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

37°F

3°C

Humidity 93%
Wind Speed NE 3 mph
Barometer 30.20 in (1023.1 mb)
Dewpoint 35°F (2°C)
Visibility 8.00 mi
Last update 27 Apr 4:56 am EDT
Extended Forecast for

Mongaup Valley NY

  • Today

    Today: Patchy fog before 8am. Patchy frost before 8am. Otherwise, sunny, with a high near 66. Calm wind becoming east around 5 mph in the afternoon.

    High: 66 °F

    Patchy Frost
    and Patchy
    Fog then
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 38. Calm wind.

    Low: 38 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 63. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 63 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A slight chance of showers before 2am. Mostly cloudy, with a low around 42. Light south wind. Chance of precipitation is 20%.

    Low: 42 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers after 2pm. Mostly cloudy, with a high near 61. Calm wind becoming southeast 5 to 7 mph in the afternoon. Chance of precipitation is 40%.

    High: 61 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: Showers, mainly after 8pm. Low around 43. Chance of precipitation is 100%.

    Low: 43 °F

    Showers

  • Thursday

    Thursday: Showers likely, mainly before 2pm. Mostly cloudy, with a high near 52. Chance of precipitation is 60%.

    High: 52 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers before 8pm. Mostly cloudy, with a low around 34. Chance of precipitation is 30%.

    Low: 34 °F

    Chance
    Showers then
    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

Detailed Forecast

Today
Patchy fog before 8am. Patchy frost before 8am. Otherwise, sunny, with a high near 66. Calm wind becoming east around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 38. Calm wind.
Tuesday
Increasing clouds, with a high near 63. Calm wind becoming south 5 to 8 mph in the afternoon.
Tuesday Night
A slight chance of showers before 2am. Mostly cloudy, with a low around 42. Light south wind. Chance of precipitation is 20%.
Wednesday
A chance of showers after 2pm. Mostly cloudy, with a high near 61. Calm wind becoming southeast 5 to 7 mph in the afternoon. Chance of precipitation is 40%.
Wednesday Night
Showers, mainly after 8pm. Low around 43. Chance of precipitation is 100%.
Thursday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 52. Chance of precipitation is 60%.
Thursday Night
A chance of showers before 8pm. Mostly cloudy, with a low around 34. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 50.
Friday Night
Mostly cloudy, with a low around 33.
Saturday
Partly sunny, with a high near 50.
Saturday Night
Mostly cloudy, with a low around 31.
Sunday
Partly sunny, with a high near 51.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mongaup Valley NY
 41.65°N 74.79°W (Elev. 1181 ft)
Last Update:
2:30 am EDT Apr 27, 2026
Forecast Valid:
5am EDT Apr 27, 2026-6pm EDT May 3, 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