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Niihama, Ehime Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Niihama, Ehime?
Niihama, Ehime gets 2330 mm of precipitation a year over about 104 rainy days. August is the warmest month (average high 32°C) and January the coldest (average low 1°C).
Humid subtropical climate
Niihama, Ehime has hot summers and mild winters. Daytime highs range from about 12°C in January to 32°C in August. June 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 23°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 2° | 13° |
| Spring | Mar–May | 10° | 21° |
| Summer | Jun–Aug | 22° | 30° |
| Autumn | Sep–Nov | 15° | 25° |
How much rain does Niihama get?
Niihama gets 2330 mm of precipitation in an average year, spread over about 104 days with measurable rain. That is fewer rainy days than 64% of Japan.
June is the wettest month, with 349 mm. January is the driest, with 46 mm. June has the most rainy days, about 14.
The longest dry spell in the last five years lasted 45 days, to February 9, 2026.
From October 2025 to September 2026 Niihama got 4485 mm of rain, against a normal of 2330 mm for those months. September 2026 had the most, with 1980 mm.
Niihama weather by month
Niihama weather in January
In January, Niihama averages a high of 12°C and a low of 1°C. It gets 46 mm of precipitation over about 4 rainy days. Estimated sunshine is 45% of daylight hours, derived from ERA5 cloud cover. The January record high is 23°C (1989) and the record low is -6°C (1986).
Niihama weather in February
In February, Niihama averages a high of 13°C and a low of 2°C. It gets 82 mm of precipitation over about 6 rainy days. Estimated sunshine is 44% of daylight hours, derived from ERA5 cloud cover. The February record high is 24°C (2009) and the record low is -8°C (1977).
Niihama weather in March
In March, Niihama averages a high of 17°C and a low of 6°C. It gets 161 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 (2025) and the record low is -6°C (1977).
Niihama weather in April
In April, Niihama averages a high of 21°C and a low of 10°C. It gets 213 mm of precipitation over about 8 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The April record high is 29°C (1998) and the record low is 0°C (1974). April is one of the most comfortable months to visit.
Niihama weather in May
In May, Niihama averages a high of 25°C and a low of 15°C. It gets 238 mm of precipitation over about 9 rainy days. Estimated sunshine is 34% of daylight hours, derived from ERA5 cloud cover. The May record high is 32°C (2008) and the record low is 6°C (1980). May is one of the most comfortable months to visit.
Niihama weather in June
In June, Niihama averages a high of 27°C and a low of 19°C. It gets 349 mm of precipitation over about 14 rainy days. Estimated sunshine is 23% of daylight hours, derived from ERA5 cloud cover. The June record high is 34°C (1981) and the record low is 12°C (1978).
Niihama weather in July
In July, Niihama averages a high of 31°C and a low of 23°C. It gets 323 mm of precipitation over about 12 rainy days. Estimated sunshine is 28% of daylight hours, derived from ERA5 cloud cover. The July record high is 38°C (2001) and the record low is 11°C (2026).
Niihama weather in August
In August, Niihama averages a high of 32°C and a low of 24°C. It gets 226 mm of precipitation over about 11 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The August record high is 38°C (2016) and the record low is 18°C (1981).
Niihama weather in September
In September, Niihama averages a high of 29°C and a low of 21°C. It gets 337 mm of precipitation over about 11 rainy days. Estimated sunshine is 34% of daylight hours, derived from ERA5 cloud cover. The September record high is 37°C (2007) and the record low is 11°C (1987).
Niihama weather in October
In October, Niihama averages a high of 25°C and a low of 15°C. It gets 184 mm of precipitation over about 8 rainy days. Estimated sunshine is 48% of daylight hours, derived from ERA5 cloud cover. The October record high is 33°C (2025) and the record low is 4°C (1986). October is one of the most comfortable months to visit.
Niihama weather in November
In November, Niihama averages a high of 19°C and a low of 9°C. It gets 108 mm of precipitation over about 6 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The November record high is 28°C (1996) and the record low is -1°C (1976). November is one of the most comfortable months to visit.
