90 F + 65% Humidity, OSHA Construction Site
Audience: Construction, roofing, landscaping, warehouse workers
Air Temp
90°F
32°C
Humidity
65%
Heat Index
103°F
39°C
Risk band
Danger
What this means
OSHA heat hazard threshold. Federal rule proposed in 2024 requires water, shade, and rest breaks at heat index 80 F, with mandatory cool-down rest at 90 F heat index.
What to do
15-minute rest in shade every 2 hours. 1 quart water per worker per hour available. New workers (first 14 days) acclimatize at half workload.
Source
OSHA Heat Exposure StandardOther Danger scenarios
Not medical advice. The NWS Steadman heat index is a general guideline; individual heat tolerance varies with acclimatization, medications, and pre-existing conditions. Consult a medical professional for individual risk assessment.