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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Korea, check out our Donghae's climate page.
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% *
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 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 2025.
- 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
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 monthWhat To Do in Donghae in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Korea, check out our Donghae's climate page.
Temperature Rainfall Sunshine Humidity
See the full Donghae climate overview or explore weather in South Korea.
