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Another dangerously hot day is ahead across Maryland as the prolonged heat wave continues. Heat Advisories and Extreme Heat Warnings remain in effect for much of the state, with afternoon heat index values reaching between 100° and 110° or higher in many communities. While the majority of Friday will stay dry, isolated to scattered thunderstorms may develop late in the afternoon and evening, especially across western and northern Maryland, with a few storms capable of producing gusty winds, lightning, and heavy downpours. (National Weather Service⁠)

Morning Commute (6:00 AM – 9:00 AM)

The morning commute will be quiet statewide with mostly sunny skies and warm, humid conditions already in place.

Temperatures will begin the day in the low to mid-70s across most of Maryland, with upper 60s in the higher elevations of Garrett County. Humidity will make it feel warmer than the thermometer indicates, and temperatures will rise quickly after sunrise.

Travel conditions will be excellent with dry roads, light southwest winds, and good visibility.

Daytime Forecast

Friday afternoon will once again bring dangerous heat to nearly every corner of Maryland.

Western Maryland (Garrett, Allegany, Washington):
Highs will range from the upper 80s in Garrett County to the middle and upper 90s in Allegany and Washington counties. While slightly cooler than central Maryland, the humidity will still make conditions uncomfortable. Thunderstorm chances increase late in the afternoon, especially over the mountains.

North-Central Maryland (Frederick, Carroll):
Expect highs in the upper 90s with heat index values between 102° and 107°. Most areas stay dry through the afternoon before isolated storms become possible late in the day.

Baltimore Metro (Baltimore City, Baltimore, Harford, Howard, Anne Arundel):
One of the hottest regions of the state. Afternoon temperatures will reach the upper 90s to near 100°, with heat index values commonly between 105° and 110°. Heat-related illnesses can develop quickly for anyone spending extended time outdoors.

Washington Metro & DC Suburbs (Montgomery, Prince George’s):
Highs near or just above 100° with oppressive humidity. Heat index values may approach or exceed 110° during the afternoon. Limit strenuous outdoor activity during peak heating.

Southern Maryland (Charles, Calvert, St. Mary’s):
Temperatures climb into the upper 90s with heat indices near 105° to 110°. Areas along the Chesapeake Bay and Potomac River may be a few degrees cooler but will remain extremely humid.

Upper Eastern Shore (Cecil, Kent, Queen Anne’s, Caroline, Talbot):
Highs in the middle to upper 90s inland with dangerous heat index values over 100°. Bay communities will see only modest relief.

Lower Eastern Shore (Dorchester, Wicomico, Somerset, Worcester):
Temperatures in the middle and upper 90s away from the water. Ocean City and Assateague will remain considerably cooler, generally in the lower to middle 80s, thanks to an afternoon sea breeze.

Evening Forecast

The evening remains very warm and humid with temperatures holding in the 80s well after sunset.

Isolated to scattered thunderstorms may develop from western Maryland into portions of central and northern Maryland during the late afternoon and evening. While not everyone will see rain, any storm that develops could produce:

• Gusty winds
• Frequent cloud-to-ground lightning
• Brief torrential rainfall
• Localized ponding on roads

Storm coverage becomes much more isolated farther south and across much of the Eastern Shore, where many communities will remain dry through the evening. (National Weather Service⁠)

Chesapeake Bay & Marine Forecast

Southwest winds generally 10 to 15 knots will continue across the Chesapeake Bay. Boaters should remain alert for any thunderstorms developing late in the day, as locally stronger winds and dangerous lightning can develop quickly.

Heat Safety

Friday remains another high-impact heat day across Maryland.

• Stay hydrated throughout the day.
• Take frequent breaks if working outdoors.
• Wear lightweight, light-colored clothing.
• Never leave children or pets in parked vehicles.
• Check on elderly neighbors, family, and friends.
• Walk pets during the early morning or later in the evening when pavement temperatures are lower.
• If possible, place fresh water outside for birds and local wildlife during the prolonged heat.

Forecast Highlights

• 🌞 Mostly sunny and dangerously hot statewide.
• 🌡️ High temperatures from the upper 80s in Garrett County to near 100° across central Maryland.
• 🥵 Heat index values of 100° to 110° common across much of the state.
• ⛈️ Isolated late afternoon and evening thunderstorms, mainly west and north.
• 🌙 Warm, humid evening with temperatures remaining in the 80s after sunset.

Maryland remains under the influence of an intense summer heat dome through Friday. If you have outdoor plans before the holiday weekend, complete them early in the day if possible, stay hydrated, and continue monitoring for any updated heat alerts or late-day thunderstorm development.