Best time to visit Incheon: month-by-month weather (2026)
The highest-scoring months in Incheon are Jun and Sep.
Best months
Jun and Sep
Peak season
Jun, Jul, Aug and Sep
Off season
Mar, Nov and Dec
Monthly Temperatures (°C)
Monthly Rainfall (mm)
Month-by-Month Guide
Temperature, rainfall and sunshine are measured. The visit score below is derived from those three (design spec §5.3)estimate.
Jan
Temp: -5.4°C – 2.4°C
Rain: 26mm
Sunshine: 7.2h/day
Visit score: 4.7/10
Feb
Temp: -3.5°C – 4.8°C
Rain: 26mm
Sunshine: 7.7h/day
Visit score: 4.8/10
Mar
Temp: 1.3°C – 11.3°C
Rain: 40mm
Sunshine: 8.9h/day
Visit score: 4.1/10
Apr
Temp: 7.4°C – 17.5°C
Rain: 84mm
Sunshine: 8.6h/day
Visit score: 4.7/10
May
Temp: 12.3°C – 21.4°C
Rain: 125mm
Sunshine: 8.9h/day
Visit score: 6.7/10
Jun
BestTemp: 18°C – 26.2°C
Rain: 138mm
Sunshine: 9.8h/day
Visit score: 8.2/10
Jul
Temp: 23.1°C – 29.6°C
Rain: 338mm
Sunshine: 8.1h/day
Visit score: 5.7/10
Aug
Temp: 23.8°C – 30.3°C
Rain: 214mm
Sunshine: 9.9h/day
Visit score: 5.8/10
Sep
BestTemp: 19.6°C – 26.8°C
Rain: 228mm
Sunshine: 7.8h/day
Visit score: 7.2/10
Oct
Temp: 11.2°C – 19.7°C
Rain: 81mm
Sunshine: 7.2h/day
Visit score: 6.4/10
Nov
Temp: 3.2°C – 12°C
Rain: 60mm
Sunshine: 7.8h/day
Visit score: 4/10
Dec
Temp: -3.6°C – 4.2°C
Rain: 41mm
Sunshine: 7h/day
Visit score: 3.8/10
When to go, and when not to
Based on the visit scores in the climate data, June and September stand out as the best months to visit Incheon. June combines a high of 26.2C with moderate rainfall of 138mm and 9.8 hours of average daily sunshine, while September offers a similar high of 26.8C alongside more rainfall at 228mm but still solid sunshine hours.
The trade-off is that both months fall within the wider peak season of June through September, when visitor numbers and prices tend to be higher. July is the wettest month by far, averaging 338mm of rain, and August is the hottest, with highs reaching 30.3C, so travelers sensitive to heat or heavy rain may prefer the shoulder months of June or September over the deep summer stretch.
Season Guide
Spring
March – May
Mild temperatures and blooming gardens. A great time for sightseeing with fewer crowds than summer.
Packing tips
- · Light layers
- · Rain jacket
- · Comfortable walking shoes
Summer
June – August
Warmest months with the longest days. Peak tourist season in most destinations.
Packing tips
- · Sunscreen
- · Hat
- · Light clothing
- · Refillable water bottle
Autumn
September – November
Cooling temperatures and autumn foliage. Shoulder season with good deals on accommodations.
Packing tips
- · Medium layers
- · Sweater
- · Waterproof jacket
Winter
December – February
Coldest months with shorter days. Holiday markets and winter activities in many cities.
Packing tips
- · Warm coat
- · Scarf and gloves
- · Thermal layers
- · Waterproof boots
Keep reading
Sources
- GeoNames city database — CC BY 4.0, fetched September 14, 2026
- Open-Meteo climate archive — CC BY 4.0, fetched September 21, 2026
AI-written interpretation reviewed against the data above — claude-sonnet-5, generated September 21, 2026. Every number on this page comes from a dataset named here; the formulas are public.