Temperatures in Montgomery County are expected to reach 100 degrees and above starting Wednesday, July 15. With humidity, it will feel closer to 105 degrees. The National Weather Service has issued a heat advisory from 11 a.m. to 8 p.m.
County agencies spent the morning posting extreme heat information and alerts on social media, urging residents to take precautions, check on vulnerable neighbors and plan for delays across public systems.
What county officials are saying online
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Vulnerable Populations: Montgomery County Health and Human Services is asking residents to check on older adults, people who live alone and anyone with medical conditions. Officials say these groups face higher risk of heat exhaustion and heatstroke.
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A/C and Fans: Emergency management officials note that fans do not prevent heat illness when temperatures reach the upper 90s. Air conditioned spaces are the safest option.
- Public Cooling Centers: County facilities, including libraries, recreation centers, senior centers and pools are open during normal hours for anyone who needs a place to cool down.
- Vehicles and Pets: Police and emergency officials are reminding residents not to leave children or pets in cars. Interior temperatures can rise to dangerous levels within minutes.
Transit alerts: Commuters face slow orders and shuttle transfers
Extreme heat can affect steel rail infrastructure. WMATA says high rail temperatures can trigger automatic heat related speed restrictions on above ground tracks. Trains may run slower for safety. Riders should expect delays and check for service alerts throughout the day.
Red Line riders may also face outdoor waits due to ongoing summer construction and shuttle transfers at closed stations. Officials advise commuters to bring water and plan extra time.
Outdoor activities and workers
County emergency managers are urging residents to move strenuous outdoor activity, including running, yard work or sports, to early morning or late evening.
Maryland environmental and labor officials are reminding employers that outdoor workers must have access to water, shade and rest breaks under state heat safety rules.
What residents should watch for
If you must be outside, officials recommend wearing lightweight clothing, drinking water often and taking breaks in the shade.
Signs of heatstroke include confusion, a rapid pulse, hot or red skin, or loss of consciousness. Emergency officials say to call 911 immediately if these symptoms appear.
Residents are encouraged to monitor updates from the National Weather Service and local agencies and to seek medical help immediately if they see signs of heat illness.
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