Philadelphia residents can expect a warm and mostly sunny start to the week, with temperatures climbing to a high near 87 degrees today. Calm conditions are anticipated to precede a slight evening breeze picking up from the west at around 5 mph. The balmy weather will carry over into tonight, which is forecasted to be partly cloudy with lows settling at around 62 degrees. Beyond, the city is set for another day of partly sunny skies and high temperatures on Tuesday, according to the National Weather Service.

For those looking to enjoy the outdoor serenity, it might be wise to make the most out of the clear weather, as changes are forecasted to gradually encroach. As per the National Weather Service, Tuesday night will usher in a 30% chance of showers between 8 pm and 11 pm, with mostly cloudy conditions prevailing and lows hovering around 60 degrees. The wind is expected to shift throughout the night, starting from the southwest at 5 mph before turning northeast.

Looking ahead, Wednesday will bring a 40% chance of rain, though the prospective precipitation might account for less than a tenth of an inch. The forecasts point to a partly sunny day with highs around 77 degrees, and the scenario seems likely to extend into the evening, which is predicted to be partly cloudy with lows around 54 degrees. By Thursday, a return to mostly sunny skies is on the cards, with temperatures potentially reaching the 80s.

The remainder of the week and the weekend could see Philadelphia residents keeping an eye to the sky as the chance of showers reemerges. Friday's outlook signals mostly sunny conditions with a high near 78 degrees, giving way to increased cloudiness by nightfall. The weekend is in to potentially take a wetter turn; the possibility of rain hangs at 40% on Saturday and scales back slightly to 30% come Sunday. "A chance of showers," is what the forecast notes, as temperatures decline to a more moderate high near 71 degrees.

In light of these conditions, the NWS has issued a Hazardous Weather Outlook for Philadelphia County, urging residents to stay informed on potential weather hazards by visiting the official website for updates. Spotters are encouraged to report significant weather conditions through the proper channels.