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Ōta, Gunma Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Ōta, Gunma?
Ōta, Gunma gets 1153 mm of precipitation a year over about 93 rainy days. August is the warmest month (average high 32°C) and January the coldest (average low -1°C).
Humid subtropical climate
Ōta, Gunma has hot summers and chilly winters. Daytime highs range from about 10°C in January to 32°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 | 0° | 11° |
| Spring | Mar–May | 8° | 20° |
| Summer | Jun–Aug | 21° | 31° |
| Autumn | Sep–Nov | 13° | 22° |
How much rain does Ōta get?
Ōta gets 1153 mm of precipitation in an average year, spread over about 93 days with measurable rain. That is fewer rainy days than 88% of Japan.
September is the wettest month, with 187 mm. February is the driest, with 29 mm. June has the most rainy days, about 12.
The longest dry spell in the last five years lasted 27 days, to January 12, 2024.
From October 2025 to September 2026 Ōta got 1755 mm of rain, against a normal of 1153 mm for those months. July 2026 had the most, with 738 mm.
Ōta weather by month
Ōta weather in January
In January, Ōta averages a high of 10°C and a low of -1°C. It gets 32 mm of precipitation over about 3 rainy days. Estimated sunshine is 60% of daylight hours, derived from ERA5 cloud cover. The January record high is 19°C (1996) and the record low is -8°C (1976).
Ōta weather in February
In February, Ōta averages a high of 11°C and a low of -1°C. It gets 29 mm of precipitation over about 5 rainy days. Estimated sunshine is 57% of daylight hours, derived from ERA5 cloud cover. The February record high is 24°C (1993) and the record low is -7°C (1977).
Ōta weather in March
In March, Ōta averages a high of 14°C and a low of 3°C. It gets 61 mm of precipitation over about 7 rainy days. Estimated sunshine is 46% of daylight hours, derived from ERA5 cloud cover. The March record high is 27°C (1998) and the record low is -8°C (1977).
Ōta weather in April
In April, Ōta averages a high of 20°C and a low of 8°C. It gets 82 mm of precipitation over about 8 rainy days. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. The April record high is 31°C (2015) and the record low is -1°C (1981). April is one of the most comfortable months to visit.
Ōta weather in May
In May, Ōta averages a high of 25°C and a low of 13°C. It gets 100 mm of precipitation over about 9 rainy days. Estimated sunshine is 33% of daylight hours, derived from ERA5 cloud cover. The May record high is 36°C (2019) and the record low is 4°C (1993). May is one of the most comfortable months to visit.
Ōta weather in June
In June, Ōta averages a high of 27°C and a low of 18°C. It gets 141 mm of precipitation over about 12 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The June record high is 40°C (2011) and the record low is 10°C (1981).
Ōta weather in July
In July, Ōta averages a high of 31°C and a low of 22°C. It gets 135 mm of precipitation over about 12 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The July record high is 41°C (2018) and the record low is 12°C (1976).
Ōta weather in August
In August, Ōta averages a high of 32°C and a low of 23°C. It gets 146 mm of precipitation over about 9 rainy days. Estimated sunshine is 32% of daylight hours, derived from ERA5 cloud cover. The August record high is 41°C (2007) and the record low is 16°C (1976).
Ōta weather in September
In September, Ōta averages a high of 28°C and a low of 19°C. It gets 187 mm of precipitation over about 11 rainy days. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. The September record high is 39°C (2000) and the record low is 11°C (1992).
Ōta weather in October
In October, Ōta averages a high of 22°C and a low of 13°C. It gets 164 mm of precipitation over about 9 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The October record high is 34°C (2018) and the record low is 3°C (1971). October is one of the most comfortable months to visit.
Ōta weather in November
In November, Ōta averages a high of 17°C and a low of 7°C. It gets 46 mm of precipitation over about 5 rainy days. Estimated sunshine is 61% of daylight hours, derived from ERA5 cloud cover. The November record high is 27°C (2023) and the record low is -2°C (1971). November is one of the most comfortable months to visit.
