LOCAL WEATHER Lake and Air Temperature at Deep Creek Lake, MD Our gauge measures the surface temperature and ambient air temperature towards the North end of Deep Creek Lake. Our sensor is closer to the surface of the water in the off-season so temperatures may vary. CURRENT WEATHER mchenry weather forecast LOCAL RADAR The most reliable forecast for the Garrett County and Deep Creek Lake, MD areas, we’ve found, to be the National Weather Service. Click on the “7-Day Forecast” button below to see more. 7 Day Forecast - National Weather Service