National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Significant Heat in the Northwest U.S.; Tropical Rainfall Potential in the Southwest U.S.

A significant late season heat wave continues in the interior Pacific Northwest for at least one more day before easing somewhat Friday into Saturday. A combination of monsoonal moisture and tropical moisture ahead of tropical cyclone Lorena will bring a marginal to slight risk of excessive rainfall across the southwest U.S. through Saturday which may bring areas of flooding. Read More >

Current conditions at

Andover, Aeroflex-Andover Airport (K12N)

Lat: 41.01°NLon: 74.74°WElev: 584ft.

66°F

19°C

Humidity 84%
Wind Speed Vrbl 3 mph
Barometer 29.90 in (1011.9 mb)
Dewpoint 61°F (16°C)
Visibility NA
Last update 4 Sep 8:54 am EDT
Extended Forecast for

Portland PA

  • Today

    Today: A chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 82. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 82 °F

    Partly Sunny
    then Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms before 1am, then a chance of showers between 1am and 2am. Low around 61. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 61 °F

    Showers then
    Chance
    Showers

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 83. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 83 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Mostly clear, with a low around 62. Calm wind.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 84. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 84 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 55 °F

    Showers
    Likely

  • Sunday

    Sunday: A chance of showers before 8am. Mostly sunny, with a high near 74. Chance of precipitation is 30%.

    High: 74 °F

    Chance
    Showers then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 49.

    Low: 49 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 82. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms before 1am, then a chance of showers between 1am and 2am. Low around 61. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 83. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 62. Calm wind.
Saturday
A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 84. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
A chance of showers before 8am. Mostly sunny, with a high near 74. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 49.
Monday
Sunny, with a high near 72.
Monday Night
Mostly clear, with a low around 46.
Tuesday
Sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 48.
Wednesday
Mostly sunny, with a high near 76.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portland PA
 40.93°N 75.11°W (Elev. 522 ft)
Last Update:
8:22 am EDT Sep 4, 2025
Forecast Valid:
9am EDT Sep 4, 2025-6pm EDT Sep 10, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation