What: Extreme heat is reshaping Korean shopping patterns — pushing spend toward mornings, evenings and online, while department stores and cafes function as air-conditioned refuges.

Why it is important: Older shoppers (60+) showed the sharpest behavioural adaptation — more delivery-app use, more evening grocery visits, more convenience-store shopping — flagging a segment worth targeting specifically as heat waves become more frequent.

A Shinhan Card analysis of a month of card spending in the greater Seoul area found that heat wave days (highs of 33°C/91.4°F or above) reshape not just what Koreans buy but when and where. Supermarket transactions rose 7.3% and online transactions 4.1%, with average spend per transaction up 5.2% and 11.6% respectively, pointing to stock-up behaviour rather than more frequent small purchases.

Department stores and cafes moved differently: transactions ticked up modestly while average spend per visit fell, suggesting they are increasingly used as places to linger in air conditioning rather than primary shopping destinations. Taxi rides rose while average fares fell, implying more short hops to avoid walking in the heat.

Spending also shifted in time: mornings (6–11 a.m.) gained share while afternoons (3–6 p.m.) lost it, most visibly at hospitals, pharmacies, traditional markets and outlets. Evening spending (6–9 p.m.) rebounded, especially among consumers aged 60 and older, who also increased delivery-app and convenience-store use and nearly doubled ice cream and shaved-ice purchases. Online basket sizes surged most sharply in the afternoon heat window.

IADS Notes: The pattern is not new to 2026. A comparable "mallcation" effect surfaced in Korea a year earlier, when Lotte, Shinsegae and Hyundai reported double-digit visitor growth during a heatwave and monsoon stretch, leaning on F&B and experiential programming to convert weather-driven footfall into spend — the same footfall-up, refuge-seeking logic now visible in the Shinhan Card data for department stores and cafes. The online-basket effect has a parallel too: UK online non-food sales jumped and penetration hit 39% during a summer heatwave month as in-store food sales fell, echoing the 35.4% surge in average online transaction value seen here between 3 and 6 p.m. on heat wave days. The indoor-refuge dynamic extends beyond department stores as a format: Indian mall retailers posted a 15–20% sales increase as extreme heat pushed shoppers toward air-conditioned destinations, reinforcing that the retreat-from-heat behaviour documented by Shinhan Card is a recurring, cross-market response rather than a one-off local effect.

Extreme heat is changing where Koreans shop — and when they do it