Ringed by mountains like Gyeryongsan and Sikjangsan, Daejeon is known for summer heat second only to Daegu, and for unpredictable weather that can bring a surprise snowstorm even after spring has begun. Here's a breakdown of Daejeon's weather, historical records, and seasonal tips.
Daejeon sits in a basin ringed by mountain ranges — Gyeryongsan, Sikjangsan, Bomunsan — with the Geumgang River running near the city center. Because the basin terrain traps summer heat, the city sees intense heat waves, and between winter and early spring, a strong low-pressure system can bring more snow than expected.
Ringed by mountains like Gyeryongsan and Sikjangsan, Daejeon traps summer heat in the city, making it one of the hottest inland cities alongside Daegu. It reached 39.4°C on August 15, 2018.
Even in March, after spring has begun, a strong low-pressure system passing through can bring surprisingly heavy snow. On March 5, 2004, 49cm fell in a single day — the heaviest daily snowfall in 69 years of observation at the time.
Moisture from the Geumgang River, which runs near downtown, cools on autumn and winter mornings and often produces fog along riverside roads. Slow down for reduced visibility if you're driving early in the morning.
In spring, the basin terrain traps fine dust, and snowstorm risk should stay on your radar through March. Summer brings intense basin-driven heat waves, and autumn and winter call for caution around Geumgang River fog and wide daily temperature swings. For general season-by-season tips, see the seasonal outdoor guide.
Based on official KMA observations at the Daejeon Weather Station.
| Record | Value | Date |
|---|---|---|
| Record high | 39.4°C | 2018-08-15 |
| Record low | -19.0°C | 1969-02-06 |
| Heaviest daily snowfall | 49cm | 2004-03-05 |
On summer days with a heat advisory, avoid outdoor activity during peak daytime hours, and if heavy snow is forecast even in March, get winter gear ready just as you would in deep winter. Slow down for morning fog near the Geumgang River. For general threshold-by-threshold guidance on UV, feels-like temperature, and fine dust, see what to do.
Because Daejeon's old town and newer areas like Yuseong-gu and Dunsan-dong feel different, searching for and adding a specific neighborhood in sanCheck gives you a more accurate weather and outdoor-activity score. Save the places you check often — home, work — and tap between chips to compare.