The 10-day span for Chalfont runs from a high near 88° on Thursday down to 57° overnight on Monday. Models drop roughly 1.7 in of precipitation across the stretch — watch Tuesday (86%). The NWS alert board for this area is currently clear. Right now Chalfont is about 17° cooler than nearby Washington. Longer view: classic Northeast mix — nor'easters, humid spells and a glorious fall.
Chalfont, PA · Elev 285 ft · 40.29°N, 75.21°W · Pennsylvania · Forecast computed for these exact coordinates