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Heat Index Risk Calculator
Enter the air temperature and humidity to find the real-feel heat index and get color-coded clothing recommendations.
15°C50°C
10%100%
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Heat Index (Feels Like)
33°C / 91°F
Extreme Caution
Heat cramps and heat exhaustion possible.
Clothing Recommendations
- ✓ UPF 50+ lightweight long-sleeve
- ✓ Light-colored fabric only
- ✓ Wide-brim hat essential
- ✓ Neck buff / gaiter
Reduce activity intensity. Hydrate every 20 minutes.
Uses the NWS Rothfusz heat index equation. Applicable at temperatures ≥ 80°F (27°C) with humidity ≥ 40%.