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St. Mary's Lake is one of the reservoirs LakeRadar tracks in Maryland. It covers roughly 250 surface acres. Fish documented in the area include Common Carp, Black Crappie, Pumpkinseed Sunfish, and Largemouth Bass. Water data on this page comes from a mapped monitoring station near the lake. Below you will find an hourly and 7-day forecast, wind and gust outlook, water readings, fishing conditions, and activity scores for boating, paddling, and swimming. This page combines the live forecast, wind, and conditions for St. Mary's Lake so you can plan a visit.
Updated
No active alerts for this lake as of the last check (Oct 11, 2:49 PM EDT). Alerts are re-checked automatically; see the official source for updates.
Overall Poor (52/100) across 4 activities. Best right now: Sailing (58/100).
How the score is calculated →Best excellent fishing window, averaging 94/100 across these hours. Wind 6 mph from the northwest. Dusk hours (18:00 local). Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 70° | 70° | 70° | 70° | 69° | 69° | 69° | 70° | 70° | 69° | 68° | 67° | 66° | 65° | 64° | 64° | 63° | 63° | 63° | 64° | 64° | 66° | 68° | 69° |
| Wind (kts) | 9 | 7 | 6 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 6 | 7 | 9 | 10 | 10 | 11 | 11 | 11 | 11 | 10 |
| Direction | SE | SE | SE | SE | SE | SE | SE | S | S | SW | SW | SW | SW | W | W | NW | NW | NW | NW | N | N | N | N | N |
| Gusts (kts) | 18 | 15 | 13 | 12 | 11 | 10 | 10 | 10 | 10 | 10 | 11 | 11 | 11 | 12 | 12 | 14 | 16 | 17 | 18 | 18 | 18 | 18 | 17 | 16 |
| Precip % | 51% | 39% | 45% | 77% | 88% | 57% | 60% | 33% | 11% | 15% | 23% | 19% | 24% | 41% | 75% | 83% | 68% | 29% | 21% | 12% | 4% | 4% | 3% | 3% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Sun, 3 PM EDT | 70°F | 10 mph SE (135°) | 21 mph | 51% | 88% | Chance Showers And Thunderstorms |
| Sun, 4 PM EDT | 70°F | 8 mph SE (135°) | 17 mph | 39% | 85% | Chance Showers And Thunderstorms |
| Sun, 5 PM EDT | 70°F | 7 mph SE (135°) | 15 mph | 45% | 88% | Chance Showers And Thunderstorms |
| Sun, 6 PM EDT | 70°F | 6 mph SE (135°) | 14 mph | 77% | 89% | Showers And Thunderstorms |
| Sun, 7 PM EDT | 69°F | 5 mph SE (135°) | 13 mph | 88% | 92% | Showers And Thunderstorms |
| Sun, 8 PM EDT | 69°F | 5 mph SE (135°) | 12 mph | 57% | 71% | Showers And Thunderstorms Likely |
| Sun, 9 PM EDT | 69°F | 5 mph SE (135°) | 12 mph | 60% | 78% | Showers And Thunderstorms Likely |
| Sun, 10 PM EDT | 70°F | 5 mph S (180°) | 12 mph | 33% | 61% | Chance Showers And Thunderstorms |
| Sun, 11 PM EDT | 70°F | 5 mph S (180°) | 12 mph | 11% | 40% | Partly Cloudy |
| Mon, 12 AM EDT | 69°F | 5 mph SW (225°) | 12 mph | 15% | 47% | Slight Chance Rain Showers |
| Mon, 1 AM EDT | 68°F | 5 mph SW (225°) | 13 mph | 23% | 47% | Slight Chance Rain Showers |
| Mon, 2 AM EDT | 67°F | 5 mph SW (225°) | 13 mph | 19% | 61% | Slight Chance Rain Showers |
| Mon, 3 AM EDT | 66°F | 5 mph SW (225°) | 13 mph | 24% | 63% | Slight Chance Rain Showers |
| Mon, 4 AM EDT | 65°F | 6 mph W (270°) | 14 mph | 41% | 70% | Chance Rain Showers |
| Mon, 5 AM EDT | 64°F | 7 mph W (270°) | 14 mph | 75% | 84% | Rain Showers |
| Mon, 6 AM EDT | 64°F | 8 mph NW (315°) | 16 mph | 83% | 89% | Rain Showers |
| Mon, 7 AM EDT | 63°F | 10 mph NW (315°) | 18 mph | 68% | 79% | Rain Showers Likely |
| Mon, 8 AM EDT | 63°F | 12 mph NW (315°) | 20 mph | 29% | 86% | Chance Rain Showers |
| Mon, 9 AM EDT | 63°F | 12 mph NW (315°) | 21 mph | 21% | 88% | Slight Chance Rain Showers |
| Mon, 10 AM EDT | 64°F | 13 mph N (0°) | 21 mph | 12% | 87% | Mostly Cloudy |
| Mon, 11 AM EDT | 64°F | 13 mph N (0°) | 21 mph | 4% | 88% | Cloudy |
| Mon, 12 PM EDT | 66°F | 13 mph N (0°) | 21 mph | 4% | 84% | Mostly Cloudy |
| Mon, 1 PM EDT | 68°F | 13 mph N (0°) | 20 mph | 3% | 88% | Cloudy |
| Mon, 2 PM EDT | 69°F | 12 mph N (0°) | 18 mph | 3% | 55% | Partly Sunny |
| Mon, 3 PM EDT | 70°F | 10 mph N (0°) | 17 mph | 2% | 43% | Mostly Sunny |
Official National Weather Service hourly forecast. Showing 10 of 25 hours. Wind arrows point the way the wind is blowing; the compass point and degrees show where it comes from.
