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3-day WBGT forecast — is it safe for your child to be outside?
WBGT combines air temperature, humidity and solar radiation into one number — the same approach used in occupational and sports heat-safety science, adjusted here for how much faster children overheat.
| Safe | Caution | Warning | Danger | |
|---|---|---|---|---|
| Adult | <28°C | 28–31°C | 31–34°C | ≥34°C |
| Child | <25°C | 25–28°C | 28–32°C | ≥32°C |
Children's bodies overheat faster and cool down slower than adults. They absorb more heat relative to body mass, sweat less efficiently, and cannot always recognise or communicate distress. Heat stress in children can escalate to heat stroke within minutes — and under age 5, the risk is highest.
Sunlight is your body's most natural source of vitamin D — for most healthy people, regular safe sun exposure (like the UV 3–5 window below) covers most or all of what the body needs, without relying on supplements. Sun exposure does have real limits though: winter at high latitudes, always-covered skin, sunscreen, older age, or spending most days indoors can all cut how much you make — that's when a supplement becomes the practical fix, not the default. NIH Office of Dietary Supplements — Vitamin D →
A real calculation, not a mockup. Search a city above and this hour is computed for that city — free, every day.
Your city, your best hour to be outside — heat, air and UV weighed together. Open Premium to see today’s, calculated for the city you are looking at.
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