Donghae
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Donghae Weather in September

During September, Donghae experiences high daytime temperatures of 24°C (75°F) and cooler nights around 18°C (64°F). September sits within the rainy season, and part of the summer season, so expect regular and often heavy rainfall.

Rainfall in Donghae in September

Donghae is in the rainy season in September, with rain on around 10 days and an average of 194 mm (7.6 in). The rain this month falls heavily when it arrives, so waterproofs are worth keeping handy.

Temperature in Donghae in September

Temperatures in Donghae in September top out at 24°C (75°F) and drop to 18°C (64°F) overnight. Experience the summer season in September. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights cool down to 18°C (64°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Donghae in September

The area experiences a moderate amount of sunshine, with approximately 147 hours of sunlight expected. Even though this month is part of the rainy season, you could still see the sun every now and then.

If you prefer dry days with pleasant temperatures, May typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

Donghae Temperature in September

Min Temperature
18°C (64°F)
Max Temperature
24°C (75°F)
Chance of Rain
35%
Precipitation
194 mm (7.6 in)
Rainy days
10 days
Humidity
84% *
Sunshine
147 hours *
Percentage Sunshine
38% *
* Data from: Pyeongchang, South Korea (65 KM, 40 Miles).

Donghae Weather by Month

Pick a month to see the average temperature, rainfall and sunshine in Donghae - and find the best time to visit.

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Donghae typically drop from around 26°C (79°F) at the start of September to approximately 22°C (72°F) by the end. Nights are pleasant, with lows typically ranging from 12°C (54°F) to 18°C (64°F).

Average temperatures in September

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 September

Historical weather records for Donghae in September

Browse day-by-day weather records for Donghae spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Donghae historical weather extremes in September

The extremes listed below come from historical weather data collected in Donghae from 1976 through 2026.

  • On September 1, 2025, temperatures climbed to 33°C (91°F), marking the warmest September day on record.
  • The lowest daytime temperature in September was 15°C (59°F), recorded on September 30, 2001.
  • The coldest night in September in Donghae was on September 18, 1987, with a minimum of 2°C (36°F).

Best Places in South Korea in September

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 September →

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 Donghae in September

Pleasant temperatures in September 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. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Donghae in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

  • Swimming
    7/10
  • Camping
    6/10

Donghae 3-Day Forecast

More climate data for Donghae

Popular in September

Where to go in September - average daytime high across popular destinations.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.