Philadelphia is starting Monday, August 10, with mostly clear skies and temperatures in the mid-70s, but the calm morning is a setup for a hotter, stormier afternoon. Highs should reach about 95 degrees, and showers and thunderstorms become likely after 1 p.m. The most favorable window for storms is midafternoon through early evening, when some storms could bring damaging wind gusts and a quick burst of heavy rain.
Storm Threat Builds After Lunch
The hourly forecast keeps skies mostly sunny through early afternoon, with temperatures climbing into the lower and mid-90s. Rain chances rise from about 15% around 1 p.m. to 60% by 5 p.m., and storms may continue into Monday night before easing before midnight. The National Weather Service says the main concern is damaging wind, though localized flash flooding is also possible where downpours hit hard.
Hot, Humid Start To The Week
Monday night's low should settle near 74 degrees under partly cloudy skies. Tuesday remains mostly sunny, with a high around 91 and a 30% chance of afternoon storms, while another round of showers or storms could linger Tuesday night. Wednesday stays warm near 88 with a 40% rain chance, so the umbrella may get more than one shift this week.
Relief Arrives Friday
Thursday remains seasonably hot near 89 degrees with a few storm chances, but the pattern changes by Friday. Mostly sunny skies and a high near 86 should arrive with a drier, cooler air mass, followed by a low around 66 Friday night. Saturday looks mostly sunny near 85, while Sunday brings a chance of showers and a high near 86.
River And Coastal Flooding Could Nudge Higher
The weather service is also watching evening high tides this week along the tidal Delaware River, Delaware Bay and Atlantic coast. Minor tidal flooding is most possible Tuesday and Wednesday as tides rise near flood stage, although no coastal flood advisory is currently in effect. People near low-lying riverfront areas should check updated forecasts before traveling or parking near the water.
What To Know Before Heading Out
Outdoor plans may be manageable Monday morning, but conditions could turn quickly later in the day. Bring shelter indoors before storms arrive, secure loose outdoor items and never drive through water covering a roadway. Anyone caught outside when thunder develops should move inside promptly, as the strongest storms may produce dangerous wind.
