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Narashino, Chiba Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Narashino, Chiba?
Narashino, Chiba gets 1299 mm of precipitation a year over about 98 rainy days. August is the warmest month (average high 31°C) and January the coldest (average low 2°C).
Humid subtropical climate
Narashino, Chiba has hot summers and chilly winters. Daytime highs range from about 10°C in January to 31°C in August. September is usually the wettest month. The most comfortable time to visit is typically April to June and October to November, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 3° | 11° |
| Spring | Mar–May | 10° | 18° |
| Summer | Jun–Aug | 22° | 29° |
| Autumn | Sep–Nov | 15° | 22° |
How much rain does Narashino get?
Narashino gets 1299 mm of precipitation in an average year, spread over about 98 days with measurable rain. That is fewer rainy days than 81% of Japan.
September is the wettest month, with 198 mm. December is the driest, with 51 mm. June has the most rainy days, about 11.
The longest dry spell in the last five years lasted 25 days, to February 5, 2022.
From October 2025 to September 2026 Narashino got 1572 mm of rain, against a normal of 1299 mm for those months. July 2026 had the most, with 627 mm.
Narashino weather by month
Narashino weather in January
In January, Narashino averages a high of 10°C and a low of 2°C. It gets 59 mm of precipitation over about 5 rainy days. Estimated sunshine is 57% of daylight hours, derived from ERA5 cloud cover. The January record high is 19°C (1989) and the record low is -5°C (1981).
Narashino weather in February
In February, Narashino averages a high of 11°C and a low of 2°C. It gets 55 mm of precipitation over about 6 rainy days. Estimated sunshine is 56% of daylight hours, derived from ERA5 cloud cover. The February record high is 24°C (2009) and the record low is -4°C (1977).
Narashino weather in March
In March, Narashino averages a high of 14°C and a low of 5°C. It gets 97 mm of precipitation over about 9 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The March record high is 26°C (2013) and the record low is -4°C (1977).
Narashino weather in April
In April, Narashino averages a high of 19°C and a low of 10°C. It gets 101 mm of precipitation over about 9 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The April record high is 29°C (2004) and the record low is 1°C (2001). April is one of the most comfortable months to visit.
Narashino weather in May
In May, Narashino averages a high of 23°C and a low of 15°C. It gets 108 mm of precipitation over about 9 rainy days. Estimated sunshine is 28% of daylight hours, derived from ERA5 cloud cover. The May record high is 32°C (2026) and the record low is 7°C (1993). May is one of the most comfortable months to visit.
Narashino weather in June
In June, Narashino averages a high of 26°C and a low of 19°C. It gets 141 mm of precipitation over about 11 rainy days. Estimated sunshine is 22% of daylight hours, derived from ERA5 cloud cover. The June record high is 37°C (2022) and the record low is 11°C (1981). June is one of the most comfortable months to visit.
Narashino weather in July
In July, Narashino averages a high of 29°C and a low of 23°C. It gets 118 mm of precipitation over about 10 rainy days. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. The July record high is 38°C (2004) and the record low is 12°C (1976).
Narashino weather in August
In August, Narashino averages a high of 31°C and a low of 24°C. It gets 101 mm of precipitation over about 8 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The August record high is 38°C (2015) and the record low is 17°C (1980).
Narashino weather in September
In September, Narashino averages a high of 28°C and a low of 21°C. It gets 198 mm of precipitation over about 10 rainy days. Estimated sunshine is 32% of daylight hours, derived from ERA5 cloud cover. The September record high is 36°C (2010) and the record low is 13°C (2003).
Narashino weather in October
In October, Narashino averages a high of 22°C and a low of 15°C. It gets 187 mm of precipitation over about 9 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The October record high is 33°C (2016) and the record low is 6°C (1983). October is one of the most comfortable months to visit.
Narashino weather in November
In November, Narashino averages a high of 17°C and a low of 9°C. It gets 83 mm of precipitation over about 7 rainy days. Estimated sunshine is 54% of daylight hours, derived from ERA5 cloud cover. The November record high is 28°C (2023) and the record low is 0°C (1971). November is one of the most comfortable months to visit.
