As cold and dry air moved down from the north, the morning was chilly, but this afternoon, under clear skies and direct sunlight, late-summer heat lingered with temperatures reaching around 30°C (86°F).

Clouds are expected to gradually increase across the skies tomorrow (September 17).

Meanwhile, as easterly winds strengthen tomorrow morning, strong winds will blow mainly in the southern coastal areas and Jeju.

Tomorrow morning's low in Seoul will be 17°C (63°F), up about 3 degrees from today, returning to seasonal averages. Daytime highs will rise to 28°C (82°F), keeping the daily temperature range wide at over 10 degrees.

You will need to choose your clothing carefully to cope with the large temperature differences for the time being.

Meanwhile, preliminary strong wind advisories have been issued for the southern coast and Jeju, while preliminary high waves advisories are in effect for surrounding waters.

Starting tomorrow night, strong swells will roll into the eastern coastal areas, requiring caution against safety accidents near the coast.

Tomorrow, other inland areas can also expect sudden strong gusts of wind.

Skies will be mostly cloudy, and rain will begin in Jeju from the afternoon.

Morning lows nationwide will hover around 15°C (59°F), higher than today.

Daytime highs will reach 28°C (82°F) in Seoul and 30°C (86°F) in Gwangju, bringing warm weather mainly to western regions.

Rain is forecasted for the eastern coastal areas this coming Friday, and rain will continue in Gangwon Yeongdong and Jeju until Saturday morning.

(Weathercaster Nam Yu-jin)