Accuweather Channel Forecast

10 Day Forecast

  • Saturday

    90° / 67°
    Warm and Humid; PM T-Storms 40%
  • Sunday

    71° / 56°
    Mostly Cloudy; Shower/T-storm 70%
  • Monday

    76° / 64°
    Cloudy AM; Partly Sunny PM 20%
  • Tuesday

    86° / 59°
    Partly Sunny and Warmer 0%
  • Wednesday

    81° / 61°
    Sun and Clouds; Nice 20%
  • Thursday

    78° / 63°
    Chance of a Shower or T-storm 30%
  • Friday

    80° / 64°
    Shower or T-Storm Possible 30%
  • Saturday

    77° / 55°
    Shower or T-Storm Possible 30%
  • Sunday

    71° / 53°
    Shower/T-storm Chance; Cooler 30%
  • Monday

    74° / 54°
    Partly Sunny 20%
Weather Forecast Discussion

Unsettled the rest of the weekend as things turn much cooler

Looking mostly dry now Memorial Day and pleasant

TONIGHT: Partly to mostly cloudy and sticky with a shower or t-storm around. Low: 67

SUNDAY: Variable cloudiness with a couple of showers and a t-storm; not as warm but still humid. High: 71

SUNDAY NIGHT: Cloudy with a leftover shower, especially early. Low: 56

***FLASH FLOOD WATCH IN EFFECT FOR BERKS, LEHIGH, NORTHAMPTON, CHESTER, BUCKS, MONTGOMERY, PHILADELPHIA, DELAWARE, WARREN, HUNTERDON, MERCER, BURLINGTON, CAMDEN, AND GLOUCESTER COUNTIES FROM 2 AM TO 10 AM SUNDAY***

It was a very warm and humid Saturday across the region and feeling like the heart of summer as we get set to unofficially start the summer season with the Memorial Day holiday. Things are about to change fairly drastically with our weather the next 24 hours thanks to a backdoor cold front that will be pushing down from New England. High temperatures will fall to much cooler levels for Sunday and we can expect more unsettled conditions with shower and t-storm chances tonight into Sunday. Fortunately, things continue to look drier for Memorial Day Monday and we may even see a decent period of sun by the second part of the day.

Saturday was dry for a lot of locations, but there were a few isolated showers, and even a couple t-storms, that popped up during the afternoon and evening. T-storms generally occurred along the I-95 corridor and south of I-76 and I-276. A mix of sun and clouds was seen otherwise with afternoon high temperatures topping out in the upper 80s for many, and perhaps even a few 90 degree readings. A southwesterly wind flow helped increase dew point values pushing them well into the 60s, certainly south of the Lehigh Valley. This more moisture laden air helped to make things feel more uncomfortable for strenuous outdoor activities.

Early on tonight, a weak surface trough and weak upper level energy combined with fairly warm, humid, and unstable air, may continue to lead to a pop up shower or t-storm. No severe weather is expected, but a heavy downpour and perhaps some wind gusts to 30 miles-per-hour can’t be completely ruled out. Eventually, the loss of daytime heating should allow this initial bout of showers or t-storms to fizzle out. We may see a dry period for a while then working through the nighttime; however, a backdoor cold front will be pushing southward from New England and this front is expected to move into our region getting into the wee hours of Sunday morning. As the front approaches, widely scattered showers and possibly a t-storm are expected to pop back up and we may be contending with some of this around dawn Sunday. Once again, while no severe weather is expected, some heavy downpours, a bit of lightning, and some wind gusts to 30 miles-per-hour, will all be possible. We will need to monitor the potential for flooding as showers and t-storms may move repeatedly over the same areas. It will be a very sticky and mild night with low temperatures only expected to drop into the mid to upper 60s. A few spots may not drop below 70 degrees.

The aforementioned backdoor cold front will continue pushing south and west across the region as we work through Sunday morning. This will likely keep scattered showers and t-storms going for a while working through much of Sunday morning. By Sunday afternoon, a lot of this activity may shut down as the backdoor cold front moves further away to our south and west. Regardless, we can expect a mostly cloudy day, and with an easterly onshore wind flow behind the backdoor cold front, look for high temperatures to struggle to even get much higher than 70 degrees. In fact, it’s very well possible Sunday’s highs occur early in the morning. We may actually see the numbers drop working into the afternoon.

Memorial Day Monday continues to look improved compared to earlier forecasts. We will likely start off cool and cloudy in the morning with perhaps a shower very early. Fortunately, as the day wears on, we expect to see the skies clear a little as our backdoor cold front changes to a warm front and pushes back through moving away to our north and east by the afternoon. Our wind flow will change from the easterly onshore direction to a southwesterly direction. An area of high pressure will also try to slowly build in from the west. This should all help to lead to some drier air which will scour out the clouds during the afternoon. We could see a decent period of sunshine later in the afternoon and this should help to kick high temperatures back up into the mid and upper 70s. A weak cold front approaching from the northwest late in the day could spark a stray shower across the Poconos, but for most of us, things are looking pretty dry now for a good chunk of the Memorial Day holiday. I think it’s a safe bet to say we’ll have plenty of opportunities to be outside for parties.

A large area of high pressure will build in from our northwest for Tuesday and Wednesday leading to sunnier skies, lowering humidity, and warmer temperatures. Tuesday’s high temps may actually climb back into the mid and upper 80s although we expect the dew points to fall back into the 50s courtesy of a dry north breeze. This will be much more tolerable for strenuous outdoor activities compared to Saturday. On Wednesday, with high pressure being centered to our northeast, our wind direction will change to the northeast. This will lead to slightly cooler high temperatures, but still generally in the low 80s. We will have to watch some early season tropical development in the Gulf of Mexico this weekend into next week, as Sub-Tropical Storm Alberto continues lifting northward towards the Gulf Coast. Remnants of Alberto may try to work north into the south-central states, and eventually the Midwest, and tag up with a cold front moving through the Midwest. These features may try to work into our area by the latter half of next week bringing a return to unsettled conditions, but there is still a fair amount of uncertainty in regards to the exact track and evolution of Alberto so stay tuned.

Have a wonderful rest of the holiday weekend, and we remember all of those who gave their lives serving our country!


Interactive Radars

Allentown, PA 18102

74°F

Clear Feels like 74°
  • 3 mph N
  • 79%
  • 67°
  • 29.87 in
  • 5:36 AM
  • 8:22 PM

TONIGHT

56°F
Leftover Shower Early; Cloudy

  • 6 mph ENE
  • 40%
  • 8:22 PM
  • Saturday

    90° / 67°
  • Sunday

    71° / 56°
  • Monday

    76° / 64°
  • Tuesday

    86° / 59°
  • Wednesday

    81° / 61°
  • Thursday

    78° / 63°

Reading, PA 19605

77°F

Feels like 79°
  • 6 mph S
  • 79%
  • 70°
  • 29.87 in
  • 5:38 AM
  • 8:23 PM

TONIGHT

57°F

  • 4 mph E
  • 40%
  • 8:23 PM
  • Saturday

    90° / 68°
  • Sunday

    72° / 57°
  • Monday

    77° / 65°
  • Tuesday

    87° / 60°
  • Wednesday

    82° / 62°
  • Thursday

    79° / 64°

This Week's Circulars

Regional Radar Image

Historical Averages

High Low
Current 90°F 67°F
Average 74°F 52°F
Record 94°F May 27, 1914 38°F May 27, 1972

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