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

Monticello, Sullivan County International Airport (KMSV)

Lat: 41.7°NLon: 74.8°WElev: 1404ft.

Fair

59°F

15°C

Humidity 93%
Wind Speed Calm
Barometer 29.97 in (1014.1 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 19 Aug 12:56 am EDT
Extended Forecast for

Upper Mongaup NY

  • Overnight

    Overnight: Patchy fog before 2am. Otherwise, mostly clear, with a low around 57. Calm wind.

    Low: 57 °F

    Patchy Fog

  • Wednesday

    Wednesday: Sunny, with a high near 81. Calm wind becoming west around 6 mph in the afternoon.

    High: 81 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 61. Light west wind.

    Low: 61 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 78. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 78 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers before 8pm. Partly cloudy, with a low around 54. Light north wind. Chance of precipitation is 30%.

    Low: 54 °F

    Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers after 2pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.

    High: 76 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely, mainly after 8pm. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.

    Low: 60 °F

    Showers
    Likely

Detailed Forecast

Overnight
Patchy fog before 2am. Otherwise, mostly clear, with a low around 57. Calm wind.
Wednesday
Sunny, with a high near 81. Calm wind becoming west around 6 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 61. Light west wind.
Thursday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 78. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A chance of showers before 8pm. Partly cloudy, with a low around 54. Light north wind. Chance of precipitation is 30%.
Friday
Sunny, with a high near 78.
Friday Night
Partly cloudy, with a low around 58.
Saturday
A chance of showers after 2pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.
Saturday Night
Showers likely, mainly after 8pm. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Sunday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 76. Chance of precipitation is 60%.
Sunday Night
Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 56. Chance of precipitation is 60%.
Monday
Sunny, with a high near 75.
Monday Night
Mostly clear, with a low around 56.
Tuesday
Mostly sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Upper Mongaup NY
 41.47°N 74.8°W (Elev. 1224 ft)
Last Update:
2:30 pm EDT Aug 18, 2026
Forecast Valid:
1am EDT Aug 19, 2026-6pm EDT Aug 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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