The short answer
If you would like the headline before the detail, here it is: the two best times to visit South Korea are spring and autumn. Both bring mild temperatures, clear skies and the country at its most beautiful.
Spring, roughly late March through May, is cherry blossom season, when avenues, palace grounds and riverbanks turn soft pink and white for a fleeting, magical week or two. Autumn, roughly October into November, brings the maples and ginkgos into fiery reds, oranges and golds, and many seasoned travellers consider it the very finest time of all to visit.
These are the seasons we have built our South Korea tours around, including a dedicated Cherry Blossom & Autumn Foliage tour designed to place you in the right region at the right moment. Summer and winter each have their charms, but for sheer comfort and beauty, spring and autumn are the ones to plan around.
Spring and the cherry blossom
Spring is, for many, the quintessential image of Korea: temple courtyards framed by blossom, palace walls in Seoul softened by clouds of pink, and the gentle drift of petals along the Han River. From late March into May the weather warms pleasantly, the worst of the winter chill lifts, and the whole country seems to exhale.
The blossom itself is forecast-led and moves steadily south-to-north, so timing takes a little care. The warmer southern regions bloom first, with Jeju Island and the city of Busan typically colouring in late March, while Seoul and the central regions usually follow in early to mid April. Each year is slightly different, and a warm spell or a cold snap can shift the dates by a week or more in either direction.
This is precisely why we plan our spring itineraries to follow the bloom, beginning where the blossom arrives earliest and travelling onward as it spreads northward. It is worth saying plainly, however, that nature keeps her own diary: blossom dates can never be guaranteed, and part of the joy is in the gentle anticipation. Even a few days either side of the peak, the spring landscape is a delight.
Autumn foliage, often the very best
If spring is romantic, autumn is positively spectacular, and a great many returning visitors tell us it is their favourite season of all. Through October and into November the hillsides, national parks and temple grounds turn through every shade of amber, copper, crimson and gold, set against the clearest skies of the year.
The autumn colour moves in the opposite direction to the blossom, turning north-to-south as the cooler weather creeps down the peninsula. The mountainous north and the higher ground colour first, with the display gradually working its way south through the season, so there is a generous window in which to catch the foliage at its best somewhere in the country.
The air in autumn is crisp and dry, the daytime temperatures are comfortable for walking, and the light has a lovely golden quality that flatters every photograph. It is no surprise that our Cherry Blossom & Autumn Foliage tour draws so many travellers back for a second visit in the opposite season. As with the spring blossom, the precise peak cannot be promised in advance, but the broad October-to-November window rarely disappoints.
Summer: hot, humid and the monsoon
Summer, from June through August, is the season we would approach with the most caution, though it is far from impossible. The heat builds steadily, and by July and August Seoul averages a sticky 26 to 27 degrees, with high humidity that can make sightseeing feel more tiring than the thermometer alone suggests.
Summer also brings the monsoon, known locally as jangma, a rainy spell that typically settles in around late June and July. Days can be overcast and wet, with heavy downpours that occasionally disrupt outdoor plans. The countryside is lush and green, and the cities carry on regardless, but the combination of heat, humidity and rain makes for less comfortable travelling than the gentler shoulder seasons.
If summer is the only window that suits you, it is perfectly manageable with a relaxed pace, plenty of rest, and air-conditioned comfort never far away. But if you have the flexibility to choose, we would gently nudge you towards spring or autumn instead.
Winter: cold, crisp and quiet
Korean winters, from December through February, are properly cold and notably dry, with temperatures in Seoul hovering around freezing and dipping below it in the depths of January. The skies are often a brilliant clear blue, and snow makes regular appearances, dusting palace rooftops and mountain temples in a way that is undeniably beautiful.
This is the quietest season for visitors, so attractions feel uncrowded and unhurried, and there is a particular romance to a snow-covered Korea. For those who enjoy cold-weather travel and come well wrapped against the chill, winter has a serene charm all of its own.
That said, the cold can be biting, pavements may be icy underfoot, and the short daylight hours leave less time for unhurried sightseeing. For most of our travellers, winter is best regarded as a specialist choice rather than a first visit.
Month by month at a glance
Here is the year in brief, using average Seoul temperatures and a sense of how busy each month tends to be, to help you weigh comfort against crowds.
January, around minus 2 degrees, cold, dry and quiet. February, around 1 degree, still cold but quiet. March, around 7 degrees, a pleasant shoulder month as spring begins and the first southern blossom appears.
April, around 14 degrees, peak season and prime cherry blossom in the central regions. May, around 19 degrees, peak season, warm, green and very pleasant. June, around 23 degrees, a warm shoulder month before the monsoon settles in.
July, around 26 degrees, hot and humid with monsoon rain, and quieter as a result. August, around 27 degrees, the hottest month, humid and quieter. September, around 22 degrees, a comfortable shoulder month as the heat eases.
October, around 16 degrees, peak season and glorious autumn foliage. November, around 8 degrees, a crisp shoulder month with the last of the colour in the south. December, around 1 degree, cold, dry and quiet as winter returns.
What this means for the over-60s
For comfort, the mild shoulder and peak months of spring and autumn are far and away the kindest on the body. April, May, September and October offer warm but rarely oppressive days, dry skies and the gentle light that makes for easy, pleasant walking, exactly the conditions you want when you are out exploring palaces, gardens and temple grounds at an unhurried pace.
A word on layering: even in the loveliest weeks, Korean mornings and evenings can feel decidedly cool while the middle of the day is warm, so a few light layers you can add and remove make all the difference. We would suggest comfortable, well-cushioned walking shoes, a light waterproof for the occasional shower, a warm layer for cooler mornings, and a hat for the bright spring and autumn sun. In winter, of course, pack properly for the cold.
One of the quiet joys of travelling in Korea is the superb KTX high-speed rail network, which lets us cover long distances between cities swiftly, smoothly and in great comfort, sparing you long road transfers and leaving more energy for the days themselves. Our South Korea tours are paced gently with rest built in, and our Cherry Blossom & Autumn Foliage tour in particular is designed to place you in the right region at the right moment. We will always be honest that blossom and foliage dates follow nature's own timetable and cannot be guaranteed, but with careful planning and a little flexibility, the rewards are considerable.