While Sunday featured rising temperatures, even warmer air will reach Harrisburg on Memorial Day.
Temperatures will once again soar on Memorial Day, exceeding Sunday's high and and reaching a high in the middle 80s.
Humidity will also stay low and prevent the holiday from feeling muggy.
The other good news for those attending memorial ceremonies, picnics, concerts and parades on Monday is that thunderstorms streaming into northern New England will stay well to the north of the city.
However, sunscreen is encouraged for anyone outside for extended periods of time.
Those planning to spend some time on the river or area lakes should not be fooled by the warm air temperatures. Water temperatures remain on the chilly side and may be dangerous to enter.
With water this cool, there is a risk of cold water shock for both swimmers and boaters who accidentally fall overboard (another reason why life jackets should always be worn on boats).
Showers and drenching thunderstorms will return on Tuesday as the warmth hangs on and humidity increases.
AccuWeather.com MinuteCast™ has the minute-by-minute forecast for your exact location when showers and thunderstorms threaten. Type your city name, select MinuteCast™, and input your street address. On mobile, you can also use your GPS location.
An end to the early taste of summer will come by Wednesday as cooler air arrives.
AccuWeather.com Meteorologist Jordan Root contributed to the content of this story.
Temperatures will take a tumble across the northeastern United States during the first half of this week.
Beneficial rain will douse California late this week, with the potential for some rain to reach southern portions of the state.
Following a chilly World Series opener during Tuesday evening, a chilly rain may threaten play for Game 2 in Cleveland on Wednesday evening.
A strengthening tropical cyclone will unleash heavy rain and strong winds on areas from western Myanmar to northeast India and Bangladesh this week.
Cool air that has been in place across the United Kingdom over the past week will be replaced with milder air by the middle of the week.
Flooding downpours and thunderstorms will target a part of the central United States at midweek.
Tornado sweeps through Sunset Crater National monument. 600-700 trees destroyed. The twister was 150 yards wide at times.
New England (1785)
Four day rains put Merrimac River in NH and MA to greatest flood height ever known -- extensive bridge and mill damage.
Mid-Atlantic Coast (1878)
Hurricane did extensive damage in NC, VA, MD, NJ and PA. "Philadelphia's worst" -- 84 mph wind gust at Cape May, NJ; 28.82" pressure at Annapolis, MD.