OSHA-NIOSH Heat Safety Tool

"The OSHA-NIOSH Heat Safety Tool is a useful resource for planning outdoor work activities based on how hot it feels throughout the day. It has a real-time heat index and hourly forecasts specific to your location. It also provides occupational safety and health recommendations from OSHA and NIOSH..."

https://www.cdc.gov/niosh/topics/heatstress/heatapp.html?fbclid=IwAR1qphbgfuj4QPxidlwAyJoH3dQ1Th_BnqD5EJqKAFpz43_q_hC_IG7Mmrc