'Heat wave'? No, but record hit in Philly

A pedestrian walks across Spring Garden Street on Second Street, as the sun sets on Monday, April 8, 2013. ( Yong Kim / Staff Photographer )

Perhaps it's not a heat wave — by summer standards, anyway — but the temperature in Philadelphia hit the all-time high of 84 degrees for the date, according to the National Weather Service.

The peak was recorded at 4:54 p.m., matching the highest temperature ever recorded for April 9 set back in 1991 and 1959.

Tomorrow is going to be another unseasonably warm (is it too early to use the word hot?) day, according to National Weather Service meteorologist Mark DeLisi. He said it is "possible" that temperatures could approach Philadelphia's record for April 10, which is 87 degrees set back in 1942.

He did stress that despite the notable temperatures for spring in April, it's not time to bring out a term meteorologists commonly use in the throes of a steamy summer stretch.

"This is definitely some warm air came up from the south. It’s not a heat wave," DeLisi said. "It’s unusual for this time of year, but not a heat wave."

The reason for a couple of days in the 80s? DeLisi said conditions were right for very warm air to flow into the region from the South.

The National Weather Service is predicting a high of 83 tomorrow afternoon, followed by rain showers in the late afternoon or evening. The rain will then likely continue Thursday evening and Friday, cooling off the region, the NWS forecast says. By Friday, temperatures are expected to drop back into the 60s.

Contact Brian X. McCrone at 215-854-2267 or bmccrone@philly.com. Follow @brianxmccrone on Twitter.

Contact the Breaking News Desk at 215-854-2443; BreakingNewsDesk@philly.com. Follow @phillynews on Twitter.