Niihama weather in December
In December, Niihama averages a high of 14°C and a low of 4°C. It gets 64 mm of precipitation over about 6 rainy days. Estimated sunshine is 48% of daylight hours, derived from ERA5 cloud cover. The December record high is 23°C (2004) and the record low is -5°C (1976).
Sunshine, humidity and wind in Niihama
November is the sunniest month in Niihama, with estimated sunshine of 50% of daylight hours from ERA5 cloud cover. June is the cloudiest, at 23%. The annual cloud-cover estimate is 40% of daylight hours; it is not a measurement of sunshine duration. Niihama is sunnier than 62% of Japan.
Humidity peaks in July at 81% and is lowest in December at 69%.
Niihama has about 28 days a year above 32°C. Niihama is hotter than 73% of Japan.
First and last freeze in Niihama
The first fall freeze in Niihama typically comes around December 17, and the last spring freeze around March 2. That leaves a frost-free growing season of about 290 days.
Niihama weather records
These records cover KOCHI during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Niihama station is 38°C, on July 25, 2001. The coldest is -8°C, on February 17, 1977.
The wettest day in the available station history brought 724 mm of precipitation, on July 2, 2026.
34 all-time records have been set at the station since 1970.
The best time to visit Niihama
The most comfortable time to visit is typically April to May and October to November, when daytime highs sit near 23°C.
Winter (December–February) is mild, with average highs around 13°C and lows near 2°C.
Spring (March–May) is warm, with average highs around 21°C and lows near 10°C.
Summer (June–August) is hot, with average highs around 30°C and lows near 22°C. It can feel humid.
Autumn (September–November) is warm, with average highs around 25°C and lows near 15°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 1° | 12° | 46 mm | 4 | 70% | 45% | 23° | -6° |
| February | 2° | 13° | 82 mm | 6 | 70% | 44% | 24° | -8° |
| March | 6° | 17° | 161 mm | 9 | 72% | 42% | 26° | -6° |
| April | 10° | 21° | 213 mm | 8 | 70% | 40% | 29° | 0° |
| May | 15° | 25° | 238 mm | 9 | 74% | 34% | 32° | 6° |
| June | 19° | 27° | 349 mm | 14 | 80% | 23% | 34° | 12° |
| July | 23° | 31° | 323 mm | 12 | 81% | 28% | 38° | 11° |
| August | 24° | 32° | 226 mm | 11 | 78% | 40% | 38° | 18° |
| September | 21° | 29° | 337 mm | 11 | 78% | 34% | 37° | 11° |
| October | 15° | 25° | 184 mm | 8 | 73% | 48% | 33° | 4° |
| November | 9° | 19° | 108 mm | 6 | 73% | 50% | 28° | -1° |
| December | 4° | 14° | 64 mm | 6 | 69% | 48% | 23° | -5° |
Station: KOCHI, 49 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.
Niihama climate questions
How much rain does Niihama get?
Niihama gets 2330 mm of precipitation in an average year, over about 104 rainy days.
What is the wettest month in Niihama?
June is the wettest month in Niihama, with 349 mm. January is the driest, with 46 mm.
How many rainy days does Niihama have a year?
Niihama has about 104 days with measurable rain in an average year. June has the most, about 14.
What is the hottest month in Niihama?
August is the warmest month in Niihama, with an average high of 32°C.
What is the coldest month in Niihama?
January is the coldest month in Niihama, with an average low of 1°C.
What is the record high temperature in Niihama?
Within the available 1970–2026 station history, the record high at the Niihama station is 38°C, set on July 25, 2001. The record low is -8°C, on February 17, 1977.
What is the sunniest month in Niihama?
November is the sunniest month in Niihama, with estimated sunshine of 50% of daylight hours from ERA5 cloud cover. June is the cloudiest.
When is the first frost in Niihama?
The first fall freeze in Niihama typically comes around December 17. The last spring freeze is around March 2.
What is the best time to visit Niihama?
The most comfortable time to visit is typically April to May and October to November, when daytime highs sit near 23°C.