Friday and Saturday have seen some fine weather, warmest so far in many cities, over the eastern United States. Temperatures climbed well into the 70s.

Next, cool air dipping south out of Canada will meet rain spreading eastward over the mid-sector to instigate marked shifts in weather over the East and the Midwest beginning on Sunday.

Rainy, colder weather will become widespread by early Monday over Washington, D.C., through New York City in the East and westward to Chicago and Detroit. As of Monday, high temperatures will be 20 to 30 degrees lower than those of Saturday afternoon. In the East, there will be a raw chilling wind off the Atlantic Ocean.

Story by AccuWeather.com Senior Meteorologist Jim Andrews.