Okayama, Okayama Weather by Month and Climate Averages

How much rain does Okayama get?

Okayama gets 1033 mm of precipitation in an average year, spread over about 89 days with measurable rain. That is fewer rainy days than 93% of Japan.

June is the wettest month, with 159 mm. January is the driest, with 31 mm. June has the most rainy days, about 11.

The longest dry spell in the last five years lasted 24 days, to October 12, 2021.

Okayama weather by month

Okayama weather in January

In January, Okayama averages a high of 9°C and a low of 1°C. It gets 31 mm of precipitation over about 5 rainy days. The sun is out about 48% of daylight hours. The January record high is 17°C (2016) and the record low is -7°C (1974).

Okayama weather in February

In February, Okayama averages a high of 11°C and a low of 1°C. It gets 44 mm of precipitation over about 7 rainy days. The sun is out about 46% of daylight hours. The February record high is 22°C (2010) and the record low is -9°C (1977).

Okayama weather in March

In March, Okayama averages a high of 14°C and a low of 3°C. It gets 72 mm of precipitation over about 8 rainy days. The sun is out about 43% of daylight hours. The March record high is 26°C (2025) and the record low is -7°C (1977).

Okayama weather in April

In April, Okayama averages a high of 20°C and a low of 9°C. It gets 78 mm of precipitation over about 8 rainy days. The sun is out about 41% of daylight hours. The April record high is 29°C (2004) and the record low is -2°C (1975). April is one of the most comfortable months to visit.

Okayama weather in May

In May, Okayama averages a high of 25°C and a low of 14°C. It gets 107 mm of precipitation over about 8 rainy days. The sun is out about 35% of daylight hours. The May record high is 33°C (2015) and the record low is 2°C (1980). May is one of the most comfortable months to visit.

Okayama weather in June

In June, Okayama averages a high of 28°C and a low of 19°C. It gets 159 mm of precipitation over about 11 rainy days. The sun is out about 26% of daylight hours. The June record high is 37°C (2013) and the record low is 8°C (1978).

Okayama weather in July

In July, Okayama averages a high of 32°C and a low of 24°C. It gets 159 mm of precipitation over about 10 rainy days. The sun is out about 28% of daylight hours. The July record high is 38°C (2018) and the record low is 15°C (1982).

Okayama weather in August

In August, Okayama averages a high of 33°C and a low of 24°C. It gets 79 mm of precipitation over about 6 rainy days. The sun is out about 40% of daylight hours. The August record high is 39°C (2025) and the record low is 16°C (1972).

Okayama weather in September

In September, Okayama averages a high of 29°C and a low of 21°C. It gets 127 mm of precipitation over about 9 rainy days. The sun is out about 38% of daylight hours. The September record high is 37°C (2020) and the record low is 9°C (1972).

Okayama weather in October

In October, Okayama averages a high of 23°C and a low of 14°C. It gets 85 mm of precipitation over about 7 rainy days. The sun is out about 49% of daylight hours. The October record high is 33°C (2018) and the record low is 2°C (1970). October is one of the most comfortable months to visit.

Okayama weather in November

In November, Okayama averages a high of 17°C and a low of 8°C. It gets 51 mm of precipitation over about 6 rainy days. The sun is out about 56% of daylight hours. The November record high is 27°C (1977) and the record low is -2°C (1973). November is one of the most comfortable months to visit.

Okayama weather in December

In December, Okayama averages a high of 12°C and a low of 3°C. It gets 40 mm of precipitation over about 6 rainy days. The sun is out about 56% of daylight hours. The December record high is 21°C (2018) and the record low is -6°C (1976).

Sunshine, humidity and wind in Okayama

November is the sunniest month in Okayama, with sunshine about 56% of daylight hours. June is the cloudiest, at 26%. Over the year the sun shines about 42% of daylight hours. Okayama is sunnier than 83% of Japan.

Humidity peaks in July at 78% and is lowest in April at 62%.

Okayama has about 37 days a year above 32°C. Okayama is hotter than 92% of Japan.

First and last freeze in Okayama

The first fall freeze in Okayama typically comes around December 12, and the last spring freeze around March 15. That leaves a frost-free growing season of about 272 days.

Okayama weather records

The hottest temperature on record at the Okayama station is 39°C, on August 5, 2025. The coldest is -9°C, on February 27, 1981.

The wettest day on record brought 197 mm of rain, on July 7, 2018.

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

The best time to visit Okayama

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 23°C. It can feel humid.

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

Okayama climate questions

How much rain does Okayama get?

Okayama gets 1033 mm of precipitation in an average year, over about 89 rainy days.

What is the wettest month in Okayama?

June is the wettest month in Okayama, with 159 mm. January is the driest, with 31 mm.

How many rainy days does Okayama have a year?

Okayama has about 89 days with measurable rain in an average year. June has the most, about 11.

What is the hottest month in Okayama?

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

What is the coldest month in Okayama?

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

What is the record high temperature in Okayama?

The record high at the Okayama station is 39°C, set on August 5, 2025. The record low is -9°C, on February 27, 1981.

What is the sunniest month in Okayama?

November is the sunniest month in Okayama, with sunshine about 56% of daylight hours. June is the cloudiest.

When is the first frost in Okayama?

The first fall freeze in Okayama typically comes around December 12. The last spring freeze is around March 15.

What is the best time to visit Okayama?

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