It’s about as sleepy a weather night as Maryland gets in early November. NWS Baltimore/Washington (LWX, issued 3:00 PM) and NWS Mount Holly (PHI, issued 2:25 PM) both keep high pressure firmly in charge tonight, with light south to southeasterly flow, mild overnight lows, and just the one wrinkle worth watching: patchy fog developing late tonight into early Wednesday morning, especially in the mountain valleys and along and east of the I-95 corridor. No alerts, no storms, no drama — just an unusually warm stretch about to tip toward wetter weather Thursday.

Tonight’s Timeline

• 7–10 PM: Clear to partly cloudy skies statewide, light southerly breeze, temperatures easing down comfortably from the 60s into the 50s.
• 10 PM–2 AM: Winds go calm to light. Radiational cooling sets in under clear skies — mountain valleys and low-lying spots start to cool fastest.
• 2–7 AM: Patchy fog develops, favoring interior valleys in Garrett/Allegany and areas along and east of the Blue Ridge and I-95 corridor as moisture creeps in ahead of the weekend’s pattern change. Not expecting widespread dense fog, but a few pockets could cut visibility for the early commute.
• 7–10 AM Wednesday: Fog burns off, sunshine returns, and temperatures climb quickly into a very mild Wednesday.

Region by Region

Western Maryland

Garrett County (Deep Creek/Oakland): Low around 48° — upper 40s. Mostly clear early, patchy fog developing toward dawn. Light SE wind around 5 mph. Essentially rain-free (1% chance). Grab a light jacket if you’re out late on the lake trails; valley fog could linger a touch past sunrise.

Allegany County (Cumberland): Low near 49°. Same story — mostly clear skies giving way to patchy valley fog overnight, wind light out of the northeast. Quiet night, no travel concerns beyond the fog window.

Northern & Central Maryland

Washington County (Hagerstown): Low around 51°, wind SE near 7 mph, mostly clear. Only a 2% precip chance — a dry, mild night.

Frederick County: Low near 52°, mostly clear early with patchy fog possible toward morning, especially in the lower valleys. Light south wind.

Carroll County: Sharing Frederick’s gridpoint — low around 52°, same mostly clear-then-patchy-fog setup, light winds.

Baltimore Metro

Baltimore City & County: Low near 53°, mostly clear with patchy fog possible closer to dawn, especially in low-lying spots along streams and the harbor. Winds light and variable from the south, under 5 mph.

Harford County: Tracking the Baltimore/Central MD grid closely — low around 53°, same quiet, mild, mostly-clear setup with a fog watch toward morning.

Howard County: Same low-50s night, mostly clear, light south winds, fog risk increasing after midnight.

Anne Arundel County: Low around 53°, calm winds, clear skies early — any patchy fog would favor areas near the Bay and tidal creeks toward sunrise.

DC Suburbs

Montgomery County: Low near 52°, mostly clear, light south wind around 5 mph. Patchy fog possible in the usual low spots — the Potomac bottomlands, Rock Creek valley — before sunrise.

Prince George’s County: Essentially identical — low around 52°, calm and clear overnight with a late-night/early-morning fog risk.

Southern Maryland

Charles, Calvert & St. Mary’s Counties: Low near 53° across the board, mostly clear early with patchy fog developing overnight — river and creek-adjacent spots (Patuxent, Potomac shorelines) are the likeliest to see it thicken up toward dawn. Light south wind near 6 mph, no rain.

Upper Eastern Shore

Cecil, Kent, Queen Anne’s, Talbot & Caroline Counties: Low around 52° (Easton gridpoint), mostly clear transitioning to patchy fog overnight, especially near the Chester and Choptank. Light south wind 5-10 mph. Essentially dry — 2% chance.

Lower Eastern Shore

Dorchester, Wicomico & Somerset Counties: Low near 51° (Salisbury grid), partly cloudy early then patchy fog, light south wind around 5 mph. Marshy lowlands around Blackwater and the Nanticoke could see the thickest patches.

Ocean City & the Coast

Worcester County: A milder coastal low near 56°, partly cloudy with patchy fog possible, light south wind around 6 mph. Surf and rip current risk are low tonight with winds staying light out of the south — a calm night on the beach and boardwalk. No marine hazards are in effect for Maryland waters tonight per today’s Hazardous Weather Outlook from LWX.

Active Hazards

None. There are no watches, warnings, or advisories in effect for Maryland at this time. Today’s Hazardous Weather Outlook from NWS Baltimore/Washington, covering the Bay, tidal Potomac, and the I-95 corridor, explicitly states no hazardous weather is expected tonight.

Severe & Flooding Potential

None tonight or Wednesday. The next flooding/storm conversation starts Thursday, when a front moves through bringing scattered showers and a few thunderstorms, with better rain chances — and a heavier rain threat — arriving Thursday night into Friday across the state, especially toward the Eastern Shore and Southern Maryland.

Heat, Humidity & Winds

Nothing extreme tonight — temperatures running several degrees above normal for early November, humidity ticking up slightly as southerly flow draws in moisture (that’s your fog fuel). Winds light out of the south to southeast all night, generally under 10 mph. Wednesday will feel downright summery for November, with highs widely in the low-to-mid 70s and a few spots in the lee of the Alleghenies or south/east of DC flirting with the upper 70s.

Chesapeake Bay & Marine

Calm tonight — winds light out of the south/southeast, no marine hazards expected through Wednesday morning per LWX. Some southerly channeling is possible Wednesday evening into Thursday morning on the open and middle Bay waters, but confidence is low. Boaters should watch for a shift toward northwesterly winds and possible Small Craft Advisory-level gusts by Saturday afternoon behind the first cold front.

Overnight Lows by Zone

Zone	Low
Western Mountains (Garrett/Allegany)	Upper 40s (48–49°)
Cumberland/Hagerstown	Around 49–51°
Frederick/Carroll	Around 52°
Baltimore/DC corridor	Low-to-mid 50s (52–53°)
Southern Maryland	Around 53°
Eastern Shore	Low-to-mid 50s (51–52°)
Ocean City	Mid-50s (56°)

Looking Ahead

Wednesday: A repeat of today, basically — patchy morning fog clearing to mostly sunny skies, highs in the low-to-mid 70s nearly statewide (upper 60s at the beach, upper 70s possible in spots west of the mountains and south/east of DC). Dry all day, with clouds building late.

Thursday: The pattern finally breaks. A front crosses the state during the day, bringing scattered showers and a few thunderstorms, mainly west to east. Rainfall amounts generally a tenth to a quarter inch, locally higher west of the Alleghenies. Highs still mild, low-to-mid 70s (60s in the mountains). Rain chances increase further Thursday night into Friday, with Southern Maryland and the Eastern Shore looking at the better chance of steadier, locally heavier rain — storm totals near a quarter to half an inch through Friday night, possibly more south toward the Virginia line.

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Data: NWS Baltimore/Washington, Mount Holly & Wakefield.

MD Weather Alerts — your director’s-cut forecast, every morning and night. Sleep well, Maryland; the fog’s the only thing stirring tonight.