Pick a city and get the next 7 days: how hot it feels, the heat-risk band, the UV index, the cool hours to walk, how much water to carry and when to put sunscreen back on.
Was this useful?
City and day out
The forecast comes from Open-Meteo when you tap; nothing is sent about you except the city's coordinates.
Heat-risk bands
Heat index (temperature plus humidity, in the shade) categories from the US National Weather Service. Full sun can add up to about 8°C (15°F)15°F (8°C).
Band
Heat index
What can happen
Caution
27–32°C (80–90°F)80–90°F (27–32°C)
Fatigue is possible with long exposure and activity.
Extreme caution
32–39°C (90–103°F)90–103°F (32–39°C)
Heat cramps and heat exhaustion possible with long exposure and activity.
Danger
39–52°C (103–125°F)103–125°F (39–52°C)
Heat cramps and heat exhaustion likely; heat stroke possible with long exposure and activity.
Extreme danger
52°C (125°F)125°F (52°C)+
Heat stroke highly likely.
UV index categories (WHO): 0–2 low, 3–5 moderate, 6–7 high, 8–10 very high, 11+ extreme. Protect your skin from 3 up.
Staying cool
Plan indoor sights (museums, malls, covered markets) for the hot middle of the day, and walk early and late.
Drink before you're thirsty and add salt or an electrolyte sachet when you sweat a lot; don't drink more than about 1.5 L an hour.
Light, loose, light-coloured clothes, a wide-brimmed hat and sunglasses; seek shade between 11:00 and 15:00.
Heat exhaustion: heavy sweating, dizziness, headache, nausea, cramps — get to shade or AC, cool the skin, sip water.
Heat stroke is an emergency: hot skin, confusion, fainting or no sweating — call emergency services and cool the person at once.
Children, older travellers, pregnancy and some medicines (diuretics, some blood-pressure and mental-health drugs) raise the risk.
General information, not medical advice. Water amounts are a rough guide for a healthy adult walking (checked 2026-09); needs vary with body size, pace and sweat. Keep the local emergency number handy, and your health card if you take regular medicines.