Weather Service: Extended forecast ‘screams excessive heat’ in Lehigh Valley


High temperatures in the Lehigh Valley will begin to climb well above normal for the next few days, and the National Weather Service says Monday’s forecast ‘screams excessive heat’, with indices near or above 100 degrees for much of the region.

Signals indicate early next week will mark our first day with temperatures above 90 since Sept. 27, 2017, when the temperature hit 91 at Lehigh Valley International Airport. It’s likely to feel even warmer than our last day in the mid 90s — July 20, 2017 — when the temperature soared to 94 degrees in Allentown.

The weather service says Monday’s forecast ‘is not a slam dunk forecast, to say the least’ but it’s really looking downright unpleasant. Highs are expected to be well into the 90s with dew points in the 70s. If forecast trends continue, heat products will likely be required.

If Monday’s predicted high of 95 is reached, it would be roughly 15 degrees above normal value. It would also tie the record high for the date set back in 1957.

Before we get to Monday, the weather service says temperatures will continue to trend up straight through Father’s Day weekend.

The forecast looks straightforward today through Saturday, with dry conditions and mostly sunny skies expected at least through the beginning of the weekend. Some models hint at precipitation in the area late Saturday, especially north and west of Philadelphia, so it hasn’t been ruled out completely.

The Sunday temperature forecast remains a challenge, meteorologists say, with precipitation and cloud cover possibly factoring in to expected highs. The weather service is going above guidance, bringing maximum temperatures close to 90 for much of the area away from the coast. Dew points will also be increasing during this period, so heat indices will approach or exceed 90 on Father’s Day.

Excessive Heat Preparedness

When temperatures rise to uncomfortable levels, the weather service says its best advice is to drink plenty of fluids, stay out of the sun, and in an air-conditioned place.

If you work or spend time outside, take extra precautions, such as frequent rest breaks in shaded or air conditioned locations. Also wear clothing that is light weight and loose fitting. If possible, reschedule strenuous activities for the early morning or evening, when cooler temperatures prevail.

In excessive heat, car interiors can reach deadly temperatures in a matter of minutes during hot or warm weather. Never leave young children and pets unattended in vehicles.

For more preparedness information, including the signs and symptoms of heat exhaustion and heat stroke, visit the NWS Heat Safety Website

Here is the extended Lehigh Valley forecast from the National Weather Service:


Sunny, with a high near 82. West wind 9 to 16 mph, with gusts as high as 28 mph.


Mostly clear, with a low around 57. Northwest wind 7 to 10 mph.


Sunny, with a high near 79. North wind around 11 mph.

Friday Night

Mostly clear, with a low around 56. North wind 3 to 6 mph.


Sunny, with a high near 85. Calm wind becoming west around 5 mph in the afternoon.

Saturday Night

Partly cloudy, with a low around 62.


Mostly sunny, with a high near 89.

Sunday Night

Mostly cloudy, with a low around 72.


Mostly sunny, with a high near 95.

Monday Night

Partly cloudy, with a low around 73.


A chance of showers and thunderstorms. Partly sunny, with a high near 84. Chance of precipitation is 50%.

Tuesday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 40%.


A chance of showers and thunderstorms. Partly sunny, with a high near 81. Chance of precipitation is 40%.

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2018-06-14 10:45:44

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