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Ganghwa Island

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Ganghwa Island Weather, Climate and Best Time to Visit

Data source:Meteostat
Update date:2025-09

Ganghwa Island year round climate

  • Spring (March–May): Average 4.2–15.1°C, mild climate gradually warming, rainfall gradually increasing. Common activities: picnics, flower viewing, cycling. Recommended clothing: light jacket, long-sleeved shirt, comfortable shoes.
  • Summer (June–August): Average 20.0–25.3°C, hot and humid, higher rainfall, especially in July. Common activities: swimming at the beach, water sports, island exploration. Recommended clothing: light and breathable clothing, sun hat, sunscreen.
  • Autumn (September–November): Average 12.8–21.8°C, cool and comfortable, sunny weather, decreased rainfall. Common activities: maple leaf viewing, hiking, harvesting agricultural products. Recommended clothing: comfortable long-sleeved shirts, light jacket, comfortable shoes.
  • Winter (December–February): Average -4.1–-1.6°C, cold and dry, low rainfall. Common activities: enjoying winter scenery, onsen experience. Recommended clothing: warm coat, hat, scarf, gloves.

Ganghwa Island climatological average

Annual average temperature: approx. 11°C / Annual rainfall: approx. 1318 mm / Summer humidity: 70%–80% / Rainiest month: July

Ganghwa Island monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
-4.1°C
16.3
February
-1.6°C
16.5
March
4.2°C
43.8
April
10.7°C
55.5
May
15.1°C
82.5
June
20°C
171
July
23.8°C
335.2
August
25.3°C
257.9
September
21.8°C
174.8
October
12.8°C
84.2
November
5.9°C
55.2
December
-2.1°C
25.9

Ganghwa Island weather for the next seven days

12/19
Friday
Patchy rain nearby
6.6°C/1.4°C
12/20
Saturday
Patchy rain nearby
8.5°C/1.3°C
12/21
Sunday
Sunny
0.5°C/-2.5°C
12/22
Monday
Sunny
1.7°C/-3.9°C
12/23
Tuesday
Moderate rain
3.6°C/-0.7°C
12/24
Wednesday
Light freezing rain
1.4°C/-3.1°C
12/25
Thursday
Sunny
1.8°C/-3.2°C