| Period | This Afternoon October 11, 2026 | Tonight October 11, 2026 | Columbus Day October 12, 2026 | Monday Night October 12, 2026 | Tuesday October 13, 2026 | Tuesday Night October 13, 2026 | Wednesday October 14, 2026 | Wednesday Night October 14, 2026 | Thursday October 15, 2026 | Thursday Night October 15, 2026 | Friday October 16, 2026 | Friday Night October 16, 2026 | Saturday October 17, 2026 | Saturday Night October 17, 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 70° | 63° | 72° | 58° | 78° | 64° | 84° | 63° | 70° | 58° | 75° | 50° | 59° | 41° |
| Wind | SE 7 to 12 mph | S 7 mph | NW 8 to 13 mph | NW 2 to 6 mph | SW 2 to 6 mph | SW 6 mph | SW 6 mph | NW 2 to 6 mph | N 6 to 9 mph | E 6 mph | S 6 to 14 mph | W 16 mph | NW 16 to 21 mph | NW 12 to 18 mph |
| Gusts | 23 mph | 14 mph | 21 mph | 9 mph | 9 mph | 14 mph | 12 mph | 14 mph | 15 mph | 13 mph | 23 mph | 29 mph | 33 mph | 31 mph |
| Precip % | 51% | 88% | 83% | 1% | 0% | 0% | 2% | 11% | 15% | 28% | 43% | 43% | 22% | 8% |
| Forecast |
Poor for fishing (49/100), from 5 available inputs. Supporting this: Wind 10 mph from the southeast. Sky is overcast (88% cloud cover). The forecast mentions thunderstorms, which carries a risk penalty. Not available from a verified source for this lake: pressure trend, water temperature. Confidence is moderate (74%) because some inputs are unavailable or older than ideal.
Poor for boating (51/100), from 4 available inputs. Supporting this: No active official alerts for this lake. Wind 10 mph from the southeast. The forecast mentions thunderstorms, which carries a risk penalty. Not available from a verified source for this lake: visibility and conditions, verified water access. Confidence is moderate (84%) because some inputs are unavailable or older than ideal.
Fair for sailing (58/100), from 4 available inputs. Supporting this: Wind 10 mph from the SE is in the preferred sailing range. No active official alerts for this lake. The forecast mentions thunderstorms, which carries a risk penalty. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Poor for kayaking (52/100), from 5 available inputs. Supporting this: Wind 10 mph from the southeast. No active official alerts for this lake. The forecast mentions thunderstorms, which carries a risk penalty. Confidence is high (90%).
Water temperature is not available from a verified source for this lake. No swimming score is shown without it.
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Individual boat ramp GPS coordinates are maintained under the jurisdiction of MD Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
St. Mary's Lake is an established freshwater reservoir in MD that supports a vibrant mix of fishing, motorized watercraft, and paddle sports. Seasonal temperature shifts and water fluctuations influence both fish behavior and boating navigation throughout the year. Plan your visit with current USGS water data and official agency guidelines.
Valid freshwater sport fishing license issued by Maryland Department of Natural Resources (MD DNR) is required for anglers age 16+. Digital license on mobile is accepted.
Current motorized watercraft registration mandatory. Practice Clean, Drain & Dry protocols: drain all livewells and inspect props before launching. Life jackets required for all passengers.
Public shoreline and boating access managed by State & Local Authorities. Verify seasonal gate hours, launch fees, and parking rules before travel.
Low-wake cruising, electric-troll fishing craft, and quiet-water exploration. Target gamefish include Common Carp, Black Crappie, Pumpkinseed Sunfish, Largemouth Bass. Morning hours typically provide optimal glassy conditions for kayak and stand-up paddleboard (SUP) touring.
Warm water temperatures, peak swimming, active watersports, and open full-service campgrounds. Highest weekly attendance; plan early arrivals on summer weekends.
Spring pre-spawn and fall feeding transitions create prime trophy angling conditions. Cooler air, lower boat traffic, and vibrant seasonal shoreline foliage.
Mild year-round outdoor climate. Uncrowded waters, active winter bass and crappie fishing, and open year-round boat launch access.
No external source rows are cited by the data currently shown on this page.
Updated
Scores are heuristics, not safety guarantees. LakeRadar scores summarize available conditions and are not a substitute for official warnings, local rules, or on-water judgment.
All telemetry for St. Mary's Lake is synchronized directly from authorized federal and state monitoring networks (USGS, NWS, NOAA, and state environmental authorities). Observations are strictly instrumented readings — unmonitored sensors are transparently disclosed rather than synthetic estimates.
Last source audit: Oct 11, 3:02 PM EDT