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 5am. Otherwise, mostly clear, with a low around 57. Calm wind.

    Low: 57 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, sunny, with a high near 82. Calm wind becoming west around 6 mph in the afternoon.

    High: 82 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

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

    Low: 61 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of showers before 2pm, then a chance of showers after 5pm. Increasing clouds, with a high near 78. Calm wind becoming northwest around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 78 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers before 7pm. Partly cloudy, with a low around 54. Calm wind. Chance of precipitation is 30%.

    Low: 54 °F

    Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers after 2pm. Partly sunny, with a high near 77. Chance of precipitation is 40%.

    High: 77 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely, mainly after 8pm. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.

    Low: 59 °F

    Showers
    Likely

Detailed Forecast

Overnight
Patchy fog before 5am. Otherwise, mostly clear, with a low around 57. Calm wind.
Wednesday
Patchy fog before 9am. Otherwise, sunny, with a high near 82. Calm wind becoming west around 6 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 61. Calm wind.
Thursday
A chance of showers before 2pm, then a chance of showers after 5pm. Increasing clouds, with a high near 78. Calm wind becoming northwest around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A chance of showers before 7pm. Partly cloudy, with a low around 54. Calm wind. Chance of precipitation is 30%.
Friday
Sunny, with a high near 79.
Friday Night
Partly cloudy, with a low around 57.
Saturday
A chance of showers after 2pm. Partly sunny, with a high near 77. Chance of precipitation is 40%.
Saturday Night
Showers likely, mainly after 8pm. Mostly cloudy, with a low around 59. 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 77. 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 76.
Monday Night
Mostly clear, with a low around 55.
Tuesday
Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Upper Mongaup NY
 41.47°N 74.77°W (Elev. 1201 ft)
Last Update:
1:03 am EDT Aug 19, 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