Quiet, mild, and a little soupy — that’s tonight in three words. NWS Baltimore/Washington (2:48 PM update), Mount Holly (4:59 PM), and Wakefield (3:28 PM) all agree: the last moisture from the departing nor’easter clears out overnight, patchy fog develops as winds go calm, and Wednesday opens the door to a genuine warmup that carries us into the 80s by Thursday. There’s also some minor tidal sloshing to watch around the Bay and lower Shore through this evening’s high tide, but nothing that should keep you up.

Tonight’s Timeline

• Early evening (6–9 PM): Lingering clouds and a stray light shower or drizzle possible, mainly central Maryland — nothing more than a nuisance. Coastal flood advisories peak around this evening’s high tide.
• 9 PM–Midnight: Winds go light and variable, clouds start to scatter. Fog begins to form in sheltered valleys and near waterways.
• Midnight–6 AM: Patchy to locally dense fog develops across much of the state — worst in the mountains, the Potomac/Monocacy valleys, and low-lying farmland. Give yourself extra time on the morning commute.
• Sunrise Wednesday: Fog lifts and burns off through mid-morning, giving way to a mostly sunny, mild afternoon.

Region by Region

Western Maryland

Garrett (Deep Creek/Oakland): Lows near 50° under mostly cloudy skies, patchy fog developing late, winds essentially calm. A crisp mountain night — good sleeping weather with the windows cracked.
Allegany (Cumberland): Low around 55°, partly cloudy becoming patchy fog toward dawn, winds calm. Fog could be locally dense in the valley bottoms along the Potomac and Wills Creek.

Northern & Central Maryland

Washington County (Hagerstown): Low near 57°, partly cloudy trending to patchy fog, winds light out of the north. Watch for fog pockets along I-81 and the Antietam Creek lowlands overnight.
Frederick: Low around 58°, a slight (12%) chance of leftover drizzle early evening before clouds break and fog settles in overnight. Winds calm.
Carroll: Same story as Frederick — low near 58°, partly cloudy, fog risk climbing toward sunrise, essentially no wind to stir things up.

Baltimore Metro

Baltimore City & County: Low around 61°, partly cloudy, a 14% chance of a stray shower lingering early before things dry out. Light northwest winds under 5 mph.
Harford: Similar low near 61°. Southeast Harford is also under a Coastal Flood Advisory for this evening’s high tide — expect some minor ponding on low-lying roads near the water.
Howard: Low near 61°, partly cloudy, calm winds — an easy night.
Anne Arundel: Low around 61°, and like Harford, under a Coastal Flood Advisory through this evening’s high cycle — some minor nuisance flooding possible along low spots in Annapolis and other shoreline communities. Should recede as the tide falls overnight.

DC Suburbs

Montgomery: Low near 59°, a lingering 19% chance of light showers early in the evening before skies partially clear. Light west winds.
Prince George’s: Essentially the same setup — low around 59°, isolated evening shower chance fading out, calm overnight.

Southern Maryland

Charles: Low near 59°, partly cloudy becoming patchy fog. Charles is under a Coastal Flood Advisory this evening — minor tidal flooding possible along the Potomac shoreline through high tide.
Calvert: Low around 59°, partly cloudy trending to fog overnight, light southwest winds.
St. Mary’s: Low near 59°, same quiet pattern — fog develops toward dawn along the Patuxent and Potomac shorelines.

Upper Eastern Shore

Cecil: Low near 62°, patchy fog overnight, winds light out of the southwest.
Kent, Queen Anne’s, Talbot, Caroline: All running close to the Easton gridpoint — low around 62°, patchy fog developing after midnight, otherwise calm and unremarkable.

Lower Eastern Shore

Dorchester, Wicomico, Somerset: Low near 60°, mostly cloudy trending to patchy fog, light west winds. These three counties are under a Coastal Flood Statement for minor tidal flooding around this evening’s high tide cycle — expect some water on low-lying shoreline roads in spots like Cambridge and Crisfield that should recede overnight.

Ocean City & the Coast

Low near 61° under mostly cloudy skies, light southwest winds around 5 mph. Surf around 2 feet with a low rip current risk for Wednesday, water temps in the lower 70s. High tide at the Ocean City Fishing Pier is 10:43 AM Wednesday, low tide 5:12 PM. A pleasant, unremarkable coastal night — just watch for patchy fog rolling in off the water toward dawn.

Active Hazards

• Coastal Flood Advisory (Minor): Charles County — through this evening’s high tide cycle along the Potomac shoreline.
• Coastal Flood Advisory (Minor): Anne Arundel County — minor tidal flooding possible in low-lying spots, especially Annapolis, through tonight’s high tide.
• Coastal Flood Advisory (Minor): Southeast Harford County — same setup near Havre de Grace, tidal flooding possible through tonight.
• Coastal Flood Statement (Minor): Dorchester, Wicomico, and Somerset counties — minor tidal flooding possible on the Bayside of the lower Eastern Shore this evening.

No severe weather or flash flooding is expected. This is strictly a minor, tide-driven nuisance issue tied to the departing nor’easter’s leftover onshore flow — not a rainfall event.

Fog, Winds & Bay/Marine Notes

The headline overnight hazard is fog, not wind or rain. As high pressure builds in and winds go calm to light and variable, expect patchy to locally dense fog to form widely between midnight and sunrise — worst in the mountains, river valleys, and near the Bay and tidal rivers. Give yourself extra time Wednesday morning if you’re driving through Garrett, Allegany, Frederick, or along Route 50 on the Shore. On the water, winds stay light out of the north/northwest tonight before turning southerly Wednesday; nothing approaching small craft advisory territory is expected.

Overnight Lows by Zone

Zone	Low
Western Mountains (Garrett)	Near 50°
Cumberland/Hagerstown	Mid-to-upper 50s
Frederick/Carroll	Near 58°
Baltimore/DC Corridor	Around 59-61°
Southern Maryland	Near 59°
Eastern Shore (Upper & Lower)	Low-to-mid 60s
Ocean City	Near 61°

Looking Ahead

Wednesday: Fog clears to a mostly sunny, mild day statewide — highs around 79-82° in central Maryland, low 80s in Hagerstown and Cumberland, upper 70s to near 80° on the Shore, and just 73° at Ocean City with a sea breeze keeping the coast in check. Garrett stays cooler in the low-to-mid 70s.

Thursday: The warmup continues — Cumberland reaches the mid-80s (85°), Baltimore and the DC suburbs climb to the low-to-mid 80s (82-83°), and the Eastern Shore and Southern Maryland run in the low-to-mid 80s as well. Ocean City stays more moderate in the mid-70s. Sunshine dominates area-wide.

From there, a stalling front and a moisture-laden wave of low pressure bring increasing uncertainty this weekend — showers become more likely Saturday night into Sunday, with temperatures possibly swinging 10°+ either direction depending on exactly where that front settles. We’ll keep watching it. Early next week, high pressure looks to return with a noticeably cooler, drier pattern — highs in the 60s (50s in the mountains) and overnight lows dipping into the 40s, with 30s and a frost risk possible in the coldest mountain hollows.