Seoul weather by month & the best time to visit
🇰🇷 South Korea · major coastal city · humid subtropical climate
The best time to visit Seoul is June — its sunniest month (Sunshine Score 72/100), with October and September close behind. Seoul averages about 2,037 hours of sunshine a year. Daytime highs around 21°C / 70°F and roughly 103 mm of rain in June.
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- Sun hours / year
- 2,037
- Sunniest month
- June
- Peak score
- 72/100
- Rain / year
- 1,174 mm
- Snow / year
- ≈14 cm
- Midday UV at peak
- 6 (high)
- Sea at warmest
- 30°C / 86°F
- Population
- 10.3M
- Elevation
- 5 m
When is the best time to visit Seoul?
For sunshine, the best time to visit Seoul is June, then October and September. The dullest month is January (0/100, 22 mm of rain). The full month-by-month picture is in the table below.
How sunny is Seoul?
Seoul gets a moderate 2,037 hours of sunshine a year. 72 Sunshine Score points separate June (72) from January (0), so the month you pick matters. It ranks #4 of 14 destinations in South Korea for annual sunshine, above the national median of 1,959 hours. Rain has a clear season: the wettest stretch, around August, carries about 59% of the annual 1,174 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | 1° / 34°F | -2° / 28°F | 22 mm | 2 | 2° / 36°F |
| February | 0 | 3° / 37°F | -1° / 30°F | 32 mm | 2 | 2° / 36°F |
| March | 0 | 6° / 43°F | 2° / 36°F | 36 mm | 3 | 5° / 41°F |
| April | 26 | 12° / 54°F | 7° / 45°F | 69 mm | 5 | 12° / 54°F |
| May | 56 | 17° / 63°F | 12° / 54°F | 86 mm | 6 | 17° / 63°F |
| June | 72 | 21° / 70°F | 18° / 64°F | 103 mm | 5 | 23° / 73°F |
| July | 63 | 25° / 77°F | 22° / 72°F | 323 mm | 5 | 26° / 79°F |
| August | 63 | 26° / 79°F | 23° / 73°F | 246 mm | 6 | 30° / 86°F |
| September | 67 | 24° / 75°F | 20° / 68°F | 129 mm | 5 | 28° / 82°F |
| October | 68 | 18° / 64°F | 14° / 57°F | 51 mm | 4 | 20° / 68°F |
| November | 20 | 11° / 52°F | 7° / 45°F | 51 mm | 2 | 15° / 59°F |
| December | 0 | 4° / 39°F | 0° / 32°F | 26 mm | 1 | 6° / 43°F |
Sea temperature in Seoul by month
The sea off Seoul is warmest in August at around 30°C / 86°F, and coolest in January at 2°C / 36°F. The water sits at a comfortable 21°C or warmer roughly 4 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
See Seoul on the interactive sunshine globe →
Nearby places for sunshine
- Cheongju South Korea · 125 km · best in May · 1,963 h sun/yr
- Gunsan South Korea · 175 km · best in Oct · 1,884 h sun/yr
- Yangyang South Korea · 206 km · best in May · 1,941 h sun/yr
- Gwangju South Korea · 263 km · best in Oct · 1,884 h sun/yr
- Daegu South Korea · 263 km · best in Oct · 2,111 h sun/yr
- Yeosu South Korea · 310 km · best in Oct · 2,024 h sun/yr
Nearest destinations
- Wonju South Korea · 133 km · 1,976 h sun/yr · best in May
- Pyongyang North Korea · 207 km · 2,173 h sun/yr · best in May
- Wonsan North Korea · 209 km · 2,077 h sun/yr · best in May
Head-to-head
How Seoul compares month by month: Seoul vs Cheongju · Seoul vs Gunsan · Seoul vs Yangyang · all comparisons
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