Patchy fog is forecast to start the day Friday, clearing to partly cloudy skies and highs in the upper 80s in the Baltimore area.
Fog was expected through mid-morning, with moderate humidity throughout the day.
Skies are forecast to turn mostly sunny, staying that way Saturday as well. Highs Saturday are forecast around 90 degrees with moderate humidity.
Rain chances are possible overnight Saturday into Sunday, with storms possible Sunday afternoon.
Oppressive humidity and highs around 90 degrees Sunday are expected to combine for heat index values up to the mid-90s.
Storms are also possible to end the long Labor Day weekend on Monday, with more oppressive humidity and highs in the lower 90s.