Maryland is heading into the first major day of this heat wave, and Wednesday is the day the heat becomes a serious weather concern for much of the state.
The morning starts mostly quiet and manageable, but temperatures rise quickly after sunrise. By late morning and afternoon, many inland areas will be in the 90s, with heat index values climbing over 100 degrees in several counties. For parts of central Maryland, the Baltimore metro, the D.C. suburbs, northern Maryland, and Southern Maryland, it may feel closer to 105 degrees or higher during the hottest part of the day.
This is not just a typical warm summer day. This is the beginning of a dangerous stretch of heat that continues into Thursday and Friday.
The main message for Wednesday: the morning is the safest part of the day to be outside. By afternoon, heat becomes the main concern across Maryland.
Statewide Overview
Wednesday will be hot, humid, and mostly dry across Maryland.
Most areas will see plenty of sunshine through the day. Rain chances are low, but not completely zero. A few isolated showers or storms may try to develop during the afternoon or evening, especially near the mountains, along the Blue Ridge, or near local bay/river breeze boundaries. Most Marylanders will not see rain, but any storm that develops could briefly produce gusty winds, heavy rain, and lightning.
The bigger and more widespread issue is the heat.
Heat Advisories are in effect for many parts of Maryland from late morning through the evening. The highest heat index values are expected away from the mountains and away from the immediate Atlantic beaches.
The hottest areas will likely be along and east of the Blue Ridge, the I-95 corridor, the Baltimore metro, the D.C. suburbs, inland Southern Maryland, and inland parts of the Eastern Shore.
Western Maryland and the beaches will be somewhat cooler, but not everyone in those areas is fully out of the heat risk. Allegany and Washington counties will still be very hot, and beach areas will still feel humid even with the ocean influence.
Morning Commute Forecast: 6 AM to 9 AM
The Wednesday morning commute looks dry and quiet across Maryland.
Roads should be in good shape statewide with no widespread rain, storms, or fog expected during the main commute window. Temperatures will already be warm, especially across the Baltimore metro, central Maryland, Southern Maryland, and the Eastern Shore.
Morning temperatures will generally start in the upper 60s to mid 70s. Garrett County and the highest elevations will be cooler, while urban and Bay-adjacent areas may start closer to the mid 70s.
The morning is the best time for outdoor errands, dog walks, yard work, and anything strenuous outside. Conditions become much more uncomfortable by late morning and afternoon.
Daytime Forecast
Wednesday afternoon is when the heat becomes dangerous.
Most inland areas of Maryland will reach the 90s. Some locations may approach the upper 90s to near 100 degrees, especially across central Maryland, the Baltimore/Washington corridor, and inland Southern Maryland.
Humidity will push heat index values higher than the actual temperature. In many areas, it may feel like 100 to 106 degrees during the afternoon. A few spots may feel even hotter.
This is the type of heat that can cause heat exhaustion or heat illness if people are outside too long without breaks, shade, water, or air conditioning.
Outdoor work, sports practices, camps, errands, and events should be adjusted around the heat. The safest windows are early morning and later evening.
Evening Forecast
Wednesday evening stays very warm and humid.
Temperatures will slowly fall through the 90s and 80s after sunset, but many areas will not cool down quickly. Urban areas, especially Baltimore City and the I-95 corridor, may hold onto the heat longer into the evening.
A stray shower or thunderstorm cannot be ruled out early in the evening, but most of Maryland stays dry. If a storm does develop, it could produce gusty winds and a quick downpour, but storm coverage should remain limited.
Evening outdoor plans are not automatically canceled, but it will still feel hot. People should continue to drink water, take breaks, and avoid pushing too hard outside.
Heat Alerts & Concerns
Heat Advisories are in effect for many Maryland counties during the late morning, afternoon, and early evening.
The advisory areas include much of north-central Maryland, central Maryland, the Baltimore metro, northeast Maryland, the D.C. suburbs, parts of western Maryland, and Southern Maryland. This includes areas such as Washington, Allegany, Frederick, Carroll, Montgomery, Howard, Baltimore, Harford, Cecil, Anne Arundel, Prince George’s, Charles, Calvert, and St. Mary’s counties.
The Maryland Eastern Shore also needs to prepare for worsening heat later this week. Parts of the Upper, Mid, and Lower Eastern Shore are under Extreme Heat Watches for Thursday into Friday or Saturday, when the heat may become even more dangerous.
