Mud festival in South Korea
In July, the peaceful seaside town of Boryeong turned into a chaos of mud for 9 days. We recommend putting this festival on your bucket list.
Incheon Weather in May
In Incheon, May brings pleasant daytime temperatures around 21°C (70°F), with nights cooling to 13°C (55°F). Expect quite a bit of rainfall this month.
Rainfall in Incheon in May
Typically around 8 days of rainfall are expected, averaging 98 mm (3.9 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Incheon in May
May is a excellent month in Incheon, with 21°C (70°F) during the day and 13°C (55°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With overnight lows of 13°C (55°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Incheon in May
There are approximately 242 hours of sunshine this month, resulting in mostly clear days.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Incheon Temperature in May
Min Temperature
13°C (55°F)
Max Temperature
21°C (70°F)
Chance of Rain
26%
Precipitation
98 mm (3.9 in)
Rainy days
8 days
Humidity
68%
Sunshine
242 hours
Percentage Sunshine
Incheon Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Incheon - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Incheon typically rise from around 21°C (70°F) at the start of May to approximately 25°C (77°F) by the end. Nights are cool, with lows typically ranging from 10°C (50°F) to 15°C (59°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather records for Incheon in May
Browse day-by-day weather records for Incheon spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Incheon historical weather extremes in May
The extremes listed below come from historical weather data collected in Incheon from 1976 through 2026.
- The warmest day in May was on May 21, 1998, with a maximum of 33°C (91°F).
- On May 2, 1977, Incheon saw its coldest May day with temperatures maxing out at 12°C (54°F).
- Incheon registered its coldest May night on May 1, 2010, with temperatures dropping to 3°C (37°F).
Best Places in South Korea in May
Find out more about the weather in South Korea and which places have the best travel conditions in this month. See all of South Korea in May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Incheon in May
Pleasant temperatures in May mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Incheon in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
Incheon 3-Day Forecast
More climate data for Incheon
Temperature Rainfall Sunshine Humidity
See the full Incheon climate overview or explore weather in South Korea.
Popular in May
Where to go in May - average daytime high across popular destinations.
Seoul
24°C (75°F) Jeonju25°C (77°F) Suwon24°C (75°F) Gyeongju25°C (77°F) Seogwipo
22°C (72°F) Incheon21°C (70°F) Busan22°C (72°F) Jeju20°C (68°F) Bucket list
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