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Isehara, Kanagawa Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Isehara, Kanagawa?
Isehara, Kanagawa gets 1555 mm of precipitation a year over about 103 rainy days. August is the warmest month (average high 31°C) and January the coldest (average low 2°C).
Humid subtropical climate
Isehara, Kanagawa 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 | 11° | 19° |
| Summer | Jun–Aug | 22° | 29° |
| Autumn | Sep–Nov | 15° | 22° |
How much rain does Isehara get?
Isehara gets 1555 mm of precipitation in an average year, spread over about 103 days with measurable rain. That is fewer rainy days than 68% of Japan.
September is the wettest month, with 228 mm. January is the driest, with 56 mm. June has the most rainy days, about 12.
The longest dry spell in the last five years lasted 22 days, to January 13, 2023.
From October 2025 to September 2026 Isehara got 1432 mm of rain, against a normal of 1555 mm for those months. July 2026 had the most, with 793 mm.
Isehara weather by month
Isehara weather in January
In January, Isehara averages a high of 10°C and a low of 2°C. It gets 56 mm of precipitation over about 5 rainy days. Estimated sunshine is 58% of daylight hours, derived from ERA5 cloud cover. The January record high is 19°C (1996) and the record low is -5°C (1970).
Isehara weather in February
In February, Isehara averages a high of 11°C and a low of 3°C. It gets 57 mm of precipitation over about 6 rainy days. Estimated sunshine is 54% of daylight hours, derived from ERA5 cloud cover. The February record high is 25°C (2009) and the record low is -5°C (1984).
Isehara weather in March
In March, Isehara averages a high of 14°C and a low of 6°C. It gets 125 mm of precipitation over about 10 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The March record high is 25°C (2025) and the record low is -4°C (1971).
Isehara weather in April
In April, Isehara averages a high of 19°C and a low of 11°C. It gets 133 mm of precipitation over about 9 rainy days. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. The April record high is 28°C (2004) and the record low is 1°C (2001). April is one of the most comfortable months to visit.
Isehara weather in May
In May, Isehara averages a high of 23°C and a low of 15°C. It gets 135 mm of precipitation over about 9 rainy days. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. The May record high is 31°C (2019) and the record low is 8°C (1980). May is one of the most comfortable months to visit.
Isehara weather in June
In June, Isehara averages a high of 26°C and a low of 19°C. It gets 176 mm of precipitation over about 12 rainy days. Estimated sunshine is 19% of daylight hours, derived from ERA5 cloud cover. The June record high is 36°C (2022) and the record low is 12°C (1989). June is one of the most comfortable months to visit.
Isehara weather in July
In July, Isehara averages a high of 29°C and a low of 23°C. It gets 162 mm of precipitation over about 11 rainy days. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. The July record high is 37°C (2023) and the record low is 13°C (1976).
Isehara weather in August
In August, Isehara averages a high of 31°C and a low of 24°C. It gets 119 mm of precipitation over about 7 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The August record high is 37°C (2025) and the record low is 17°C (1977).
Isehara weather in September
In September, Isehara averages a high of 27°C and a low of 21°C. It gets 228 mm of precipitation over about 11 rainy days. Estimated sunshine is 29% of daylight hours, derived from ERA5 cloud cover. The September record high is 36°C (2000) and the record low is 13°C (2003).
Isehara weather in October
In October, Isehara averages a high of 22°C and a low of 15°C. It gets 208 mm of precipitation over about 10 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The October record high is 32°C (2018) and the record low is 6°C (1976). October is one of the most comfortable months to visit.
Isehara weather in November
In November, Isehara averages a high of 17°C and a low of 9°C. It gets 97 mm of precipitation over about 8 rainy days. Estimated sunshine is 53% of daylight hours, derived from ERA5 cloud cover. The November record high is 27°C (2023) and the record low is 1°C (1976). November is one of the most comfortable months to visit.
Isehara weather in December
In December, Isehara averages a high of 13°C and a low of 5°C. It gets 59 mm of precipitation over about 6 rainy days. Estimated sunshine is 65% of daylight hours, derived from ERA5 cloud cover. The December record high is 24°C (2023) and the record low is -3°C (1976).
Sunshine, humidity and wind in Isehara
December is the sunniest month in Isehara, with estimated sunshine of 65% of daylight hours from ERA5 cloud cover. June is the cloudiest, at 19%. The annual cloud-cover estimate is 40% of daylight hours; it is not a measurement of sunshine duration. Isehara is sunnier than 65% of Japan.
Humidity peaks in July at 82% and is lowest in February at 60%.
Isehara has about 20 days a year above 32°C. Isehara is cooler than 51% of Japan.
First and last freeze in Isehara
The first fall freeze in Isehara typically comes around December 21, and the last spring freeze around February 15. That leaves a frost-free growing season of about 309 days.
Isehara weather records
These records cover YOKOHAMA during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Isehara station is 37°C, on August 11, 2013. The coldest is -5°C, on January 17, 1970.
The wettest day in the available station history brought 374 mm of precipitation, on July 1, 2026.
45 all-time records have been set at the station since 1970.
The best time to visit Isehara
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° | 56 mm | 5 | 61% | 58% | 19° | -5° |
| February | 3° | 11° | 57 mm | 6 | 60% | 54% | 25° | -5° |
| March | 6° | 14° | 125 mm | 10 | 66% | 40% | 25° | -4° |
| April | 11° | 19° | 133 mm | 9 | 69% | 37% | 28° | 1° |
| May | 15° | 23° | 135 mm | 9 | 74% | 27% | 31° | 8° |
| June | 19° | 26° | 176 mm | 12 | 80% | 19% | 36° | 12° |
| July | 23° | 29° | 162 mm | 11 | 82% | 26% | 37° | 13° |
| August | 24° | 31° | 119 mm | 7 | 81% | 36% | 37° | 17° |
| September | 21° | 27° | 228 mm | 11 | 81% | 29% | 36° | 13° |
| October | 15° | 22° | 208 mm | 10 | 76% | 39% | 32° | 6° |
| November | 9° | 17° | 97 mm | 8 | 70% | 53% | 27° | 1° |
| December | 5° | 13° | 59 mm | 6 | 64% | 65% | 24° | -3° |
Station: YOKOHAMA, 31 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.
Isehara climate questions
How much rain does Isehara get?
Isehara gets 1555 mm of precipitation in an average year, over about 103 rainy days.
What is the wettest month in Isehara?
September is the wettest month in Isehara, with 228 mm. January is the driest, with 56 mm.
How many rainy days does Isehara have a year?
Isehara has about 103 days with measurable rain in an average year. June has the most, about 12.
What is the hottest month in Isehara?
August is the warmest month in Isehara, with an average high of 31°C.
What is the coldest month in Isehara?
January is the coldest month in Isehara, with an average low of 2°C.
What is the record high temperature in Isehara?
Within the available 1970–2026 station history, the record high at the Isehara station is 37°C, set on August 11, 2013. The record low is -5°C, on January 17, 1970.
What is the sunniest month in Isehara?
December is the sunniest month in Isehara, with estimated sunshine of 65% of daylight hours from ERA5 cloud cover. June is the cloudiest.
When is the first frost in Isehara?
The first fall freeze in Isehara typically comes around December 21. The last spring freeze is around February 15.
What is the best time to visit Isehara?
The most comfortable time to visit is typically April to June and October to November, when daytime highs sit near 22°C.