Best and Worst Months to Visit Ulsan: Weather and Seasonal Guide

Quick Weather Answer: Best and Worst Time to Visit Ulsan

The best time to visit Ulsan for weather is usually October, when average daytime temperatures are around 68F (20C) and nights are near 59F (15C). The worst time to visit Ulsan 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 32F (0C)
• Rainiest month: July, with about 8.8 inches of rain
• Driest month: December, with about 1.5 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 Ulsan?

Ulsan 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 Ulsan climate by month shows average highs from about 42F (6C) in the coolest part of the year to about 82F (28C) in the hottest part. Annual precipitation averages roughly 51.5 inches.

Weather in Ulsan 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 Ulsan for Weather

October is the best month to visit Ulsan for weather in a typical year. Average daytime highs are near 68F (20C), while nights are around 59F (15C). Precipitation averages 2.8 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 Ulsan for Weather

August is the worst month to visit Ulsan from a pure weather perspective. Average highs are around 82F (28C), and nights are near 75F (24C). The month also brings heavy rain, averaging about 8.0 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 Ulsan.

Ulsan Weather by Season

Spring Weather in Ulsan

In Ulsan, spring usually means March, April, and May. Daytime highs typically run from 53F (12C) to 69F (20C), with nights from about 41F (5C) to 57F (14C). Across the season, precipitation averages around 11.8 inches. This is one of the more comfortable stretches of the year for walking, transit transfers, outdoor meals, and photography. The best spring month for weather is usually April, while March is the least comfortable part of the season.

Summer Weather in Ulsan

In Ulsan, summer usually means June, July, and August. Daytime highs typically run from 74F (23C) to 82F (28C), with nights from about 65F (18C) to 75F (24C). Across the season, precipitation averages around 23.2 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 Ulsan

In Ulsan, fall usually means September, October, and November. Daytime highs typically run from 58F (14C) to 76F (24C), with nights from about 47F (8C) to 69F (20C). Across the season, precipitation averages around 11.5 inches. This is one of the more comfortable stretches of the year for walking, transit transfers, outdoor meals, and photography. The best fall month for weather is usually October, while September is the least comfortable part of the season.

Winter Weather in Ulsan

In Ulsan, winter usually means December, January, and February. Daytime highs typically run from 42F (6C) to 46F (8C), with nights from about 32F (0C) to 36F (2C). Across the season, precipitation averages around 5.0 inches, with snow or icy conditions possible. 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.

Ulsan Weather by Month: What to Expect

January in Ulsan

January in Ulsan typically brings daytime highs around 42F (6C) and nighttime lows near 32F (0C). Expect about 1.7 inches of precipitation and occasional snow or icy weather, and average winds near 12 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 good, with a few weather tradeoffs for most travelers. Pack a warm jacket, layers. Verdict: January is a good month for weather in Ulsan.

February in Ulsan

February in Ulsan typically brings daytime highs around 46F (8C) and nighttime lows near 35F (2C). Expect some rain, averaging about 1.9 inches, and average winds near 11 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 good, with a few weather tradeoffs for most travelers. Pack a warm jacket, layers. Verdict: February is a good month for weather in Ulsan.

March in Ulsan

March in Ulsan typically brings daytime highs around 53F (12C) and nighttime lows near 41F (5C). Expect moderate rain, averaging about 3.0 inches, and average winds near 11 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 Ulsan.

April in Ulsan

April in Ulsan typically brings daytime highs around 61F (16C) and nighttime lows near 49F (9C). Expect moderate rain, averaging about 4.1 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 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 Ulsan.

May in Ulsan

May in Ulsan typically brings daytime highs around 69F (20C) and nighttime lows near 57F (14C). Expect moderate rain, averaging about 4.7 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 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 Ulsan.

June in Ulsan

June in Ulsan typically brings daytime highs around 74F (23C) and nighttime lows near 65F (18C). Expect heavy rain, averaging about 6.4 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 Ulsan.

July in Ulsan

July in Ulsan typically brings daytime highs around 80F (26C) and nighttime lows near 72F (22C). Expect heavy rain, averaging about 8.8 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 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 Ulsan.

August in Ulsan

August in Ulsan typically brings daytime highs around 82F (28C) and nighttime lows near 75F (24C). Expect heavy rain, averaging about 8.0 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 still workable, but less reliable than the better months 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 Ulsan, even if prepared travelers can still make it work.

September in Ulsan

September in Ulsan typically brings daytime highs around 76F (24C) and nighttime lows near 69F (20C). Expect heavy rain, averaging about 6.4 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 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 Ulsan.

October in Ulsan

October in Ulsan typically brings daytime highs around 68F (20C) and nighttime lows near 59F (15C). Expect some rain, averaging about 2.8 inches, and average winds near 10 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. Verdict: October is one of the best weather months in Ulsan.

November in Ulsan

November in Ulsan typically brings daytime highs around 58F (14C) and nighttime lows near 47F (8C). Expect some rain, averaging about 2.2 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 very comfortable for most travelers. Pack comfortable layers, a light jacket. Verdict: November is a good month for weather in Ulsan.

December in Ulsan

December in Ulsan typically brings daytime highs around 46F (8C) and nighttime lows near 36F (2C). Expect about 1.5 inches of precipitation and occasional snow or icy weather, and average winds near 12 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 good, with a few weather tradeoffs for most travelers. Pack a warm jacket, layers. Verdict: December is a good month for weather in Ulsan.

Month-by-Month Weather Table for Ulsan

Hottest Time of Year in Ulsan

The hottest time of year in Ulsan is usually August. The hottest month in Ulsan is August, with average highs near 82F (28C) and nights around 75F (24C). 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 Ulsan

The coldest time of year in Ulsan is usually January and February. The coldest month in Ulsan is January, with average lows near 32F (0C) and daytime highs around 42F (6C). 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 Ulsan

The rainiest month is usually July, with about 8.8 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 Ulsan

The driest month in Ulsan is usually December, with about 1.5 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 Ulsan

The most unpredictable weather period in Ulsan 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 Ulsan without asking travelers to tolerate the year’s worst heat, cold, or wet weather.

When to Avoid Ulsan Because of Weather

Consider avoiding July, August 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 July.

Final Weather Verdict: When Should You Visit Ulsan?

The best month to visit Ulsan for weather is October. The worst month to visit Ulsan 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 Ulsan, choose the month that gives you comfortable daytime temperatures and the lowest risk of weather disrupting outdoor plans. If you are comparing Ulsan weather by month, do not look only at the hottest month in Ulsan or the coldest month in Ulsan. 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 Ulsan seasons, avoid the most extreme month if you can, and pack for the specific weather pattern of your chosen dates.