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.

Overcast

22°F

-6°C

Humidity 89%
Wind Speed S 9 mph
Barometer 30.14 in (1022.3 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 28 Dec 12:53 am EST
Extended Forecast for

Rock Stream NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 19. South wind around 6 mph.

    Low: 19 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain, mainly after 3pm. High near 39. South wind 9 to 13 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 39 °F

    Mostly Cloudy
    then Rain

  • Sunday Night

    Sunday Night: Rain. Temperature falling to near 35 by 8pm, then rising to around 44 during the remainder of the night. South wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 35 °F⇑

    Rain

  • Monday

    Monday: Rain showers likely before 1pm, then a chance of snow showers. Mostly cloudy, with a high near 45. Breezy, with a southwest wind 15 to 23 mph, with gusts as high as 38 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 45 °F

    Showers
    Likely then
    Rain/Snow
    Likely and
    Breezy

  • Monday Night

    Monday Night: Snow showers likely. Patchy blowing snow. Mostly cloudy, with a low around 20. Breezy, with a west wind 23 to 25 mph, with gusts as high as 39 mph. Chance of precipitation is 70%.

    Low: 20 °F

    Snow Showers
    Likely and
    Patchy
    Blowing Snow

  • Tuesday

    Tuesday: A chance of snow showers. Patchy blowing snow before 1pm. Mostly cloudy, with a high near 25. Breezy. Chance of precipitation is 50%.

    High: 25 °F

    Chance Snow
    Showers and
    Patchy
    Blowing Snow

  • Tuesday Night

    Tuesday Night: A chance of snow showers after 1am. Mostly cloudy, with a low around 22. Chance of precipitation is 30%.

    Low: 22 °F

    Mostly Cloudy
    then Chance
    Snow Showers

  • Wednesday

    Wednesday: Snow showers likely, mainly after 1pm. Mostly cloudy, with a high near 29. Chance of precipitation is 70%.

    High: 29 °F

    Chance Snow
    Showers then
    Snow Showers
    Likely

  • Wednesday Night

    Wednesday Night: Snow showers likely, mainly before 1am. Mostly cloudy, with a low around 16. Chance of precipitation is 60%.

    Low: 16 °F

    Snow Showers
    Likely

Detailed Forecast

Overnight
Mostly cloudy, with a low around 19. South wind around 6 mph.
Sunday
Rain, mainly after 3pm. High near 39. South wind 9 to 13 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Rain. Temperature falling to near 35 by 8pm, then rising to around 44 during the remainder of the night. South wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Rain showers likely before 1pm, then a chance of snow showers. Mostly cloudy, with a high near 45. Breezy, with a southwest wind 15 to 23 mph, with gusts as high as 38 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Monday Night
Snow showers likely. Patchy blowing snow. Mostly cloudy, with a low around 20. Breezy, with a west wind 23 to 25 mph, with gusts as high as 39 mph. Chance of precipitation is 70%.
Tuesday
A chance of snow showers. Patchy blowing snow before 1pm. Mostly cloudy, with a high near 25. Breezy. Chance of precipitation is 50%.
Tuesday Night
A chance of snow showers after 1am. Mostly cloudy, with a low around 22. Chance of precipitation is 30%.
Wednesday
Snow showers likely, mainly after 1pm. Mostly cloudy, with a high near 29. Chance of precipitation is 70%.
Wednesday Night
Snow showers likely, mainly before 1am. Mostly cloudy, with a low around 16. Chance of precipitation is 60%.
New Year's Day
A chance of snow showers. Mostly cloudy, with a high near 23. Chance of precipitation is 40%.
Thursday Night
Mostly cloudy, with a low around 12.
Friday
Mostly cloudy, with a high near 23.
Friday Night
Mostly cloudy, with a low around 16.
Saturday
Mostly cloudy, with a high near 30.
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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:
12:28 am EST Dec 28, 2025
Forecast Valid:
1am EST Dec 28, 2025-6pm EST Jan 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