Ulsan vs Yeosu: which is sunnier?
🇰🇷 South Korea vs 🇰🇷 South Korea · 178 km apart · long-term climate normals (NASA POWER, 2001–2020)
Ulsan and Yeosu are virtually tied for annual sunshine — about 1,954 vs 2,024 hours a year. Month by month it's balanced: each has the higher Sunshine Score in 1 month, with 10 within 2 points.
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
At a glance
| Ulsan | Yeosu | |
|---|---|---|
| Sunshine hours / year | 1,954 | 2,024 |
| Sunniest month | October (76/100) | October (78/100) |
| Nov–Feb average score | 12/100 | 10/100 |
| Jun–Aug average score | 63/100 | 63/100 |
| Rain / year | 1,323 mm | 1,407 mm |
| Warmest sea | 28°C / 82°F | 31°C / 88°F |
| Peak midday UV | 7 (high) | 7 (high) |
Ulsan vs Yeosu month by month
| Month | Sunshine Score | Day high °C | Rain mm | Sea °C | ||||
|---|---|---|---|---|---|---|---|---|
| Ulsan | Yeosu | Ulsan | Yeosu | Ulsan | Yeosu | Ulsan | Yeosu | |
| January | 0 | 0 | 6° | 4° | 42 | 29 | 13° | 5° |
| February | 0 | 0 | 8° | 7° | 53 | 48 | 13° | 7° |
| March | 25 | 26 | 12° | 12° | 74 | 69 | 13° | 10° |
| April | 52 | 58 | 17° | 18° | 112 | 114 | 15° | 16° |
| May | 68 | 69 | 21° | 24° | 118 | 119 | 17° | 21° |
| June | 63 | 63 | 24° | 27° | 150 | 164 | 20° | 25° |
| July | 63 | 63 | 27° | 29° | 240 | 295 | 20° | 28° |
| August | 63 | 63 | 28° | 30° | 194 | 264 | 28° | 31° |
| September | 63 | 63 | 25° | 26° | 168 | 157 | 28° | 30° |
| October | 76 | 78 | 20° | 21° | 76 | 67 | 23° | 22° |
| November | 47 | 41 | 15° | 14° | 54 | 47 | 19° | 16° |
| December | 0 | 0 | 8° | 7° | 42 | 34 | 14° | 9° |
The sunnier month by month: Jan even · Feb even · Mar even · Apr Yeosu · May even · Jun even · Jul even · Aug even · Sep even · Oct even · Nov Ulsan · Dec even.
When to pick which
- November–February: too close to call — Ulsan averages 12/100, Yeosu 10/100. Daytime highs are similar (9°C vs 8°C). See the winter sun ranking.
- March–May: Yeosu (average score 51/100 vs 48). Daytime highs are similar (17°C vs 18°C).
- June–August: too close to call — Ulsan averages 63/100, Yeosu 63/100. Yeosu is the warmer, around 29°C daytime highs vs 26°C.
- September–October: too close to call — Ulsan averages 70/100, Yeosu 71/100. Daytime highs are similar (23°C vs 24°C).
Sea temperature
Yeosu's sea gets warmer: 31°C / 88°F at its peak vs 28°C. Swimmable water (21°C+): Ulsan about 3 months a year, Yeosu about 6 months a year. Month-by-month sea temperatures are in the table above.
Full month-by-month guides: Ulsan weather by month · Yeosu weather by month · Best time to visit South Korea.
More comparisons: Ulsan vs Busan · Ulsan vs Daegu · Yeosu vs Busan · Yeosu vs Gwangju · Yeosu vs Jeju City · all head-to-heads