Temperatures at 1030 p.m. range from the mid 60s to the lower 70s. Dew points are in the mid 50s, making for a very comfortable August night on the bay. Overnight we can expect tranquil conditions with some high cloudiness moving in overhead, especially over the southern bay. Minimums will not be as cool as last night, but some of the cooler locations may drop down into the mid 50s. Most locations near the bay will be in the upper 50s to lower 60s by sunrise. During the day on Saturday, cloudiness will gradually increase throughout the day but precipitation should hold off in the Annapolis area until late afternoon or early evening. The clouds wild hold temperatures down during the day with anticipated highs only in the mid 70s. More widespread showers will develop across the region late Saturday into Sunday. Rainfall is not expected to be all that heavy, but the showers and clouds will keep Sunday's highs only in the low 70s. Showers and thundershowers may persist into Monday, to be followed by a warmer and more humid pattern with highs next week back in the mid to upper 80s.
On the Maryland portion of Chesapeake Bay, there are no advisories currently in effect. Winds overnight will shift from the southeast to the northeast at less than 10 miles per hour with wave heights of less than one foot. On Saturday, plan for an east wind of 10 miles per hour or less with wave heights again one foot or less. Marine weather information is provided only as a guide. Boaters should always stay tuned to the latest forecasts and advisories from the National Weather Service.
The average high temperature for August 17 is 85 degrees and the average low is 65. The records at Baltimore on this date are 100 degrees in 1997 and 53 degrees in 1979. Weather data courtesy of the National Weather Service. For more weather updates, please visit my Chesapeake Bay Weather page on Facebook, and if you're heading to Ocean City feel free to check out my Ocean City MD Weather page on Facebook. You can also follow me on Twitter @chesbayweather.