka station is 40°C, on August 23, 2018. The coldest is -11°C, on February 17, 1978.
The wettest day in the available station history brought 273 mm of precipitation, on September 7, 2026.
43 all-time records have been set at the station since 1970.
The best time to visit Nagaoka
The most comfortable time to visit is typically May to June and September to October, when daytime highs sit near 23°C.
Winter (December–February) is chilly, with average highs around 7°C and lows near 1°C.
Spring (March–May) is mild, with average highs around 16°C and lows near 7°C.
Summer (June–August) is hot, with average highs around 28°C and lows near 21°C. It can feel humid.
Autumn (September–November) is warm, with average highs around 21°C and lows near 13°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 0° | 6° | 177 mm | 22 | 80% | 22% | 16° | -8° |
| February | 0° | 7° | 115 mm | 18 | 75% | 27% | 21° | -11° |
| March | 2° | 10° | 99 mm | 15 | 69% | 33% | 24° | -6° |
| April | 7° | 16° | 89 mm | 12 | 66% | 40% | 31° | -2° |
| May | 12° | 22° | 85 mm | 9 | 68% | 36% | 33° | 4° |
| June | 17° | 25° | 110 mm | 10 | 73% | 31% | 34° | 9° |
| July | 22° | 29° | 216 mm | 13 | 81% | 28% | 38° | 12° |
| August | 23° | 31° | 146 mm | 9 | 75% | 36% | 40° | 15° |
| September | 19° | 27° | 132 mm | 12 | 77% | 33% | 37° | 9° |
| October | 13° | 21° | 145 mm | 13 | 77% | 34% | 33° | 3° |
| November | 7° | 14° | 187 mm | 17 | 76% | 36% | 27° | -2° |
| December | 2° | 9° | 215 mm | 22 | 83% | 21% | 21° | -7° |
Station: NIIGATA, 55 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.
Nagaoka climate questions
How much rain does Nagaoka get?
Nagaoka gets 1716 mm of precipitation in an average year, over about 171 rainy days.
What is the wettest month in Nagaoka?
July is the wettest month in Nagaoka, with 216 mm. May is the driest, with 85 mm.
How many rainy days does Nagaoka have a year?
Nagaoka has about 171 days with measurable rain in an average year. January has the most, about 22.
What is the hottest month in Nagaoka?
August is the warmest month in Nagaoka, with an average high of 31°C.
What is the coldest month in Nagaoka?
January is the coldest month in Nagaoka, with an average low of 0°C.
What is the record high temperature in Nagaoka?
Within the available 1970–2026 station history, the record high at the Nagaoka station is 40°C, set on August 23, 2018. The record low is -11°C, on February 17, 1978.
What is the sunniest month in Nagaoka?
April is the sunniest month in Nagaoka, with estimated sunshine of 40% of daylight hours from ERA5 cloud cover. December is the cloudiest.
When is the first frost in Nagaoka?
The first fall freeze in Nagaoka typically comes around December 18. The last spring freeze is around March 21.
What is the best time to visit Nagaoka?
The most comfortable time to visit is typically May to June and September to October, when daytime highs sit near 23°C.