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Autumnal equinox is set to arrive
this Wednesday 9/22 at 3:20pm…

Southeast PA Forecast

Our southeast PA forecast region includes Philadelphia, Doylestown, West Chester, Lancaster, York, Gettysburg & surrounding areas. Forecasts are updated daily M-F and Saturday that covers both weekend days – not Sunday. 

High pressure remains in control early in the week, then a midweek cold front brings rain, cooler temperatures…

Another mostly sunny day is expected on Monday, with slightly warmer than average temperatures maintaining. A clear to partly cloudy night follows, with areas of patchy fog possible in the valley locations late at night.

A partly to mostly cloudy day follows for Tuesday as high pressure moves into the Gulf of Maine, and an onshore flow develops. The next cold front approaches later Wednesday, and scattered showers during the day will evolve into steady periods of rain during the evening hours…the threat of which extends into the overnight. Autumn will officially arrive on Wednesday at 3:20pm. This is rather fitting, as a front on the lead of a rather deep trough will keep temperatures in the lower 70s for highs Thursday with the scattered showers threat continuing, and slightly below average temperatures are expected Friday through next weekend with mostly sunny skies maintaining.

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Forecaster: Martrich 20 September 0300z

Daily climatology for Philadelphia, PA

Average highAverage lowRecord high temp (year)Record low temp (year)
78°F60°F90°F (1983)45°F (1979)