Philadelphia is seeing a sunny Saturday afternoon after patchy frost before 10 a.m. Temperatures are headed toward a high near 65 degrees. Winds will stay calm, and rain is not expected. The National Weather Service forecast calls for sunshine and a high near 65.
Frost Gives Way To A Sunny Afternoon
Saturday's high is expected to reach about 65 degrees. The National Weather Service forecast puts the high near 65.
Saturday night will bring another round of patchy frost after 10 p.m. Skies will remain clear, winds will be nearly calm, and overnight lows across much of the area are forecast in the upper 20s to mid-30s, so gardeners may want to cover tender plants again.
Forecast lows in the upper 20s to mid-30s can still accompany patchy frost: frost forms when ground-level surfaces cool below 32 degrees, and the National Weather Service notes it often occurs even when thermometer-level air is in the mid-30s. Clear skies and calm winds can favor that cooling, making tender plants more vulnerable than the overnight air-temperature number alone might suggest. The NWS frost glossary explains why frost can form in those conditions.
The National Weather Service’s Frost Advisory for Philadelphia County ran through 9 a.m. Saturday and has expired; its forecast still calls for patchy frost after 10 p.m. tonight. The advisory’s end time does not rule out another frosty night, but the current advisory window does not cover tonight. The NWS Philadelphia forecast and hazard listing show both the advisory timing and the overnight frost forecast.
Warm-Up Builds Through Monday
Sunday looks much like Saturday, with early frost followed by sunshine and a high near 68 degrees. Monday will be the warmest day of the stretch, reaching about 70 under clear skies, before temperatures reach about 64 Tuesday. The National Weather Service forecast calls for Sunday’s high near 68, Monday’s near 70 and Tuesday’s near 64.
The extended outlook remains mostly dry through Friday, with highs near 65 Wednesday, 69 Thursday and 71 Friday. For Philadelphia, the week ahead offers crisp mornings, mild afternoons and very little reason to check the umbrella by the door. The National Weather Service forecast lists highs near 65 Wednesday, 69 Thursday and 71 Friday.
