Seto, Aichi Weather by Month and Climate Averages

How much rain does Seto get?

Seto gets 1472 mm of precipitation in an average year, spread over about 99 days with measurable rain. That is fewer rainy days than 79% of Japan.

September is the wettest month, with 217 mm. January is the driest, with 46 mm. July has the most rainy days, about 12.

The longest dry spell in the last five years lasted 25 days, to February 7, 2026.

Seto weather by month

Seto weather in January

In January, Seto averages a high of 9°C and a low of 1°C. It gets 46 mm of precipitation over about 6 rainy days. The sun is out about 56% of daylight hours. The January record high is 18°C (2020) and the record low is -6°C (1970).

Seto weather in February

In February, Seto averages a high of 11°C and a low of 1°C. It gets 56 mm of precipitation over about 6 rainy days. The sun is out about 52% of daylight hours. The February record high is 23°C (2016) and the record low is -6°C (1977).

Seto weather in March

In March, Seto averages a high of 14°C and a low of 4°C. It gets 106 mm of precipitation over about 8 rainy days. The sun is out about 47% of daylight hours. The March record high is 25°C (2018) and the record low is -4°C (1977).

Seto weather in April

In April, Seto averages a high of 20°C and a low of 9°C. It gets 117 mm of precipitation over about 8 rainy days. The sun is out about 43% of daylight hours. The April record high is 31°C (2004) and the record low is 0°C (1972). April is one of the most comfortable months to visit.

Seto weather in May

In May, Seto averages a high of 25°C and a low of 14°C. It gets 135 mm of precipitation over about 9 rainy days. The sun is out about 34% of daylight hours. The May record high is 34°C (2019) and the record low is 6°C (1972). May is one of the most comfortable months to visit.

Seto weather in June

In June, Seto averages a high of 28°C and a low of 19°C. It gets 180 mm of precipitation over about 11 rainy days. The sun is out about 25% of daylight hours. The June record high is 38°C (2022) and the record low is 9°C (1991).

Seto weather in July

In July, Seto averages a high of 32°C and a low of 23°C. It gets 208 mm of precipitation over about 12 rainy days. The sun is out about 28% of daylight hours. The July record high is 39°C (2018) and the record low is 16°C (1976).

Seto weather in August

In August, Seto averages a high of 33°C and a low of 24°C. It gets 128 mm of precipitation over about 8 rainy days. The sun is out about 38% of daylight hours. The August record high is 41°C (2018) and the record low is 18°C (1981).

Seto weather in September

In September, Seto averages a high of 29°C and a low of 21°C. It gets 217 mm of precipitation over about 10 rainy days. The sun is out about 36% of daylight hours. The September record high is 38°C (2010) and the record low is 12°C (1976).

Seto weather in October

In October, Seto averages a high of 23°C and a low of 14°C. It gets 152 mm of precipitation over about 8 rainy days. The sun is out about 52% of daylight hours. The October record high is 32°C (2013) and the record low is 4°C (1983). October is one of the most comfortable months to visit.

Seto weather in November

In November, Seto averages a high of 17°C and a low of 8°C. It gets 74 mm of precipitation over about 6 rainy days. The sun is out about 60% of daylight hours. The November record high is 26°C (2009) and the record low is -1°C (1970). November is one of the most comfortable months to visit.

Seto weather in December

In December, Seto averages a high of 12°C and a low of 3°C. It gets 54 mm of precipitation over about 6 rainy days. The sun is out about 59% of daylight hours. The December record high is 23°C (2015) and the record low is -6°C (1973).

Sunshine, humidity and wind in Seto

November is the sunniest month in Seto, with sunshine about 60% of daylight hours. June is the cloudiest, at 25%. Over the year the sun shines about 44% of daylight hours. Seto is sunnier than 98% of Japan.

Humidity peaks in July at 78% and is lowest in February at 60%.

Seto has about 35 days a year above 32°C. Seto is hotter than 91% of Japan.

First and last freeze in Seto

The first fall freeze in Seto typically comes around December 19, and the last spring freeze around March 12. That leaves a frost-free growing season of about 282 days.

Seto weather records

The hottest temperature on record at the Seto station is 41°C, on August 3, 2018. The coldest is -6°C, on February 27, 1981.

The wettest day on record brought 341 mm of rain, on September 11, 2000.

41 all-time records have been set at the station since 1970.

The best time to visit Seto

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 1°C.

Spring (March–May) is mild, with average highs around 20°C and lows near 9°C.

Summer (June–August) is hot, with average highs around 31°C and lows near 22°C. It can feel humid.

Autumn (September–November) is warm, with average highs around 23°C and lows near 14°C.

Seto climate questions

How much rain does Seto get?

Seto gets 1472 mm of precipitation in an average year, over about 99 rainy days.

What is the wettest month in Seto?

September is the wettest month in Seto, with 217 mm. January is the driest, with 46 mm.

How many rainy days does Seto have a year?

Seto has about 99 days with measurable rain in an average year. July has the most, about 12.

What is the hottest month in Seto?

August is the warmest month in Seto, with an average high of 33°C.

What is the coldest month in Seto?

January is the coldest month in Seto, with an average low of 1°C.

What is the record high temperature in Seto?

The record high at the Seto station is 41°C, set on August 3, 2018. The record low is -6°C, on February 27, 1981.

What is the sunniest month in Seto?

November is the sunniest month in Seto, with sunshine about 60% of daylight hours. June is the cloudiest.

When is the first frost in Seto?

The first fall freeze in Seto typically comes around December 19. The last spring freeze is around March 12.

What is the best time to visit Seto?

The most comfortable time to visit is typically April to May and October to November, when daytime highs sit near 21°C.