Three Seasons in One Day! October Seoul Swings 10°C—the Packing Formula Is Three Peelable Layers
The first number to know for October Seoul isn’t the average temperature—it’s the 10°C daily swing. Here’s the thing: you shiver on the morning bus, sweat at Gyeongbokgung at noon, and shiver again by the river at night. Early month 23°/13°, late month 17°/7°. The answer isn’t one warm coat; it’s base + middle + shell. Seoulog lays out the bands and the list.