September weather forecast
Donghae, South Korea

The commencement of September in Donghae denotes a gentle farewell to peak summer and a smooth transition into autumn. With the heat easing and the frequented rainy spells reducing, the climate begins to stabilize. However, this does not eradicate rainfall entirely as remnants of the rainy season still persist. Interestingly, September tallies the highest average rainfall across the year at 241mm (9.49").

Temperature

September brings a minor shift in the average high-temperature, adjusting from a warm 27.3°C (81.1°F) in August to a still moderately hot 23.7°C (74.7°F). Donghae's September nights cool down to an average low-temperature of 15.9°C (60.6°F).

Humidity

The average relative humidity in September in Donghae, South Korea, is 79%.

Rainfall

The month with the most rainfall is September, when the rain falls for 11.8 days and typically aggregates up to 241mm (9.49") of precipitation.

Sea temperature

In Donghae, South Korea, the average seawater temperature in September is 22°C (71.6°F).
Note: When considering a person's aversion to cold, factors like sunshine, wind, and atmospheric temperature are key. Swimming in 22°C (71.6°F) might be delightful. (Remember: The Olympics' swimming events have water temperatures between 25°C (77°F) and 28°C (82.4°F).)

Daylight

In Donghae, the average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 05:53 and sunset at 18:53. On the last day of the month, sunrise is at 06:18 and sunset at 18:08 KST.

Sunshine

In Donghae, the average sunshine in September is 5.4h.

UV index

In September, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for average individuals.
Note: The daily high UV index of 7 during September translates into the following recommendations:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Attention! The combination of sand and water reflections enhances UV ray intensity.