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

Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Current conditions at

Andover, Aeroflex-Andover Airport (K12N)

Lat: 41.01°NLon: 74.74°WElev: 584ft.

73°F

23°C

Humidity 90%
Wind Speed Vrbl 5 mph
Barometer 29.96 in (1013.5 mb)
Dewpoint 70°F (21°C)
Visibility NA
Last update 17 Aug 9:54 am EDT
Extended Forecast for

Lake Hopatcong NJ

  • Today

    Today: Mostly sunny, with a high near 89. Southwest wind 5 to 10 mph.

    High: 89 °F

    Mostly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 62. Northwest wind 5 to 10 mph becoming north in the evening. 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.

    Low: 62 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 73. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 73 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers, mainly before 8pm. Mostly cloudy, with a low around 59. East wind around 5 mph becoming calm. Chance of precipitation is 30%.

    Low: 59 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers after 2pm. Partly sunny, with a high near 74. East wind around 5 mph. Chance of precipitation is 20%.

    High: 74 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms, then a chance of showers after 2am. Mostly cloudy, with a low around 60. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 60 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers. Mostly cloudy, with a high near 76. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 60. Chance of precipitation is 40%.

    Low: 60 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers after 2pm. Mostly sunny, with a high near 79. Chance of precipitation is 30%.

    High: 79 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 89. Southwest wind 5 to 10 mph.
Tonight
A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 62. Northwest wind 5 to 10 mph becoming north in the evening. 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.
Monday
A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 73. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Monday Night
A chance of showers, mainly before 8pm. Mostly cloudy, with a low around 59. East wind around 5 mph becoming calm. Chance of precipitation is 30%.
Tuesday
A slight chance of showers after 2pm. Partly sunny, with a high near 74. East wind around 5 mph. Chance of precipitation is 20%.
Tuesday Night
A slight chance of showers and thunderstorms, then a chance of showers after 2am. Mostly cloudy, with a low around 60. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A chance of showers. Mostly cloudy, with a high near 76. Chance of precipitation is 40%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 60. Chance of precipitation is 40%.
Thursday
A chance of showers after 2pm. Mostly sunny, with a high near 79. Chance of precipitation is 30%.
Thursday Night
A chance of showers before 8pm. Partly cloudy, with a low around 58. Chance of precipitation is 30%.
Friday
Sunny, with a high near 82.
Friday Night
Mostly clear, with a low around 61.
Saturday
Mostly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lake Hopatcong NJ
 40.96°N 74.61°W (Elev. 984 ft)
Last Update:
4:22 am EDT Aug 17, 2025
Forecast Valid:
10am EDT Aug 17, 2025-6pm EDT Aug 23, 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