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Seoul forum regulars describe April as warm and genuinely spring-like, with a real range across the month: early April “about 3 to 17°C,” by late April highs reaching “the upper 60s°F” though nights stay chilly — a swing regulars quantify at roughly “10 degrees(celcius) difference between daytime and nighttime.” Rain shows up as brief but genuine downpours — “that 'April showers' thing is true in Korea, too” — though most days stay clear. Mid-April is cherry blossom season and the busiest picnic weekends of the year, so crowds at parks are part of the plan, not a surprise. Our record: 16.9°C days, 6.5°C nights, 5.8 rain days and 9.6 hours of sun — mild with a real day-night swing, matching the “spring, but pack a light jacket” read.

Forum posters describe South Korea in November, Incheon included, as cool with crowds thinning noticeably compared to peak autumn-foliage season. Posters report daytime temperatures typically 8-10C early in the month, with nights already near or below freezing, and mid-November bringing a further drop, often into the 0-10C range, genuinely requiring winter clothing by that point. Posters are direct that November sits in an awkward seasonal gap - past the vivid autumn leaves but before any real snow - making it, in some posters' view, one of the less visually rewarding months, even though the cooler weather and lighter crowds have real appeal for beach areas and quieter sightseeing. Posters generally rate November as a workable but transitional month for Incheon, cool and crowd-free rather than scenically peak.

Forum posters call May and June the best-weather stretch of the Korean year - warm days suited to short sleeves, with a thin layer still useful at night. The month itself shifts noticeably: early May can still want a light jacket or cardigan, while by month's end a t-shirt alone is usually enough. For Incheon specifically, posters point to Wolmido's theme park and traditional garden, the city's historic Chinatown (the oldest and largest in Korea), and Sorae Fish Market for fresh seafood and street food as the core things to do, with the Bupyeong underground market flagged as a particularly good option if a rainy day interrupts outdoor plans.