Heat safety matters today:
- Drink water before you feel thirsty
- Take breaks in shade or air conditioning
- Limit outdoor work during the afternoon
- Check on older adults and neighbors without reliable cooling
- Never leave children or pets in a vehicle
- Walk pets early or late, not during peak heat
- Watch pavement temperatures for dogs
- Know the signs of heat exhaustion and heat stroke
County-by-County Forecast
Garrett County
Garrett County stays the coolest part of Maryland, but Wednesday will still feel warmer than earlier this week. Oakland, Deep Creek Lake, Grantsville, and surrounding areas should expect highs mainly in the upper 70s to lower 80s. The morning is comfortable, the afternoon is warm, and a stray mountain shower or storm is possible. Heat impacts are lower here compared to the rest of the state, but sun exposure can still add up.
Allegany County
Allegany County will be hot, especially in the lower elevations. Cumberland and nearby valley areas may reach the upper 80s to lower 90s, with heat index values around or above 100 possible. Frostburg and higher elevations will be somewhat cooler. A Heat Advisory is in effect for central and eastern Allegany County, so outdoor work should be limited during peak heating.
Washington County
Washington County turns very hot Wednesday afternoon. Hagerstown, Williamsport, Boonsboro, Hancock, and surrounding areas should expect highs in the 90s with heat index values possibly reaching around 100 to 104. A Heat Advisory is in effect from late morning through evening. Morning is the best time for errands and outdoor activity.
Frederick County
Frederick County will be hot and humid. Frederick, Thurmont, Brunswick, Urbana, Walkersville, and surrounding communities should expect highs in the mid to upper 90s. Heat index values may climb above 105 in some areas. A Heat Advisory is in effect. Outdoor work and sports should be moved earlier or later if possible.
Carroll County
Carroll County will have a hot, mostly sunny day. Westminster, Eldersburg, Hampstead, Mount Airy, and nearby communities should expect highs in the 90s, with heat index values near or above 105 possible. A Heat Advisory is in effect. Rain chances are low, but a stray late-day storm cannot be ruled out.
Montgomery County
Montgomery County will be dangerously hot Wednesday afternoon. Rockville, Germantown, Gaithersburg, Silver Spring, Bethesda, Clarksburg, Olney, and nearby areas should expect highs in the mid to upper 90s. Heat index values may reach 105 or higher. A Heat Advisory is in effect. This is a day to avoid long outdoor exposure during the afternoon.
Howard County
Howard County will be hot and humid with mostly sunny skies. Columbia, Ellicott City, Elkridge, Laurel, and surrounding areas should expect highs in the mid to upper 90s, with heat index values likely above 100 and possibly near 105. A Heat Advisory is in effect. Evening temperatures will remain very warm.
Baltimore County
Baltimore County will be very hot Wednesday. Towson, Catonsville, Parkville, Perry Hall, Owings Mills, Reisterstown, Dundalk, Essex, and northern county areas should expect highs in the mid to upper 90s. Heat index values may reach 105 or higher. A Heat Advisory is in effect. Areas near the water may be slightly cooler, but it will still feel oppressive.
Baltimore City
Baltimore City will feel especially hot because urban areas hold onto heat. Highs may reach the upper 90s, with heat index values near or above 105. A Heat Advisory is in effect. The evening will remain very warm, and there may be limited relief after sunset. Anyone without reliable cooling should seek a cooler place during the afternoon.
Harford County
Harford County will be hot and humid. Bel Air, Aberdeen, Havre de Grace, Edgewood, Joppatowne, Fallston, and surrounding areas should expect highs in the 90s. Heat index values may reach 105 or higher, especially away from the water. A Heat Advisory is in effect. A stray evening storm cannot be ruled out, but most areas stay dry.
Cecil County
Cecil County will be very hot Wednesday. Elkton, North East, Rising Sun, Perryville, Chesapeake City, and nearby communities should expect highs in the 90s with heat index values near or above 105 possible. A Heat Advisory is in effect. Most of the day stays dry, but a very isolated late-day storm is possible.
Anne Arundel County
Anne Arundel County will be hot and humid. Annapolis, Glen Burnie, Severna Park, Crofton, Odenton, Pasadena, and surrounding areas should expect highs in the 90s. Areas right along the Chesapeake Bay may be slightly cooler, but humidity will still make it feel dangerous. A Heat Advisory is in effect. Boaters and outdoor workers should take the heat seriously.
Prince George’s County
Prince George’s County will be one of the hotter areas of Maryland. Bowie, College Park, Laurel, Greenbelt, Upper Marlboro, Hyattsville, and surrounding communities should expect highs in the mid to upper 90s. Heat index values may climb above 105. A Heat Advisory is in effect. Afternoon outdoor activity should be limited.
