Weather in Incheon - 14-day forecast

Detailed weather forecast for Incheon, South Korea: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.

Forecast for the next days in Incheon

today☀️ 26°💧 10.2 mm

Sun🌤️ 27°💧 0.8 mm

Mon☀️ 27°💧 5.5 mm

Tue🌤️ 26°💧 2.2 mm

Wed🌧️ 21°💧 0.4 mm

Thu🌤️ 24°💧 0.2 mm

Fri☁️ 25°💧 20.4 mm

Sat☀️ 27°💧 1.4 mm

Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Wednesday 9 Sept in Incheon, the forecast high is 21°C. Typical daytime temperatures at this time of year range from 24°C to 27°C, so it will be exceptionally cool. It is cooler than 97% of similar days.

Saturday 5 Sept

26°Cnear normal

usually 24°C–27°C

night: exceptionally warm rain: more rain than usual wind: stronger than usual

Sunday 6 Sept

27°Cwarmer than usual

usually 24°C–27°C

warmer than 80% of similar days

night: exceptionally warm rain: typical rainfall wind: stronger than usual

Monday 7 Sept

27°Cnear normal

usually 24°C–27°C

night: exceptionally warm rain: more rain than usual wind: typical

Tuesday 8 Sept

26°Cnear normal

usually 24°C–27°C

night: exceptionally warm rain: more rain than usual wind: typical

Wednesday 9 Sept

21°Cexceptionally cool

usually 24°C–27°C

cooler than 97% of similar days

night: warmer than usual rain: typical rainfall wind: stronger than usual

Thursday 10 Sept

24°Ccooler than usual

usually 24°C–27°C

cooler than 74% of similar days

night: exceptionally warm rain: typical rainfall wind: typical

Friday 11 Sept

25°Cnear normal

usually 24°C–27°C

night: exceptionally warm rain: exceptionally wet wind: typical

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →

cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 25°C by day. The coolest year was 2006 (23°C) and the warmest was 2024 (30°C). The current forecast averages 25°C - close to the historical median.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Incheon

Incheon - 14-day weather forecast infographic

Incheon 30 & 45-day weather - long-range outlook

Next 16 days · forecast

25°

around 23° at night · days with rain: 11

Weeks 3-4 · avg for September

26°

around 19° at night · rain chance 29%

Weeks 5-7 · avg for October

20°

around 12° at night · rain chance 22%

The 30 & 45-day outlook for Incheon: the next 16 days are a numerical forecast updated daily - on average 25° by day and 23° at night. Further out we rely on multi-year climate averages: around 26° in September, and about 20° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Incheon

Saturday5 September 2026

☀️26°clear sky

sunrise 06:06 · sunset 18:57 · night 23° · evening 27° · rain 10.2 mm · humidity 52% · wind 7 m/s · clouds 10%

Sunday6 September 2026

🌤️27°scattered clouds

sunrise 06:07 · sunset 18:56 · night 23° · evening 28° · rain 0.78 mm · humidity 46% · wind 6 m/s · clouds 50%

Monday7 September 2026

☀️27°clear sky

sunrise 06:08 · sunset 18:54 · night 24° · evening 27° · rain 5.52 mm · humidity 42% · wind 5 m/s · clouds 6%

Tuesday8 September 2026

🌤️26°scattered clouds

sunrise 06:09 · sunset 18:53 · night 24° · evening 24° · rain 2.22 mm · humidity 48% · wind 4 m/s · clouds 42%

Wednesday9 September 2026

🌧️21°light rain

sunrise 06:09 · sunset 18:51 · night 21° · evening 22° · rain 0.35 mm · humidity 56% · wind 8 m/s · clouds 100%

Thursday10 September 2026

🌤️24°scattered clouds

sunrise 06:10 · sunset 18:50 · night 22° · evening 25° · rain 0.18 mm · humidity 40% · wind 5 m/s · clouds 42%

Friday11 September 2026

☁️25°broken clouds

sunrise 06:11 · sunset 18:48 · night 23° · evening 25° · rain 20.37 mm · humidity 45% · wind 5 m/s · clouds 77%

Saturday12 September 2026

☀️27°clear sky

sunrise 06:12 · sunset 18:47 · night 24° · evening 26° · rain 1.35 mm · humidity 38% · wind 4 m/s · clouds 4%

Sunday13 September 2026

☁️26°overcast clouds

sunrise 06:13 · sunset 18:45 · night 24° · evening 25° · rain 70.62 mm · humidity 47% · wind 4 m/s · clouds 100%

Monday14 September 2026

☁️25°overcast clouds

sunrise 06:14 · sunset 18:44 · night 22° · evening 24° · rain 84.96 mm · humidity 52% · wind 4 m/s · clouds 100%

Tuesday15 September 2026

☁️26°broken clouds

sunrise 06:14 · sunset 18:42 · night 23° · evening 25° · rain 1.44 mm · humidity 48% · wind 4 m/s · clouds 78%

Wednesday16 September 2026

☀️27°clear sky

sunrise 06:15 · sunset 18:41 · night 24° · evening 25° · rain 4.86 mm · humidity 51% · wind 4 m/s · clouds 90%

Thursday17 September 2026

☁️27°overcast clouds

sunrise 06:16 · sunset 18:39 · night 25° · evening 26° · rain 10.59 mm · humidity 53% · wind 4 m/s · clouds 100%

Friday18 September 2026

🌤️26°scattered clouds

sunrise 06:17 · sunset 18:38 · night 24° · evening 25° · rain 0.12 mm · humidity 56% · wind 4 m/s · clouds 45%

Saturday19 September 2026

🌤️27°scattered clouds

sunrise 06:18 · sunset 18:36 · night 24° · evening 25° · humidity 44% · wind 4 m/s · clouds 40%

Sunday20 September 2026

🌧️21°light rain

sunrise 06:19 · sunset 18:34 · night 21° · evening 22° · rain 1.53 mm · humidity 80% · wind 4 m/s · clouds 100%

UV index in Incheon - is it safe to sunbathe?

Today the UV index in Incheon is 7 (high) - unprotected fair skin can burn in about 30 minutes. SPF 30-50, a hat and sunglasses are a must. Better stay in shade between 11:00 and 15:00.

Sea temperature - Incheon

Water today

27°C

Week avg

26°C

Waves today

0.3 m

How's the water?

very warm

16-day sea temperature forecast:

5.09 27°C6.09 27°C7.09 27°C8.09 27°C9.09 26°C10.09 26°C11.09 25°C12.09 25°C13.09 25°C

Average sea temperature through the year:

Jan 3°CFeb 3°CMar 6°CApr 12°CMay 17°CJun 24°CJul 28°CAug 30°CSep 27°COct 21°CNov 15°CDec 8°C

Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

Incheon weather through the year

Warmest, driest months on average: April, May, June, July.

Upcoming public holidays in South Korea: Chuseok — 24 September · Chuseok — 25 September · Chuseok — 26 September.

Nearby and related places

AnyangSeoulPohangGangneungSeogwipoDaeguChangwon

FAQ - Incheon weather

What is the weather like in Incheon today?

Today it is about 26° during the day and 23° at night, clear sky.

How far ahead can I check the forecast for Incheon?

This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.