Evening, Maryland. The scattered showers and rumbles that popped up west of I-95 this afternoon are on their way out, and the National Weather Service offices in Baltimore/Washington (LWX, 4:18 PM update), Mount Holly (3:24 PM), and Wakefield, VA (2:08 PM, covering the lower Shore) all agree on the bigger headline: tonight settles down muggy but dry almost everywhere, and it’s the last quiet stretch before a serious heat wave takes hold Monday through midweek. No watches, warnings, or advisories are active for Maryland at this hour — but keep an eye on the week ahead, because that’s about to change.
⏱️ Tonight’s Timing
- 6–8 PM: Lingering isolated showers and a stray rumble of thunder, mainly across the Frederick/Hagerstown corridor and the western Baltimore suburbs — activity that’s already weakening as the trough responsible pulls away.
- 8–10 PM: Convection should wind down completely. Skies trend mostly cloudy west, partly cloudy east.
- 10 PM–sunrise: Dry, warm, and noticeably humid across the entire state. No additional rain expected overnight.
🗺️ Region by Region
Western Maryland
Garrett County (Deep Creek/Oakland): A few isolated showers linger early, then skies turn mostly cloudy. Low around 64°, breezy nothing more (SW 3 mph). Grab a light jacket if you’re out on the lake after dark.
Allegany County (Cumberland): Mostly cloudy, quiet, low near 68°. Winds essentially calm.
Northern & Central Maryland
Washington County (Hagerstown): Isolated showers fade early, then mostly cloudy. Low around 70°, sticky.
Frederick & Carroll Counties: Same story — any lingering shower activity clears by mid-evening, low near 70°, humid air settling in for the night.
Baltimore Metro
Baltimore City & County, Harford, Howard, Anne Arundel: Isolated shower chance early evening, then mostly cloudy and muggy overnight. Low around 73°. Windows-open weather this is not — the air will feel thick by midnight.
DC Suburbs
Montgomery & Prince George’s Counties: Isolated showers taper off, mostly cloudy, low around 73°. Tomorrow’s heat starts building right on top of tonight’s soupy air.
Southern Maryland
Charles, Calvert, St. Mary’s: Quieter than areas to the north — mostly partly cloudy, low around 73°, only a slim chance of any stray shower.
Upper Eastern Shore
Cecil, Kent, Queen Anne’s, Talbot, Caroline: Partly cloudy, low around 73°, light south winds 5-10 mph. A calm, warm night on the Shore.
Lower Eastern Shore
Dorchester, Wicomico, Somerset: Partly cloudy, low around 73°, light southerly breeze. Dry tonight, though Monday brings a slight uptick in shower chances here.
Ocean City & the Coast
Worcester County: Partly cloudy, low around 73°, winds SW 7-12 mph — a touch breezier at the beach than inland. Surf running around 2 feet with a low rip current risk for Monday. Water temps holding in the upper 70s. Ocean City Fishing Pier tides: high 10:19 AM, low 4:35 PM Monday.
🚨 Active Hazards
No watches, warnings, or advisories are active anywhere in Maryland at this time. That said, LWX’s Hazardous Weather Outlook flags rising heat concern building into the week — a Heat Advisory is looking increasingly plausible by Tuesday or Wednesday. We’ll be watching closely.
⛈️ Severe & Flooding Outlook
Tonight: essentially nil. The trough driving today’s scattered storms is exiting, and confidence is high that convection is done for the day by mid-to-late evening. Looking ahead, both LWX and Mount Holly are flagging an increasing severe weather and flash-flood threat mid-to-late week, especially Wednesday and Thursday, as a Canadian upper trough breaks down the building heat ridge. Timing and placement remain uncertain at this range, but it’s worth keeping on your radar — this could be a notable multi-day setup after days of building heat and humidity.
🥵 Heat & Humidity
Tonight is just a preview. A strong ridge builds in behind tonight’s front, and both LWX and Wakefield are talking low-to-mid 90s Monday, then upper 90s — possibly near 100° in spots — by Tuesday and Wednesday. Heat index values could approach Heat Advisory criteria (100-104 west of the Blue Ridge, 105-109 east) Tuesday through Thursday, depending on how dew points behave. This is shaping up as one of the more serious late-summer heat stretches of the year — start planning hydration and shade breaks now if you’re outdoors midweek.
💨 Winds & 🌊 Bay/Marine
Winds tonight are light across the board — mostly south to southwest 3-8 mph, a touch breezier at Ocean City. A Small Craft Advisory remains in effect on portions of the Chesapeake Bay through early Monday for southerly channeling winds, and Marine Weather Statements cover inlet areas of the Bay and the Tidal Potomac for gusty conditions. Boaters on the open Bay should expect a rougher ride than the forecast winds alone suggest.
🌙 Overnight Lows by Zone
| Western Mountains (Garrett) | ~64° |
| Cumberland/Allegany | ~68° |
| Hagerstown/Frederick/Carroll | ~70° |
| Baltimore/DC Corridor | ~73° |
| Southern Maryland | ~73° |
| Eastern Shore (Upper & Lower) | ~73-74° |
| Ocean City | ~73° |
📅 Looking Ahead
Monday: Warm and mostly sunny statewide, highs in the upper 80s to low 90s — 81° in Garrett, 89° in Cumberland/Frederick/Carroll, 88-90° in Hagerstown/Baltimore/DC suburbs and Southern Maryland, low-to-mid 90s in Salisbury (91°), and a cooler 84° at Ocean City with a chance of afternoon/evening storms along the coast (26% chance). An isolated shower or storm is possible almost anywhere, mainly west of I-95 and near the Shore late day.
Tuesday: This is where the heat really shows up — mid-90s inland (95° Frederick/Carroll, 96° Baltimore and DC suburbs), around 92-94° Cumberland/Southern MD/Shore, and upper 80s at the beach (88°). Heat indices could push toward 100-104 in spots. Sunny and mostly dry, though a stray Eastern Shore storm can’t be ruled out as afternoon disturbances slide south from Pennsylvania.
Beyond that: near-record heat likely continues into Wednesday, with the more organized severe/flash-flood threat arriving Wednesday-Thursday as the ridge finally breaks down. Some relief may arrive by next weekend behind a cold front.
Data: NWS Baltimore/Washington, Mount Holly & Wakefield.
MD Weather Alerts brings you Maryland’s most complete forecast, county by county, night after night. Stay cool out there — this week’s about to earn its heat.