Warm air has moved over the Baltimore region, expected to bring highs to around 80 degrees and possible showers or storms Thursday, according to the National Weather Service.
Overnight lows were expected in the mid- to upper-60s.
Cloud cover is expected for most of the day, with about a 30 percent chance of showers during the day and thunderstorms in the afternoon and evening.
Some clearing is expected Friday, with partly cloudy skies and highs again around 80 degrees.
Temperatures are forecast to be slightly cooler for the Preakness on Saturday, though precipitation that meteorologists were expecting is predicted to stay south of the area in Virginia. Highs Saturday are forecast in the lower 70s under mostly cloudy skies.
Some shower chances could arise again late Sunday into Monday, with temperatures remaining between the lower 60s and lower 70s.