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

Penn Yan, Penn Yan Airport (KPEO)

Lat: 42.64°NLon: 77.05°WElev: 902ft.

Fair

11°F

-12°C

Humidity 77%
Wind Speed SW 9 mph
Barometer 30.16 in (1023.5 mb)
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill-2°F (-19°C)
Last update 9 Dec 5:53 am EST
Extended Forecast for

Rock Stream NY

  • Today

    Today: A slight chance of snow showers after 3pm. Increasing clouds, with a high near 28. Wind chill values as low as -3. South wind 6 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.

    High: 28 °F

    Mostly Sunny
    then Slight
    Chance Snow
    Showers

  • Tonight

    Tonight: A chance of snow showers, mainly after 5am. Mostly cloudy, with a low around 24. South wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.

    Low: 24 °F

    Mostly Cloudy
    then Chance
    Snow Showers

  • Wednesday

    Wednesday: Rain and snow showers, becoming all rain after 4pm. High near 38. South wind 14 to 16 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 38 °F

    Rain/Snow

  • Wednesday Night

    Wednesday Night: Rain showers likely before 7pm, then rain and snow showers likely between 7pm and 10pm, then snow showers likely after 10pm. Mostly cloudy, with a low around 22. Southwest wind 11 to 13 mph becoming west after midnight. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 22 °F

    Rain/Snow
    Likely then
    Snow Showers
    Likely

  • Thursday

    Thursday: A slight chance of snow showers after 1pm. Partly sunny, with a high near 28. West wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.

    High: 28 °F

    Partly Sunny
    then Slight
    Chance Snow
    Showers

  • Thursday Night

    Thursday Night: A slight chance of snow showers. Mostly cloudy, with a low around 19. Chance of precipitation is 20%.

    Low: 19 °F

    Slight Chance
    Snow Showers

  • Friday

    Friday: Mostly cloudy, with a high near 29.

    High: 29 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A chance of snow showers. Mostly cloudy, with a low around 20. Chance of precipitation is 50%.

    Low: 20 °F

    Chance Snow
    Showers

  • Saturday

    Saturday: A chance of snow showers. Mostly cloudy, with a high near 29. Chance of precipitation is 40%.

    High: 29 °F

    Chance Snow
    Showers

Detailed Forecast

Today
A slight chance of snow showers after 3pm. Increasing clouds, with a high near 28. Wind chill values as low as -3. South wind 6 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.
Tonight
A chance of snow showers, mainly after 5am. Mostly cloudy, with a low around 24. South wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
Wednesday
Rain and snow showers, becoming all rain after 4pm. High near 38. South wind 14 to 16 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Wednesday Night
Rain showers likely before 7pm, then rain and snow showers likely between 7pm and 10pm, then snow showers likely after 10pm. Mostly cloudy, with a low around 22. Southwest wind 11 to 13 mph becoming west after midnight. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday
A slight chance of snow showers after 1pm. Partly sunny, with a high near 28. West wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.
Thursday Night
A slight chance of snow showers. Mostly cloudy, with a low around 19. Chance of precipitation is 20%.
Friday
Mostly cloudy, with a high near 29.
Friday Night
A chance of snow showers. Mostly cloudy, with a low around 20. Chance of precipitation is 50%.
Saturday
A chance of snow showers. Mostly cloudy, with a high near 29. Chance of precipitation is 40%.
Saturday Night
A chance of snow showers. Mostly cloudy, with a low around 17. Chance of precipitation is 50%.
Sunday
A chance of snow showers. Partly sunny, with a high near 23. Chance of precipitation is 40%.
Sunday Night
Mostly cloudy, with a low around 12.
Monday
Mostly cloudy, with a high near 22.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Rock Stream NY
 42.46°N 76.92°W (Elev. 879 ft)
Last Update:
6:18 am EST Dec 9, 2025
Forecast Valid:
6am EST Dec 9, 2025-6pm EST Dec 15, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation