Jeju Island Weather by Month — Temperature & Rainfall Guide

Jeju Island is a region in South Korea. Many people wonder what the weather conditions are in Jeju Island over the year. What is the best time to visit Jeju Island?

This page shows the average weather conditions by month in Jeju Island over the year in: January, February, March, April, May, June, July, August, September, October, November, December.

In January the weather in Jeju Island is generally less favorable. January is a winter month. In Jeju you can expect cold maximum average daytime temperatures around 9°C (48°F) and nighttime temperatures around 5°C (41°F). On average, this month is the coldest month of the year in Jeju Island.

Find more detailed climate information for Jeju Island in January here.

In February the weather in Jeju Island is generally less favorable. February is a winter month. In Jeju you can expect cold maximum average daytime temperatures around 10°C (50°F) and nighttime temperatures around 5°C (41°F).

Find more detailed climate information for Jeju Island in February here.

In March the weather in Jeju Island is generally mixed. In Jeju you can expect mild maximum average daytime temperatures around 13°C (55°F) and nighttime temperatures around 7°C (45°F).

Find more detailed climate information for Jeju Island in March here.

In April the weather in Jeju Island ranges from mixed in Jeju to good in Seogwipo. In Jeju you can expect mild maximum average daytime temperatures around 16°C (61°F) and nighttime temperatures around 11°C (52°F).

Find more detailed climate information for Jeju Island in April here.

In May the weather in Jeju Island is generally very good. The temperatures range from pleasant in Jeju with 20°C (68°F) to high in Seogwipo with 22°C (72°F).

Find more detailed climate information for Jeju Island in May here.

In June the weather in Jeju Island is generally mixed. In Jeju you can expect warm maximum average daytime temperatures around 23°C (73°F) and nighttime temperatures around 19°C (66°F).

Find more detailed climate information for Jeju Island in June here.

In July the weather in Jeju Island ranges from mixed in Seogwipo to good in Jeju. July is a summer month. In Jeju you can expect warm maximum average daytime temperatures around 28°C (82°F) and nighttime temperatures around 24°C (75°F).

Find more detailed climate information for Jeju Island in July here.

In August the weather in Jeju Island ranges from less favorable in Seogwipo to very good in Jeju. August is a summer month. In Jeju you can expect warm maximum average daytime temperatures around 29°C (84°F) and nighttime temperatures around 25°C (77°F). On average, this month is one of the warmest months of the year in Jeju Island. So be prepared and make sure to dress lightly.

Find more detailed climate information for Jeju Island in August here.

In September the weather in Jeju Island ranges from mixed in Seogwipo to very good in Jeju. September is a summer month. In Jeju you can expect warm maximum average daytime temperatures around 26°C (79°F) and nighttime temperatures around 22°C (72°F).

Find more detailed climate information for Jeju Island in September here.

In October the weather in Jeju Island is generally excellent. In Jeju you can expect pleasant maximum average daytime temperatures around 21°C (70°F) and nighttime temperatures around 17°C (63°F).

Find more detailed climate information for Jeju Island in October here.

In November the weather in Jeju Island is generally good. In Jeju you can expect mild maximum average daytime temperatures around 17°C (63°F) and nighttime temperatures around 12°C (54°F).

Find more detailed climate information for Jeju Island in November here.

In December the weather in Jeju Island is generally mixed. December is a winter month. In Jeju you can expect cold maximum average daytime temperatures around 12°C (54°F) and nighttime temperatures around 7°C (45°F).

Find more detailed climate information for Jeju Island in December here.