Labor Day weather forecast for Lehigh Valley: Clear skies as August temperatures reach lowest in 25 years

The Lehigh Valley can look forward to mostly clear skies and moderate temperatures this Labor Day , marking an abnormally cooler period than usual this time of year.

The forecast for this week is mostly sunny with highs just around 80 degrees until Wednesday, according to the National Weather Service. Later in the week, there’s a chance of rain Thursday night and Friday. Low temperatures for the whole week will primarily be around the mid to high 50s.

The weather service previously reported that the region’s normal high for this time of year is about 85 degrees and the low is about 63 degrees.

The weather service said that the morning low on Saturday in Allentown was 46 degrees, the coolest temperature observed in August since 2000, while some places in the Poconos dipped into the 30s early Sunday.

Even with the cooler weather, the weather service recommended protecting against ultraviolet rays from the sun by applying sunscreen with an SPF of at least 15, wearing hats and sunglasses and finding shade for those celebrating the holiday outdoors.

Here is the extended forecast from the National Weather Service:

Sunday: Sunny, with a high near 78. Calm wind becoming northeast around 5 mph in the afternoon.

Sunday night: Mostly cloudy, with a low around 54. Calm wind.

Labor Day: Mostly sunny, with a high near 79. Calm wind becoming northeast around 5 mph in the morning.

Monday night: Mostly clear, with a low around 54. East wind around 5 mph becoming calm.

Tuesday: Sunny, with a high near 79. Calm wind becoming northeast around 5 mph.

Tuesday night: Mostly clear, with a low around 55.

Wednesday: Mostly sunny, with a high near 81.

Wednesday night: Partly cloudy, with a low around 59.

Thursday: A chance of showers after 2 p.m. Partly sunny, with a high near 80. Chance of precipitation is 30%.

Thursday night: Showers likely, mainly after 2am. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.

Friday: Showers likely. Mostly cloudy, with a high near 75. Chance of precipitation is 60%.

Friday night: Showers likely. Partly cloudy, with a low around 54. Chance of precipitation is 60%.

Saturday: Sunny, with a high near 76.

https://www.mcall.com/2025/08/31/allentown-weather-labor-day-forecast/