First Significant Heat Wave of the Season Begins Sunday

First Significant Heat Wave of the Season Begins Sunday

After a cool May, many people have been questioning when will sustained summer-like weather officially begin? We are happy to say a sustained period of warmer than normal temperatures will begin Sunday and last through at least next Thursday. Beyond that is too far out to say with much confidence that we see above/below normal temps.

Below is a look at our current pattern:

A persistent ridge out west has led to a trough in the east, resulting in a lot of cool and damp days across our state. As we head into the weekend, a rather quick pattern change will take place, virtually swapping the ridge and trough placement.

Next week’s pattern:

BELOW IS OUR PROJECTED TEMPERATURES DURING THE SUNDAY THROUGH THURSDAY TIME PERIOD:

 

AREA A – Sustained high temperatures in the upper 80s to middle 90s. All locations in this area will experience a true heat wave (3 consecutive days of 90+ degree weather).

AREA B – Sustained high temperatures in the middle 80s to 90 degrees. Some locations will experience a true heat wave (3 consecutive days of 90+ degree weather).

AREA C – Sustained high temperatures in the low to middle 80s. A far cry from Tomorrow’s forecast where many areas will struggle to reach 60 degrees!

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Josh Adams is the founder and lead forecaster of Pennsylvania Weather Action, a regional forecasting site he launched in 2015. With over a decade of experience analyzing weather patterns across Pennsylvania, his forecasts have reached millions of readers throughout the state. Josh specializes in Pennsylvania’s complex microclimates and terrain-driven weather patterns, providing detailed coverage of severe thunderstorms, winter storms, and flooding events. His forecasting focuses on delivering precise, timely information to help Pennsylvanians stay informed and prepared during impactful weather. Last Updated: March 10, 2026