Best and Worst Months to Visit Jeju City: Weather and Seasonal Guide

Quick Weather Answer: Best and Worst Time to Visit Jeju City

The best time to visit Jeju City for weather is usually October, when average daytime temperatures are around 69F (20C) and nights are near 65F (18C). The worst time to visit Jeju City is usually August, because the weather is less comfortable for long walks, outdoor sightseeing, and casual transit-heavy days.

• Best month for weather: October
• Worst month for weather: August
• Most comfortable season: Fall
• Hottest month: August, with average highs near 82F (28C)
• Coldest month: January, with average lows near 43F (6C)
• Rainiest month: August, with about 10.2 inches of rain
• Driest month: December, with about 2.0 inches of precipitation
• Most unpredictable weather period: the summer rainy period
• Best weather for a first-time trip: April, October, and November

What Is the Weather Like in Jeju City?

Jeju City has a climate with meaningful month-to-month changes. Summers can be warm or hot, winters are cooler, and spring and fall often decide whether a trip feels smooth or weather-complicated. The Jeju City climate by month shows average highs from about 48F (9C) in the coolest part of the year to about 82F (28C) in the hottest part. Annual precipitation averages roughly 61.6 inches.

Weather in Jeju City changes the feel of the city because this is a place where comfort depends on more than the number on a forecast. A mild month can make metro transfers, neighborhood walks, outdoor meals, and photography feel easy. A difficult month can make the same itinerary feel slower, sweatier, colder, wetter, or more dependent on indoor breaks.

Best Month to Visit Jeju City for Weather

October is the best month to visit Jeju City for weather in a typical year. Average daytime highs are near 69F (20C), while nights are around 65F (18C). Precipitation averages 3.1 inches, so the month is usually more comfortable than the wetter, hotter, or colder parts of the year.

What makes October stand out is balance. It is not necessarily perfect every day, but it usually gives travelers the best combination of outdoor comfort, manageable weather risk, and enough flexibility for a first-time trip. If hotel prices or crowds rise during this period, that popularity is at least partly weather-driven.

Worst Month to Visit Jeju City for Weather

August is the worst month to visit Jeju City from a pure weather perspective. Average highs are around 82F (28C), and nights are near 79F (26C). The month also brings heavy rain, averaging about 10.2 inches, which can make long outdoor days less comfortable.

Rain is the main problem. The month is not impossible, but showers and damp conditions can interrupt outdoor plans and make transit transfers less pleasant. Lower hotel prices or fewer visitors can make August acceptable for flexible travelers, but it is not the month I would choose for the best weather in Jeju City.

Jeju City Weather by Season

Spring Weather in Jeju City

In Jeju City, spring usually means March, April, and May. Daytime highs typically run from 53F (12C) to 64F (18C), with nights from about 47F (8C) to 60F (15C). Across the season, precipitation averages around 14.2 inches. Rain and humidity shape the season, so outdoor plans need more flexibility than the temperature alone suggests. The best spring month for weather is usually April, while May is the least comfortable part of the season.

Summer Weather in Jeju City

In Jeju City, summer usually means June, July, and August. Daytime highs typically run from 71F (22C) to 82F (28C), with nights from about 67F (20C) to 79F (26C). Across the season, precipitation averages around 27.8 inches. Rain and humidity shape the season, so outdoor plans need more flexibility than the temperature alone suggests. The best summer month for weather is usually June, while August is the least comfortable part of the season.

Fall Weather in Jeju City

In Jeju City, fall usually means September, October, and November. Daytime highs typically run from 60F (16C) to 76F (25C), with nights from about 56F (13C) to 73F (23C). Across the season, precipitation averages around 13.3 inches. Rain and humidity shape the season, so outdoor plans need more flexibility than the temperature alone suggests. The best fall month for weather is usually October, while September is the least comfortable part of the season.

Winter Weather in Jeju City

In Jeju City, winter usually means December, January, and February. Daytime highs typically run from 48F (9C) to 52F (11C), with nights from about 43F (6C) to 47F (8C). Across the season, precipitation averages around 6.4 inches. This is one of the more comfortable stretches of the year for walking, transit transfers, outdoor meals, and photography. The best winter month for weather is usually December, while January is the least comfortable part of the season.

