Monthly climate averages for Incheon, South Korea. Based on 10-year ERA5 reanalysis data.
Cwa Humid Subtropical (dry winter)
Climate OverviewIncheon, South Korea in December has cold conditions, with highs averaging around 3.3°C (38°F). Sea temperature stays cool at 8°C (46°F).
This month falls at the beginning of Winter. Cold conditions dominate the month.
Daily highs in December gradually drop from around 5°C (41°F) at the start to 2°C (35°F) by month's end.
December sees fairly even rainfall, totalling about 27 mm across the month.
The warmest days tend to fall around the 8th, averaging 5.9°C (43°F).
Compared to November, this month is about 8°C cooler with 1 fewer rainy days.
Daily averages based on historical data (2016–2025)
Cold daytime highs of 3°C (38°F) mean shorter outdoor excursions with warming breaks.
Rain is uncommon in this month, so most days stay dry from morning through evening.
Recent yearly records for December have stayed close to the long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 2°C / -5°C | -3°C / -10°C | 3days (18 mm) Excellent | 7.6h Good | 61% Muggy | 2.7 Moderate | Poor | View Details |
| February | 4°C / -4°C | -1°C / -8°C | 4days (24 mm) Good | 8.3h Good | 64% Muggy | 3.6 Moderate | Poor | View Details |
| March | 10°C / 2°C | 7°C / -2°C | 5days (36 mm) Good | 9.2h Good | 72% Muggy | 5.1 High | Poor | View Details |
| April | 15°C / 7°C | 14°C / 5°C | 6days (58 mm) Good | 9.4h Good | 73% Muggy | 5.8 High | Good | View Details |
| May best | 20°C / 13°C | 20°C / 12°C | 8days (99 mm) Wet | 10h Excellent | 77% Humid | 6.1 High | Excellent | View Details |
| June best | 25°C / 18°C | 27°C / 19°C | 8days (108 mm) Wet | 9.9h Good | 81% Humid | 6.9 High | Excellent | View Details |
| July | 28°C / 23°C | 32°C / 26°C | 15days (264 mm) Wet | 8.4h Good | 87% Very Muggy | 6.6 High | Wet | View Details |
| August | 29°C / 24°C | 33°C / 27°C | 14days (228 mm) Wet | 8.7h Good | 84% Humid | 6.5 High | Wet | View Details |
| September best | 25°C / 19°C | 27°C / 20°C | 9days (145 mm) Wet | 8.2h Good | 79% Humid | 5.2 High | Excellent | View Details |
| October | 18°C / 11°C | 17°C / 10°C | 7days (72 mm) Good | 7.9h Good | 74% Muggy | 4.1 Moderate | Good | View Details |
| November | 11°C / 4°C | 8°C / 0°C | 6days (45 mm) Good | 7.6h Good | 71% Muggy | 3.1 Moderate | Fair | View Details |
| December | 3°C / -4°C | -1°C / -8°C | 5days (27 mm) Good | 7.3h Good | 64% Muggy | 2.4 Moderate | Poor | View Details |
Full winter gear is a must — insulated coat, thermal base layers, warm hat, gloves, and waterproof boots.
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