Allentown is forecast to warm from near 40 degrees Tuesday morning, Nov. 3, to about 70 in the afternoon as skies become mostly sunny. The supplied forecast also calls for light southwest winds and little chance of rain Tuesday. Its source was not provided, so these forecast details have not been independently verified here.
Fog and rain in the forecast
Patchy fog could develop after midnight Tuesday, with a low near 47, and areas of fog are possible Wednesday morning before a forecast high near 73. Rain is expected to become more likely Thursday, Nov. 5: the supplied forecast gives a 70% chance beginning after 7 a.m., with more rain possible Thursday night and a slight chance of thunderstorms. It estimates a quarter to half an inch of rain. The forecast also calls for rain Friday, followed by mostly sunny, cooler conditions over the weekend and another chance of rain Monday. These are forecast figures, not observed outcomes; the source needed to verify them was not included.
Statewide context, not a local forecast
Pennsylvania’s Department of Environmental Protection says the state’s climate has become wetter, with average precipitation increasing 10%. That statewide trend provides broader context, but does not establish what is causing the rain in this forecast or how much will fall in Allentown.
A separate Lehigh Valley rain event
A historical comparison illustrates that heavy rain has affected the region before, but does not predict what will happen this week. The National Weather Service Philadelphia/Mount Holly review says a separate event on Nov. 2–3, 2018, brought widespread heavy rain to much of the Lehigh Valley, with several reports of overnight flash flooding. That event’s documented impacts are not evidence of a flood threat from the current forecast; its outcomes remain unknown.