Jeju City Weather by Month: What to Expect

January in Jeju City

January in Jeju City typically brings daytime highs around 48F (9C) and nighttime lows near 43F (6C). Expect some rain, averaging about 2.1 inches, and average winds near 15 mph. In real life, the weather is manageable but not effortless, especially if wind, gray skies, or quick temperature changes show up.

Outdoor comfort is very comfortable for most travelers. Pack a warm jacket, layers. Verdict: January is a good month for weather in Jeju City.

February in Jeju City

February in Jeju City typically brings daytime highs around 49F (9C) and nighttime lows near 44F (6C). Expect some rain, averaging about 2.3 inches, and average winds near 14 mph. In real life, the weather is manageable but not effortless, especially if wind, gray skies, or quick temperature changes show up.

Outdoor comfort is very comfortable for most travelers. Pack a warm jacket, layers. Verdict: February is a good month for weather in Jeju City.

March in Jeju City

March in Jeju City typically brings daytime highs around 53F (12C) and nighttime lows near 47F (8C). Expect moderate rain, averaging about 3.9 inches, and average winds near 13 mph. In real life, the weather is manageable but not effortless, especially if wind, gray skies, or quick temperature changes show up.

Outdoor comfort is very comfortable for most travelers. Pack a warm jacket, layers, a compact umbrella or rain shell. Verdict: March is a good month for weather in Jeju City.

April in Jeju City

April in Jeju City typically brings daytime highs around 58F (15C) and nighttime lows near 53F (12C). Expect moderate rain, averaging about 5.0 inches, and average winds near 11 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is very comfortable for most travelers. Pack comfortable layers, a light jacket, a compact umbrella or rain shell. Verdict: April is a good month for weather in Jeju City.

May in Jeju City

May in Jeju City typically brings daytime highs around 64F (18C) and nighttime lows near 60F (15C). Expect moderate rain, averaging about 5.3 inches, and average winds near 9 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is very comfortable for most travelers. Pack comfortable layers, a light jacket, a compact umbrella or rain shell. Verdict: May is a good month for weather in Jeju City.

June in Jeju City

June in Jeju City typically brings daytime highs around 71F (22C) and nighttime lows near 67F (20C). Expect heavy rain, averaging about 7.8 inches, and average winds near 8 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is rainy and less reliable for most travelers. Pack comfortable layers, a light jacket, a compact umbrella or rain shell. Verdict: June is possible, but it is not one of the easier weather months in Jeju City.

July in Jeju City

July in Jeju City typically brings daytime highs around 78F (26C) and nighttime lows near 75F (24C). Expect heavy rain, averaging about 9.9 inches, and average winds near 9 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is rainy and less reliable for most travelers. Pack light clothing, sunglasses, a light layer for evenings, a compact umbrella or rain shell. Verdict: July is possible, but it is not one of the easier weather months in Jeju City.

August in Jeju City

August in Jeju City typically brings daytime highs around 82F (28C) and nighttime lows near 79F (26C). Expect heavy rain, averaging about 10.2 inches, and average winds near 10 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is one of the least comfortable periods of the year for most travelers. Pack light clothing, sunglasses, a light layer for evenings, a compact umbrella or rain shell. Verdict: August is the weakest weather month in Jeju City, even if prepared travelers can still make it work.

September in Jeju City

September in Jeju City typically brings daytime highs around 76F (25C) and nighttime lows near 73F (23C). Expect heavy rain, averaging about 7.3 inches, and average winds near 11 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is rainy and less reliable for most travelers. Pack light clothing, sunglasses, a light layer for evenings, a compact umbrella or rain shell. Verdict: September is possible, but it is not one of the easier weather months in Jeju City.

October in Jeju City

October in Jeju City typically brings daytime highs around 69F (20C) and nighttime lows near 65F (18C). Expect moderate rain, averaging about 3.1 inches, and average winds near 12 mph. In real life, this is one of the easier kinds of city weather, with comfortable walking conditions and only limited weather friction.