Narashino weather in December
In December, Narashino averages a high of 13°C and a low of 4°C. It gets 51 mm of precipitation over about 6 rainy days. Estimated sunshine is 62% of daylight hours, derived from ERA5 cloud cover. The December record high is 24°C (2023) and the record low is -3°C (1984).
Sunshine, humidity and wind in Narashino
December is the sunniest month in Narashino, with estimated sunshine of 62% of daylight hours from ERA5 cloud cover. June is the cloudiest, at 22%. The annual cloud-cover estimate is 42% of daylight hours; it is not a measurement of sunshine duration. Narashino is sunnier than 76% of Japan.
Humidity peaks in July at 80% and is lowest in February at 62%.
Narashino has about 18 days a year above 32°C. Narashino is cooler than 55% of Japan.
First and last freeze in Narashino
The first fall freeze in Narashino typically comes around December 18, and the last spring freeze around February 18. That leaves a frost-free growing season of about 303 days.
Narashino weather records
These records cover CHIBA during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Narashino station is 38°C, on August 7, 2015. The coldest is -5°C, on January 17, 1970.
The wettest day in the available station history brought 288 mm of precipitation, on August 25, 2026.
49 all-time records have been set at the station since 1970.
The best time to visit Narashino
The most comfortable time to visit is typically April to June and October to November, when daytime highs sit near 22°C.
Winter (December–February) is chilly, with average highs around 11°C and lows near 3°C.
Spring (March–May) is mild, with average highs around 19°C and lows near 10°C.
Summer (June–August) is hot, with average highs around 29°C and lows near 22°C. It can feel humid.
Autumn (September–November) is warm, with average highs around 22°C and lows near 15°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 2° | 10° | 59 mm | 5 | 64% | 57% | 19° | -5° |
| February | 2° | 11° | 55 mm | 6 | 62% | 56% | 24° | -4° |
| March | 5° | 14° | 97 mm | 9 | 67% | 42% | 26° | -4° |
| April | 10° | 19° | 101 mm | 9 | 68% | 39% | 29° | 1° |
| May | 15° | 23° | 108 mm | 9 | 73% | 28% | 32° | 7° |
| June | 19° | 26° | 141 mm | 11 | 79% | 22% | 37° | 11° |
| July | 23° | 29° | 118 mm | 10 | 80% | 27% | 38° | 12° |
| August | 24° | 31° | 101 mm | 8 | 78% | 40% | 38° | 17° |
| September | 21° | 28° | 198 mm | 10 | 80% | 32% | 36° | 13° |
| October | 15° | 22° | 187 mm | 9 | 76% | 40% | 33° | 6° |
| November | 9° | 17° | 83 mm | 7 | 72% | 54% | 28° | 0° |
| December | 4° | 13° | 51 mm | 6 | 66% | 62% | 24° | -3° |
Station: CHIBA, 11 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.
Narashino climate questions
How much rain does Narashino get?
Narashino gets 1299 mm of precipitation in an average year, over about 98 rainy days.
What is the wettest month in Narashino?
September is the wettest month in Narashino, with 198 mm. December is the driest, with 51 mm.
How many rainy days does Narashino have a year?
Narashino has about 98 days with measurable rain in an average year. June has the most, about 11.
What is the hottest month in Narashino?
August is the warmest month in Narashino, with an average high of 31°C.
What is the coldest month in Narashino?
January is the coldest month in Narashino, with an average low of 2°C.
What is the record high temperature in Narashino?
Within the available 1970–2026 station history, the record high at the Narashino station is 38°C, set on August 7, 2015. The record low is -5°C, on January 17, 1970.
What is the sunniest month in Narashino?
December is the sunniest month in Narashino, with estimated sunshine of 62% of daylight hours from ERA5 cloud cover. June is the cloudiest.
When is the first frost in Narashino?
The first fall freeze in Narashino typically comes around December 18. The last spring freeze is around February 18.
What is the best time to visit Narashino?
The most comfortable time to visit is typically April to June and October to November, when daytime highs sit near 22°C.