The heat is on — but not for long! The Big Apple is expected to shatter a nearly 85-year-old heat record Wednesday with sunny, summer-like temperatures fit for a day at the beach, meteorologists said. The mercury is forecast to hit a high of 90 degrees in the mid-afternoon — the hottest April 15 on record in the city since 1941, when it reached 87 degrees. “Breaking the record is likely,” AccuWeather Senior Meteorologist Matt Benz said Wednesday morning. “It would be a nice day to go to the