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

Andover, Aeroflex-Andover Airport (K12N)

Lat: 41.01°NLon: 74.74°WElev: 584ft.

13°C

56°F

Humidity 90%
Wind Speed Calm
Barometer 1016.5 mb (30.03 in)
Dewpoint 12°C (53°F)
Visibility NA
Last update 18 Apr 2:54 am EDT
Extended Forecast for

Hopatcong NJ

  • Overnight

    Overnight: Mostly cloudy, with a low around 12. Calm wind.

    Low: 12 °C

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 18. Southeast wind 10 to 15 km/h.

    High: 18 °C

    Mostly Sunny

  • Saturday Night

    Saturday Night: Showers likely, mainly after 5am. Mostly cloudy, with a low around 6. Southeast wind 5 to 15 km/h. Chance of precipitation is 60%. New precipitation amounts between 2.5 and 5 mm possible.

    Low: 6 °C

    Mostly Cloudy
    then Showers
    Likely

  • Sunday

    Sunday: Showers, mainly before 2pm. High near 12. Northwest wind 15 to 20 km/h, with gusts as high as 35 km/h. Chance of precipitation is 90%. New precipitation amounts between 5 and 7.5 mm possible.

    High: 12 °C

    Showers

  • Sunday Night

    Sunday Night: A chance of showers, mainly before 8pm. Partly cloudy, with a low around 1. West wind 5 to 10 km/h. Chance of precipitation is 30%. New precipitation amounts of less than 1 mm possible.

    Low: 1 °C

    Chance
    Showers

  • Monday

    Monday: A slight chance of showers between 8am and 2pm. Mostly sunny, with a high near 8. Chance of precipitation is 20%.

    High: 8 °C

    Slight Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around -3.

    Low: -3 °C

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 11.

    High: 11 °C

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 4.

    Low: 4 °C

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 12. Calm wind.
Saturday
Mostly sunny, with a high near 18. Southeast wind 10 to 15 km/h.
Saturday Night
Showers likely, mainly after 5am. Mostly cloudy, with a low around 6. Southeast wind 5 to 15 km/h. Chance of precipitation is 60%. New precipitation amounts between 2.5 and 5 mm possible.
Sunday
Showers, mainly before 2pm. High near 12. Northwest wind 15 to 20 km/h, with gusts as high as 35 km/h. Chance of precipitation is 90%. New precipitation amounts between 5 and 7.5 mm possible.
Sunday Night
A chance of showers, mainly before 8pm. Partly cloudy, with a low around 1. West wind 5 to 10 km/h. Chance of precipitation is 30%. New precipitation amounts of less than 1 mm possible.
Monday
A slight chance of showers between 8am and 2pm. Mostly sunny, with a high near 8. Chance of precipitation is 20%.
Monday Night
Mostly clear, with a low around -3.
Tuesday
Sunny, with a high near 11.
Tuesday Night
Partly cloudy, with a low around 4.
Wednesday
Mostly sunny, with a high near 17.
Wednesday Night
Partly cloudy, with a low around 4.
Thursday
Sunny, with a high near 19.
Thursday Night
Partly cloudy, with a low around 7.
Friday
Mostly sunny, with a high near 21.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hopatcong NJ
 40.97°N 74.67°W (Elev. 1030 m)
Last Update:
1:45 am EDT Apr 18, 2026
Forecast Valid:
3am EDT Apr 18, 2026-6pm EDT Apr 24, 2026
 
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