Compare the climate averages
These are 1991–2020 climate averages, not a forecast for your visit. The daily high and low columns average many days over that period; they are not limits on how hot or cold a particular day can become. Precipitation is the average monthly total.
| City | Monthly mean (°C) | Average daily high (°C) | Average daily low (°C) | Average high–low difference (°C) | Monthly precipitation (mm) | Relative humidity |
|---|---|---|---|---|---|---|
| Busan (부산) | 13.8 | 18.2 | 10.1 | 8.1° | 140.9 | 61.1% |
| Daegu (대구) | 14.5 | 20.6 | 8.8 | 11.8° | Not available in this dataset | Not available in this dataset |
| Gangneung (강릉) | 13.1 | 17.9 | 8.2 | 9.7° | 81.9 | 52.2% |
| Gyeongju (경주) | 12.7 | 19.7 | 6.0 | 13.7° | 96.1 | 60.3% |
| Incheon (인천) | 11.5 | 16.2 | 7.9 | 8.3° | 63.5 | 64.5% |
| Jeju (제주) | 14.2 | 18.0 | 10.8 | 7.2° | 89.7 | 64.8% |
| Seoul (서울) | 12.6 | 17.9 | 8.0 | 9.9° | 72.9 | 54.8% |
| Sokcho (속초) | 11.9 | 16.5 | 7.3 | 9.2° | 73.3 | 60.5% |
Source: Korea Meteorological Administration, 1991–2020 climate normals. A missing value means it is unavailable in the dataset used here, not that the city has no rain or that no other climate record exists. The selected table does not cover every Korean city.
Plan for mild days and cooler evenings
April is generally warmer than March, but a sunny afternoon can still give way to a cool evening. Inland places such as Gyeongju and Daegu often have a larger difference between average daytime highs and nighttime lows than the coast.
Bring layers and check the forecast for each destination. Rain can affect a walking day, and a monthly average does not establish whether it will arrive as light showers or a heavier event during your trip.
Keep cherry-blossom plans flexible
Cherry blossoms usually develop earlier in southern areas and later farther north, but local weather, elevation and tree variety all matter. First bloom, full bloom and the end of flowering are different stages.
Peak flowers can be brief, and wind or rain may shorten the display. Use the Korea Meteorological Administration's seasonal observations and current local reports when available. A forecast released before the season remains an estimate.
Do not assume that an early season in the previous year means you should automatically move this year's trip earlier. A south-to-north route offers more possibilities, but it does not guarantee that you will encounter peak flowers.
Check festival dates separately
Jinhae Gunhangje in Changwon, the Yeouido spring flower festival in Seoul and events around Seokchon Lake are well-known blossom outings. Their dates, road restrictions and programmes are announced for each edition.
A festival can begin before peak bloom or continue after petals have fallen. If flowers are your main reason for travelling, check both the event notice and the trees' current condition.
Popular weekends can be crowded. Plan the journey home, allow time for walking and do not block paths while taking photographs.
Monitor spring air quality
Fine-particle pollution and Asian dust can affect April. Conditions change from day to day and do not follow a reliable rule that mornings or a particular week will always be better.
Check Air Korea and local alerts. Follow the advice for your health needs and move strenuous outdoor activities when conditions warrant it. Keep an indoor option that does not depend on the flowers being at their best.
Pack for a walking-focused trip
Comfortable shoes, a light rain layer and a jacket make it easier to stay outdoors through changing conditions. Bring sun protection for long daytime walks.
Check the actual forecast before leaving each morning. Spring clothing suitable for a sheltered city street may be insufficient for an exposed coast or mountain trail.
