Summer forecast 2026: AccuWeather is predicting the number of 90-degree days to be near or above the historical average in Boston, Chicago, New York City and Philadelphia.⁣ ⁣ In the Northeast, there could be a "late surge of heat and higher humidity," according to AccuWeather Long-Range Expert Paul Pastelok. The added humidity will boost AccuWeather RealFeel® Temperatures during the day and contribute to warmer nights.⁣ ⁣ Tap the link in bio for AccuWeather's full summer forecast.