1. Summer Monsoon Season (Jangma) Timing
South Korea’s primary summer monsoon season (*Jangma*) typically occurs between late June and late July, followed by occasional Pacific typhoons in August and September. Rain frequently arrives in concentrated torrential downpours rather than continuous light drizzle.
2. Emergency Disaster Alerts (Emergency Cell Broadcasts)
Foreign smartphones connected to Korean cellular carriers receive loud localized alarm alerts from the Ministry of the Interior and Safety. Do not panic—these inform residents of heavy rainfall advisories (*Hoyu Gyeongbo*), heatwaves, or flash flood precautions. Download the government's official multilingual safety app Emergency Ready App to receive automated translations in English.
3. Flash Flood Safety Rules
- Avoid walking alongside stream floodplains (e.g., Cheonggyecheon Stream, Dorimcheon) during heavy rain; electronic flood gates automatically close public access.
- Avoid low-lying underpasses and subterranean shopping alleys during storm warnings.