Heat Index Calculator — OSHA Danger Tiers & Heatstroke Prevention
Calculate the heat index feels-like temperature using the official NOAA formula. Includes OSHA danger tiers, heatstroke warning signs, and sport/worksite.
Heat Index
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Feels Like
99.7°F (Extreme Caution)
Temperature
90°F
Relative Humidity
60%
Danger Tier
▲ Extreme Caution
Safety Recommendations
Heat cramps and heat exhaustion possible. | Limit strenuous outdoor activities to early morning or evening. | Drink water frequently — don't wait until you're thirsty. | Wear lightweight, light-colored, loose-fitting clothing.
{"heatIndex":99.6777179000001,"temperature":90,"humidity":60,"dangerTier":"Extreme Caution","dangerColor":"#f97316","recommendations":["Heat cramps and heat exhaustion possible.","Limit strenuous outdoor activities to early morning or evening.","Drink water frequently — don't wait until you're thirsty.","Wear lightweight, light-colored, loose-fitting clothing."]}
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Heat Index (Feels Like)
99.7°F
Extreme Caution
NOAA Danger Tiers
Temperature
90°F
Humidity
60%
Danger Tier
Extreme Caution
Heat Index
99.7°F
Safety Recommendations (Extreme Caution)
- Heat cramps and heat exhaustion possible.
- Limit strenuous outdoor activities to early morning or evening.
- Drink water frequently — don't wait until you're thirsty.
- Wear lightweight, light-colored, loose-fitting clothing.
General Heat Safety
- Drink plenty of water before, during, and after outdoor activity — don't wait until you're thirsty
- Wear lightweight, light-colored, loose-fitting clothing and a wide-brimmed hat
- Schedule outdoor activities for cooler parts of the day (early morning or evening)
- Never leave children or pets in parked cars — temperatures can rise 20°F in 10 minutes
- Check on elderly neighbors and those without air conditioning during heat waves
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