Swampy Heat And Pop-Up Storms Barrel Into Philly This Week

Philadelphia rolled into Wednesday, June 10 under a blanket of mostly cloudy, muggy air, with temperatures hovering near 70°F and dew points around 62°F. Scattered showers and thunderstorms are likely by later today, and forecasters have already hoisted a Heat Advisory for Thursday and Friday, June 11 and 12.

Afternoon Storms And Late-Week Heat

Scattered showers and thunderstorms are expected to fire up by mid-to-late afternoon on Wednesday, June 10, with the main window roughly 4 to 10 p.m. The stronger cells could dump brief heavy rain and kick up isolated damaging wind gusts that may slow the evening commute.

A Heat Advisory is in effect from 11 a.m. on Thursday, June 11 through 8 p.m. on Friday, June 12, with highs climbing into the mid 90s and heat index values pushing about 100 to 104°F in many inland neighborhoods. While the severe storm risk today is limited, the combo of intense heat and humidity later this week raises the risk of heat-related illness, especially for older adults and people working outdoors. For full forecast details and the advisory map, see the National Weather Service.

How To Stay Cool

If you do not have air conditioning, the city wants you planning ahead. Officials recommend using libraries, rec centers and spraygrounds during heat events, and signing up for ReadyPhiladelphia alerts. Hydrate with plenty of water, ease up on heavy outdoor work during the hottest hours, and check in on neighbors who are elderly or live alone. For a list of cooling sites and more tips, see the City of Philadelphia.

Marine And Weekend Outlook

On the water, boaters should keep an eye on strengthening southerly winds and a Small Craft Advisory for offshore waters this afternoon into tonight. At the shore, increasing surf may bring a moderate rip current risk for beachgoers.

The pattern looks to trend drier over the weekend, with highs easing back into the low 90s, though isolated storms could sneak back early next week. For more context on this developing hot stretch, read our look at Philly's sizzling heat run.