South Korea's Hottest Summer Since 1973: 28 Heatwave Days in 2025
A record-breaking Korean summer means more high-UV days — and a stronger case for the lightweight, reapply-friendly SPF that K-beauty built its reputation on.
The Korea Meteorological Administration confirmed summer 2025 averaged 25.7°C — the hottest since record-keeping began in 1973 — with 28.1 heatwave days above 33°C, the third-highest count on record.
Meteorologists and climate reporters framed 2025 as part of a clear warming trend across East Asia, with Korea and Japan setting national heat records in the same season rather than as isolated flukes.
Questions we get a lot
How hot was South Korea's summer in 2025?
The Korea Meteorological Administration confirmed summer 2025 averaged 25.7°C, the hottest since modern record-keeping began in 1973. The season also recorded 28.1 heatwave days with temperatures above 33°C, the third-highest on record. It capped a regional trend, with Japan setting records the same summer.
Was 2025's heat unusual for the region?
No — it was part of a broader pattern. Reporting noted that Japan and South Korea both recorded their hottest summers in history in 2025, underscoring a regional warming trend rather than a one-off event. More extreme-heat days generally coincide with more high-UV hours outdoors.
Does a hotter summer mean I need different sunscreen?
Hotter, longer summers mean more days outdoors and more sweat, which makes reapplication the practical challenge. Lightweight, high-SPF formats that layer well under makeup and feel comfortable in humidity make it easier to reapply through the day. The heat itself doesn't change the UV science, but it changes how usable a formula needs to be.
r/AsianBeauty: 'With Korea this hot now, which lightweight SPF actually survives a sweaty commute without pilling?'