Outdoor comfort is the best of the year for most travelers. Pack comfortable layers, a light jacket, a compact umbrella or rain shell. Verdict: October is one of the best weather months in Jeju City.

November in Jeju City

November in Jeju City typically brings daytime highs around 60F (16C) and nighttime lows near 56F (13C). Expect some rain, averaging about 2.9 inches, and average winds near 12 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is very comfortable for most travelers. Pack comfortable layers, a light jacket. Verdict: November is a good month for weather in Jeju City.

December in Jeju City

December in Jeju City typically brings daytime highs around 52F (11C) and nighttime lows near 47F (8C). Expect some rain, averaging about 2.0 inches, and average winds near 14 mph. In real life, the weather is manageable but not effortless, especially if wind, gray skies, or quick temperature changes show up.

Outdoor comfort is very comfortable for most travelers. Pack a warm jacket, layers. Verdict: December is a good month for weather in Jeju City.

Month-by-Month Weather Table for Jeju City

Hottest Time of Year in Jeju City

The hottest time of year in Jeju City is usually August. The hottest month in Jeju City is August, with average highs near 82F (28C) and nights around 79F (26C). If humidity or strong sun is present, the heat can feel more demanding than the average high suggests.

Early mornings and evenings are usually better than midafternoon during this period. If the hot months overlap with summer vacation or peak travel, the city may still be busy, but from a weather perspective this is not automatically the most comfortable time to visit.

Coldest Time of Year in Jeju City

The coldest time of year in Jeju City is usually January and February. The coldest month in Jeju City is January, with average lows near 43F (6C) and daytime highs around 48F (9C). Snow is not the main issue, but cool mornings, wind, rain, or shorter daylight can still affect comfort.

Rainiest, Snowiest, or Most Humid Months in Jeju City

The rainiest month is usually August, with about 10.2 inches of rain. This is the month when showers, humidity, storms, or wet pavement are most likely to shape the trip. It can still be possible, but it is less reliable for outdoor-heavy plans.

Driest and Clearest Months in Jeju City

The driest month in Jeju City is usually December, with about 2.0 inches of precipitation. The broader dry-weather window often includes January, February, and December. These months are generally better for walking, photos, outdoor meals, and day trips because the odds of weather interruptions are lower.

Most Unpredictable Weather Period in Jeju City

The most unpredictable weather period in Jeju City is usually the summer rainy period. During this stretch, travelers should expect the forecast to matter more than the calendar. Pack flexible layers, check conditions before long walks, and avoid building a trip around only one kind of weather.

Best Weather for First-Time Visitors

For a first-time trip, the best weather window is usually April, October, and November. This period gives the strongest balance of mild temperatures, manageable rain, outdoor comfort, and enough daylight for a relaxed city schedule. It is also the period most likely to answer the question of when is the weather best in Jeju City without asking travelers to tolerate the year’s worst heat, cold, or wet weather.

When to Avoid Jeju City Because of Weather

Consider avoiding June, July, August, September if your trip depends on comfortable walking weather. These months are more likely to be too hot, too cold, too wet, too snowy, or simply less pleasant than the better parts of the year.

Families with kids, older travelers, photographers, and visitors who want to walk a lot should be especially careful with the worst weather months. Travelers who dislike heat should avoid the hottest stretch around August; travelers who dislike cold should avoid the coldest stretch around January and February; travelers who dislike rain should be cautious around August.

Final Weather Verdict: When Should You Visit Jeju City?

The best month to visit Jeju City for weather is October. The worst month to visit Jeju City is August. The best season overall is usually Fall, while the best mild-weather period for a first-time visitor is April, October, and November.

If you want the best month to visit Jeju City, choose the month that gives you comfortable daytime temperatures and the lowest risk of weather disrupting outdoor plans. If you are comparing Jeju City weather by month, do not look only at the hottest month in Jeju City or the coldest month in Jeju City. Rain, snow, wind, humidity, and daylight can matter just as much.

For most travelers, the practical answer is simple: visit during the comfortable middle of the Jeju City seasons, avoid the most extreme month if you can, and pack for the specific weather pattern of your chosen dates.