Ōta weather in December
In December, Ōta averages a high of 12°C and a low of 1°C. It gets 30 mm of precipitation over about 4 rainy days. Estimated sunshine is 65% of daylight hours, derived from ERA5 cloud cover. The December record high is 26°C (2004) and the record low is -7°C (1976).
Sunshine, humidity and wind in Ōta
December is the sunniest month in Ōta, with estimated sunshine of 65% of daylight hours from ERA5 cloud cover. June is the cloudiest, at 24%. The annual cloud-cover estimate is 43% of daylight hours; it is not a measurement of sunshine duration. Ōta is sunnier than 90% of Japan.
Humidity peaks in September at 79% and is lowest in February at 55%.
Ōta has about 37 days a year above 32°C. Ōta is hotter than 93% of Japan.
First and last freeze in Ōta
The first fall freeze in Ōta typically comes around December 6, and the last spring freeze around March 19. That leaves a frost-free growing season of about 262 days.
Ōta weather records
These records cover KUMAGAYA during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Ōta station is 41°C, on July 23, 2018. The coldest is -8°C, on January 22, 1976.
The wettest day in the available station history brought 301 mm of precipitation, on September 12, 1982.
36 all-time records have been set at the station since 1970.
The best time to visit Ōta
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 20°C and lows near 8°C.
Summer (June–August) is hot, with average highs around 30°C and lows near 21°C. It can feel humid.
Autumn (September–November) is warm, with average highs around 22°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° | 32 mm | 3 | 58% | 60% | 19° | -8° |
| February | -1° | 11° | 29 mm | 5 | 55% | 57% | 24° | -7° |
| March | 3° | 14° | 61 mm | 7 | 59% | 46% | 27° | -8° |
| April | 8° | 20° | 82 mm | 8 | 61% | 43% | 31° | -1° |
| May | 13° | 25° | 100 mm | 9 | 67% | 33% | 36° | 4° |
| June | 18° | 27° | 141 mm | 12 | 74% | 24% | 40° | 10° |
| July | 22° | 31° | 135 mm | 12 | 77% | 24% | 41° | 12° |
| August | 23° | 32° | 146 mm | 9 | 77% | 32% | 41° | 16° |
| September | 19° | 28° | 187 mm | 11 | 79% | 26% | 39° | 11° |
| October | 13° | 22° | 164 mm | 9 | 72% | 42% | 34° | 3° |
| November | 7° | 17° | 46 mm | 5 | 67% | 61% | 27° | -2° |
| December | 1° | 12° | 30 mm | 4 | 61% | 65% | 26° | -7° |
Station: KUMAGAYA, 17 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.
Ōta climate questions
How much rain does Ōta get?
Ōta gets 1153 mm of precipitation in an average year, over about 93 rainy days.
What is the wettest month in Ōta?
September is the wettest month in Ōta, with 187 mm. February is the driest, with 29 mm.
How many rainy days does Ōta have a year?
Ōta has about 93 days with measurable rain in an average year. June has the most, about 12.
What is the hottest month in Ōta?
August is the warmest month in Ōta, with an average high of 32°C.
What is the coldest month in Ōta?
January is the coldest month in Ōta, with an average low of -1°C.
What is the record high temperature in Ōta?
Within the available 1970–2026 station history, the record high at the Ōta station is 41°C, set on July 23, 2018. The record low is -8°C, on January 22, 1976.
What is the sunniest month in Ōta?
December is the sunniest month in Ōta, with estimated sunshine of 65% of daylight hours from ERA5 cloud cover. June is the cloudiest.
When is the first frost in Ōta?
The first fall freeze in Ōta typically comes around December 6. The last spring freeze is around March 19.
What is the best time to visit Ōta?
The most comfortable time to visit is typically April to May and October to November, when daytime highs sit near 21°C.