Philadelphia rolled into Wednesday, March 11, 2026, under mild, muggy skies that felt more like late spring than early March. Morning temperatures in the mid-50s with partial cloud cover are expected to jump into the mid-to-upper 70s this afternoon, especially inland. Just do not leave the umbrella too far from reach, as a line of showers and thunderstorms could sweep in by evening.
Afternoon Storms Could Be Strong
Forecasters expect highs to climb into the mid-to-upper 70s this afternoon, with a few warmer spots flirting with 79°F. A pre‑frontal trough may spark strong to severe thunderstorms late Wednesday into the evening. Line segments could whip up damaging wind gusts, small hail and even an isolated tornado, according to the National Weather Service Mount Holly.
Yesterday's Fog And The Warmup
Tuesday’s dense fog helped load the region with a warm, humid airmass, setting the stage for today’s unseasonable spike in temperatures, while neighborhoods along the shore stay noticeably cooler. For more on how that soupy start turned into a surge of inland warmth into the 70s, see this look at Philly’s fog bank to June-like heat.
Coastal Waters, Nighttime Gusts And Thursday’s Cold Front
On the water, conditions will get choppy. Small Craft Advisories begin this afternoon for parts of the Atlantic coastal waters and later tonight for the Delaware Bay, with seas building and southerly to southwest gusts around 20 to 30 knots. The same system brings stronger southwest gusts over land tonight and a powerful cold front early Thursday. Behind it, winds swing to the northwest, with gusts potentially topping 30 to 40 mph while temperatures drop sharply, according to the National Weather Service Mount Holly.
How To Plan Your Afternoon
If you are trying to squeeze in a walk, a workout or an early dinner outdoors, the warmer and generally drier afternoon hours are your best bet. Just be ready to pivot quickly, since storms could roll in around the evening commute. Shore-bound residents and boaters should secure loose gear, keep a close eye on marine advisories and be prepared for rougher conditions. Drivers should watch for brief heavy downpours and gusty winds that can cut visibility and make bridges and overpasses slick.
This page will be updated if watches or warnings are issued. Stay weather-aware into Thursday as the front barrels through, temperatures tumble and those northwest winds really start to howl.
