Dealing with Thailand's Heat: How to Stay Cool and Safe

Thailand's climate ranges from hot-and-humid to very-hot-and-humid — there is no cold season. The hottest period is March to May (up to 40°C in Bangkok, Chiang Mai, and the north), the rainy season (June–October) brings relief from heat via afternoon rains but maintains high humidity, and November–February is the coolest and most comfortable period (25–33°C). Heat strategies that work: hydrate continuously, not just when thirsty — add electrolyte powder or drink coconut water rather than plain water in extreme heat. Avoid outdoor activity between 11am and 3pm, when UV index and temperature peak. Use SPF 50+ sunscreen and reapply every 2 hours — Thai sun burns faster than most visitors expect. Wear light, loose, breathable clothing in natural fibres (linen, cotton) or modern moisture-wicking synthetics. A small folding fan and a spritz bottle of water provide immediate cooling. Air-conditioning in Thailand is powerful — carry a light layer for malls, buses, and restaurants, which are often uncomfortably cold. Watch for signs of heat exhaustion: heavy sweating, weakness, rapid pulse, nausea, headache. Move to shade and a cool environment, drink electrolytes, and seek medical attention if symptoms worsen or do not improve within 30 minutes. Heat stroke (no sweating, very high body temperature, confusion) is a medical emergency — call 1669 (Thailand's emergency medical number) immediately.