Temperatures will likely reach the 90s again Wednesday in the Lehigh Valley before a cold front brings showers and possibly thunderstorms to the region.
A high of 90 is expected Wednesday after two near-record warm days in the Lehigh Valley, according to the National Weather Service in Mount Holly, New Jersey. Temperatures will drop into the 50s and 60s over the next few days before reaching the 70s for the Memorial Day holiday, forecasters said.
Showers and thunderstorms are possible Wednesday afternoon and evening. The storms could produce damaging wind gusts, heavy downpour and frequent lightning, according to the weather service.
Up to half an inch of rain could fall. The Lehigh Valley is under a slight risk of severe weather.
Confidence is increasing in some severe thunderstorms moving through later today. The main threat is damaging wind gusts, with storms beginning to develop and move in after 2 PM. Make sure you have ways to receive any warnings! And when thunder roars, go indoors! pic.twitter.com/c4TBQxmXw6
— NWS Mount Holly (@NWS_MountHolly) May 20, 2026
The next few days will mark a significant departure from the summer-like heat felt in the Lehigh Valley. On Wednesday, authorities announced that two men in Lehigh County died from the extreme heat conditions this week.
A high of 94 was recorded Monday and Tuesday, marking the warmest days of the month. Temperatures were a few degrees below the records for those days, according to weather service data.
The record highs were set on May 18, 1962, at 96, and May 19, 1962, at 97. The record high for May 20 was tied in 1962 and 1996 at 92, so Wednesday’s expected high could be close to the record. The Lehigh Valley remains under a heat advisory until 8 p.m.
Rain is possible every day through next Tuesday. Here is the extended forecast from the National Weather Service:
Thursday: Showers likely, mainly before 9 a.m. Cloudy, with a high near 68. Northeast wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday: A chance of showers after 2 p.m. Mostly cloudy, with a high near 66. East wind around 5 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Saturday: Showers. High near 57. Chance of precipitation is 90%.
Sunday: Showers likely before 2 p.m. Cloudy, with a high near 65. Chance of precipitation is 60%.
Monday: A chance of showers. Mostly cloudy, with a high near 74. Chance of precipitation is 40%.
Tuesday: A chance of showers. Partly sunny, with a high near 79. Chance of precipitation is 30%.