Charles County
Charles County will be hot and humid Wednesday. Waldorf, La Plata, Indian Head, Bryans Road, and nearby communities should expect highs in the mid to upper 90s. Heat index values may reach or exceed 105. A Heat Advisory is in effect. The evening remains warm and muggy.
Calvert County
Calvert County will be hot, even with some water influence near the Bay. Prince Frederick, Dunkirk, Chesapeake Beach, North Beach, Lusby, and Solomons should expect highs in the 90s inland, with slightly cooler readings close to the water. Heat index values around 105 are possible. A Heat Advisory is in effect.
St. Mary’s County
St. Mary’s County will be hot and humid. Leonardtown, Lexington Park, California, Charlotte Hall, and surrounding areas should expect highs in the 90s inland, with slightly cooler readings near the water. Heat index values around 105 are possible. A Heat Advisory is in effect. Evening plans will still feel very warm.
Kent County
Kent County will be hot and humid, especially inland. Chestertown, Rock Hall, Galena, and nearby areas should expect highs in the lower to mid 90s. The Bay may help slightly near the water, but the heat will still be noticeable. Kent County is included in an Extreme Heat Watch for later this week, when conditions may become even more dangerous.
Queen Anne’s County
Queen Anne’s County will be hot Wednesday. Centreville, Stevensville, Kent Island, Grasonville, and surrounding areas should expect highs in the lower to mid 90s, with slightly cooler conditions near the Bay. Heat risk increases further Thursday into Saturday under an Extreme Heat Watch.
Talbot County
Talbot County will be hot and humid. Easton, St. Michaels, Oxford, Trappe, and surrounding areas should expect highs in the lower to mid 90s. Waterfront areas may be slightly cooler, but inland areas will feel hotter. Talbot County is under an Extreme Heat Watch for later this week.
Caroline County
Caroline County will be one of the hotter inland Eastern Shore counties. Denton, Greensboro, Ridgely, Federalsburg, and surrounding areas should expect highs in the mid to upper 90s. Heat index values may approach or exceed 100. Caroline County is under an Extreme Heat Watch for Thursday through Saturday, when the heat may become more dangerous.
Dorchester County
Dorchester County will be hot and humid. Cambridge, Hurlock, Secretary, and surrounding areas should expect highs in the lower to mid 90s inland. Areas near the water may be a little cooler, but humidity remains high. Dorchester County is under an Extreme Heat Watch for Thursday into Friday.
Wicomico County
Wicomico County will be hot and mostly dry Wednesday. Salisbury, Fruitland, Delmar, and nearby communities should expect highs in the lower to mid 90s. Heat index values may reach the low 100s. Wicomico County is under an Extreme Heat Watch for Thursday into Friday.
Somerset County
Somerset County will be hot and humid inland. Princess Anne, Crisfield, Deal Island, and surrounding areas should expect highs in the lower to mid 90s, with slightly cooler readings near the water. Heat risk becomes more serious Thursday into Friday under an Extreme Heat Watch.
Worcester County
Worcester County will vary by location. Inland areas such as Snow Hill, Berlin, and Pocomoke City should reach the lower to mid 90s, while Ocean City and Assateague stay cooler with highs mainly in the 80s. Inland Worcester County is under an Extreme Heat Watch for Thursday into Friday. The beaches are cooler, but sun and humidity still matter.
Chesapeake Bay & Beaches
The Chesapeake Bay may provide a little cooling right along the shoreline, but it will not eliminate the heat risk.
Annapolis, Kent Island, Rock Hall, Havre de Grace, North Beach, Chesapeake Beach, Cambridge, Solomons, and other Bay communities should still expect hot and humid conditions.
Ocean City and Assateague will be cooler than inland Maryland, mainly in the 80s, but beachgoers still need to drink water, use sunscreen, and take breaks from direct sun.
Boaters should be careful with heat exposure. Being on the water can make it easier to underestimate dehydration and sun exposure.
Bottom Line
Wednesday is the first major day of the heat wave across Maryland.
The morning commute is dry and manageable, but the afternoon turns dangerously hot for many areas. Heat Advisories are in effect for a large part of Maryland, with heat index values near or above 105 possible in some communities.
Most of the state stays dry, but a stray afternoon or evening storm cannot be ruled out.
The heat gets even more serious Thursday and Friday, so Marylanders should take Wednesday seriously and prepare for a prolonged stretch of dangerous summer heat.
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