Niihama, Ehime Weather by Month and Climate Averages

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.

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. The sun is out about 45% of daylight hours. 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. The sun is out about 44% of daylight hours. 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. The sun is out about 42% of daylight hours. 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. The sun is out about 40% of daylight hours. 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. The sun is out about 34% of daylight hours. 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. The sun is out about 23% of daylight hours. 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. The sun is out about 28% of daylight hours. 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. The sun is out about 40% of daylight hours. 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. The sun is out about 34% of daylight hours. 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. The sun is out about 48% of daylight hours. 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. The sun is out about 50% of daylight hours. 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. The sun is out about 48% of daylight hours. 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 sunshine about 50% of daylight hours. June is the cloudiest, at 23%. Over the year the sun shines about 40% of daylight hours. Niihama is sunnier than 62% of Japan.

Humidity peaks in July at 81% and is lowest in December at 69%.

Niihama has about 27 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

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 on record brought 525 mm of rain, on September 12, 1976.

33 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.

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?

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 sunshine about 50% of daylight hours. 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.