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Official National Weather Service (NWS) point forecast and real-time wind conditions for St. Mary's Lake (Maryland). 24-hour hour-by-hour wind timelines, peak gusts, watercraft recreation safety thresholds, and 7-day marine outlook.
Today: High 73°F · Low 58°F
Peak gusts: 6 mph · Lake surface chop expected
Humidity: 60% · Barometer: 29.90 inHg
USGS water monitoring available for St. Mary's Lake.
Excellent for boating (99/100), from 4 available inputs. Supporting this: Wind 2 mph from the west. Gusts to 4 mph. 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.
Good for fishing (84/100), from 5 available inputs. Supporting this: Wind 2 mph from the west. 0% chance of precipitation. 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.
Excellent for kayaking (99/100), from 5 available inputs. Supporting this: Wind 2 mph from the west. Gusts to 4 mph. Confidence is high (90%).
Water temperature is not available from a verified source for this lake. No swimming score is shown without it. Supporting this: No active official alerts for this lake. 0% chance of precipitation. Not available from a verified source for this lake: water temperature.
| Time | Air Temp | Wind (mph) | Direction | Peak Gusts | Rain Chance | Sky & Conditions |
|---|---|---|---|---|---|---|
| 12 PM | 70°F | 2 mph | W | ⚡ 4 mph | 0% | Mostly Cloudy |
| 1 PM | 71°F | 3 mph | W | ⚡ 5 mph | 0% | Mostly Cloudy |
| 2 PM | 72°F | 3 mph | W | ⚡ 6 mph | 0% | Mostly Cloudy |
| 3 PM | 72°F | 3 mph | W | ⚡ 6 mph | 0% | Partly Sunny |
| 4 PM | 73°F | 3 mph | W | ⚡ 5 mph | 0% | Mostly Cloudy |
| 5 PM | 71°F | 2 mph | W | ⚡ 5 mph | 0% | Mostly Cloudy |
| 6 PM | 69°F | 2 mph | W | ⚡ 4 mph | 0% | Mostly Cloudy |
| 7 PM | 66°F | 1 mph | SW | ⚡ 4 mph | 0% | Mostly Cloudy |
| 8 PM | 63°F | 1 mph | SW | ⚡ 4 mph | 0% | Mostly Cloudy |
| 9 PM | 62°F | 1 mph | S | ⚡ 4 mph | 0% | Mostly Cloudy |
| 10 PM | 62°F | 1 mph | N | ⚡ 4 mph | 1% | Mostly Cloudy |
| 11 PM | 61°F | 1 mph | NE | ⚡ 4 mph | 1% | Mostly Cloudy |
| 12 AM | 61°F | 1 mph | N | ⚡ 4 mph | 1% | Mostly Cloudy |
| 1 AM | 61°F | 1 mph | NE | ⚡ 4 mph | 1% | Mostly Cloudy |
| 2 AM | 60°F | 1 mph | N | ⚡ 5 mph | 1% | Mostly Cloudy |
| 3 AM | 59°F | 2 mph | NE | ⚡ 5 mph | 1% | Mostly Cloudy |
| 4 AM | 59°F | 2 mph | NE | ⚡ 6 mph | 1% | Mostly Cloudy |
| 5 AM | 58°F | 2 mph | NE | ⚡ 7 mph | 1% | Mostly Cloudy |
| 6 AM | 58°F | 3 mph | E | ⚡ 7 mph | 1% | Mostly Cloudy |
| 7 AM | 58°F | 3 mph | E | ⚡ 7 mph | 1% | Mostly Cloudy |
| 8 AM | 59°F | 3 mph | E | ⚡ 8 mph | 0% | Mostly Cloudy |
| 9 AM | 61°F | 5 mph | E | ⚡ 9 mph | 0% | Mostly Cloudy |
| 10 AM | 64°F | 6 mph | E | ⚡ 10 mph | 0% | Mostly Cloudy |
| 11 AM | 66°F | 7 mph | E | ⚡ 12 mph | 0% | Mostly Cloudy |
Mirror-like to gentle rippled water. Optimal conditions for paddleboarding, kayaking, swimming, and beginner water skiing or wakeboarding.
Pleasant breeze with small wavelets. Great for sailing, pleasure cruising, pontoon boats, and trolling for trout and bass.
Moderate waves with whitecaps likely. Requires skilled boat handling; kayaks, canoes, and stand-up paddleboards should stay close to sheltered bays.
Steep waves, cold spray, and hazardous open water. Avoid small craft voyages. Always check official National Weather Service lake wind advisories.
Mostly cloudy, with a high near 73. West wind around 3 mph.
Mostly cloudy, with a low around 58. Northeast wind around 2 mph.
Mostly cloudy, with a high near 71. East wind 3 to 8 mph.
Rain showers after 8pm. Cloudy, with a low around 62. East wind 7 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Rain showers before 5pm, then showers and thunderstorms. Cloudy, with a high near 71. East wind 12 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.
Showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 80%.
A chance of showers and thunderstorms before 2pm. Partly sunny, with a high near 73. Chance of precipitation is 40%.
Partly cloudy, with a low around 60.
Mostly sunny, with a high near 76.
A slight chance of rain showers between 8pm and 2am. Mostly clear, with a low around 59. Chance of precipitation is 20%.
Sunny, with a high near 70.
Mostly clear, with a low around 56.
Sunny, with a high near 66.
Partly cloudy, with a low around 56.
St. Mary's Lake currently reports 68°F with wind velocity near 2 mph from the W. Atmospheric forecasts and 24-hour hour-by-hour wind timelines are updated hourly from the National Weather Service gridpoint matching the lake's coordinates.
At St. Mary's Lake and surrounding mountain valleys, diurnal heating of the surrounding terrain causes strong thermal pressure differentials known locally as afternoon breezes (such as the Washoe Zephyr at Lake Tahoe). Wind speeds typically peak between 1:00 PM and 5:00 PM before calming near sunset.
For stand-up paddleboarding (SUP), canoeing, and light kayaks, winds under 7 mph (light breeze) offer the safest, glassiest surface conditions. Between 8–14 mph, small wavelets develop, suitable for sailboats and powerboats. Winds exceeding 15 mph create steep whitecaps and rapid drift; winds over 21 mph warrant small craft warnings.
All weather and wind telemetry is fetched directly from the National Weather Service (NOAA - WFO LWX) high-resolution numerical point-forecast API. LakeRadar uses the official gridpoint for St. Mary's Lake without artificial smoothing or third-party estimates.
Yes. Live hydrological sensor readings, 30-day elevation histories, full-pool benchmarks, and USGS station provenance are available on our dedicated St. Mary's Lake Water Level & Temperature page.
View St. Mary's Lake Water Level & Temperature →