Iwaki, Fukushima Weather by Month and Climate Averages

How much rain does Iwaki get?

Iwaki gets 1323 mm of precipitation in an average year, spread over about 100 days with measurable rain. That is fewer rainy days than 76% of Japan.

October is the wettest month, with 186 mm. February is the driest, with 47 mm. July has the most rainy days, about 12.

The longest dry spell in the last five years lasted 29 days, to February 9, 2022.

Iwaki weather by month

Iwaki weather in January

In January, Iwaki averages a high of 9°C and a low of -1°C. It gets 50 mm of precipitation over about 5 rainy days. The sun is out about 57% of daylight hours. The January record high is 18°C (2010) and the record low is -8°C (1970).

Iwaki weather in February

In February, Iwaki averages a high of 9°C and a low of -1°C. It gets 47 mm of precipitation over about 5 rainy days. The sun is out about 55% of daylight hours. The February record high is 22°C (2024) and the record low is -8°C (1977).

Iwaki weather in March

In March, Iwaki averages a high of 12°C and a low of 2°C. It gets 94 mm of precipitation over about 8 rainy days. The sun is out about 44% of daylight hours. The March record high is 23°C (2007) and the record low is -7°C (1977).

Iwaki weather in April

In April, Iwaki averages a high of 16°C and a low of 7°C. It gets 113 mm of precipitation over about 9 rainy days. The sun is out about 42% of daylight hours. The April record high is 27°C (2004) and the record low is -2°C (1981).

Iwaki weather in May

In May, Iwaki averages a high of 20°C and a low of 12°C. It gets 136 mm of precipitation over about 10 rainy days. The sun is out about 32% of daylight hours. The May record high is 30°C (2026) and the record low is 3°C (1991). May is one of the most comfortable months to visit.

Iwaki weather in June

In June, Iwaki averages a high of 23°C and a low of 16°C. It gets 145 mm of precipitation over about 11 rainy days. The sun is out about 26% of daylight hours. The June record high is 33°C (2025) and the record low is 8°C (2010). June is one of the most comfortable months to visit.

Iwaki weather in July

In July, Iwaki averages a high of 26°C and a low of 20°C. It gets 142 mm of precipitation over about 12 rainy days. The sun is out about 25% of daylight hours. The July record high is 37°C (2024) and the record low is 9°C (1976). July is one of the most comfortable months to visit.

Iwaki weather in August

In August, Iwaki averages a high of 28°C and a low of 22°C. It gets 118 mm of precipitation over about 9 rainy days. The sun is out about 37% of daylight hours. The August record high is 38°C (1994) and the record low is 13°C (1980).

Iwaki weather in September

In September, Iwaki averages a high of 26°C and a low of 18°C. It gets 172 mm of precipitation over about 10 rainy days. The sun is out about 29% of daylight hours. The September record high is 34°C (1992) and the record low is 9°C (2001). September is one of the most comfortable months to visit.

Iwaki weather in October

In October, Iwaki averages a high of 21°C and a low of 12°C. It gets 186 mm of precipitation over about 9 rainy days. The sun is out about 40% of daylight hours. The October record high is 32°C (2018) and the record low is 2°C (1984).

Iwaki weather in November

In November, Iwaki averages a high of 16°C and a low of 6°C. It gets 73 mm of precipitation over about 7 rainy days. The sun is out about 57% of daylight hours. The November record high is 25°C (1977) and the record low is -3°C (1983).

Iwaki weather in December

In December, Iwaki averages a high of 11°C and a low of 2°C. It gets 47 mm of precipitation over about 5 rainy days. The sun is out about 62% of daylight hours. The December record high is 26°C (2004) and the record low is -6°C (1973).

Sunshine, humidity and wind in Iwaki

December is the sunniest month in Iwaki, with sunshine about 62% of daylight hours. July is the cloudiest, at 25%. Over the year the sun shines about 42% of daylight hours. Iwaki is sunnier than 83% of Japan.

Humidity peaks in July at 90% and is lowest in February at 62%.

Iwaki has about 3 days a year above 32°C. Iwaki is cooler than 88% of Japan.

First and last freeze in Iwaki

The first fall freeze in Iwaki typically comes around December 5, and the last spring freeze around March 27. That leaves a frost-free growing season of about 253 days.

Iwaki weather records

The hottest temperature on record at the Iwaki station is 38°C, on August 3, 1994. The coldest is -8°C, on January 30, 1985.

The wettest day on record brought 225 mm of rain, on August 31, 1971.

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

The best time to visit Iwaki

The most comfortable time to visit is typically May to July and September, when daytime highs sit near 24°C.

Winter (December–February) is chilly, with average highs around 10°C and lows near 0°C.

Spring (March–May) is mild, with average highs around 16°C and lows near 7°C.

Summer (June–August) is warm, with average highs around 26°C and lows near 19°C. It can feel humid.

Autumn (September–November) is warm, with average highs around 21°C and lows near 12°C.

Iwaki climate questions

How much rain does Iwaki get?

Iwaki gets 1323 mm of precipitation in an average year, over about 100 rainy days.

What is the wettest month in Iwaki?

October is the wettest month in Iwaki, with 186 mm. February is the driest, with 47 mm.

How many rainy days does Iwaki have a year?

Iwaki has about 100 days with measurable rain in an average year. July has the most, about 12.

What is the hottest month in Iwaki?

August is the warmest month in Iwaki, with an average high of 28°C.

What is the coldest month in Iwaki?

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

What is the record high temperature in Iwaki?

The record high at the Iwaki station is 38°C, set on August 3, 1994. The record low is -8°C, on January 30, 1985.

What is the sunniest month in Iwaki?

December is the sunniest month in Iwaki, with sunshine about 62% of daylight hours. July is the cloudiest.

When is the first frost in Iwaki?

The first fall freeze in Iwaki typically comes around December 5. The last spring freeze is around March 27.

What is the best time to visit Iwaki?

The most comfortable time to visit is typically May to July and September, when daytime highs sit near 24°C.