OceanCalc

Heat Index Calculator

Calculate heat index and heat-related health risks.

Current Conditions
°F

Heat index is most relevant above 80°F

%
Heat Index Levels
< 80°FNo discomfort
80-90°FCaution
91-103°FExtreme Caution
104-125°FDanger
> 125°FExtreme Danger
Heat Safety Tips
  • Stay hydrated - drink water before feeling thirsty
  • Wear lightweight, light-colored, loose clothing
  • Limit outdoor activities during peak heat
  • Take frequent breaks in shade or AC
  • Never leave children or pets in parked vehicles
  • Watch for heat exhaustion symptoms
Heat Index
Feels Like103°F
Celsius39.4°C
Actual Temp90°F

Extreme Caution

Heat cramps and exhaustion possible