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

24°F

-4°C

Humidity 62%
Wind Speed Calm
Barometer 30.51 in (1034.5 mb)
Dewpoint 13°F (-11°C)
Visibility 10.00 mi
Last update 7 Apr 10:53 pm EDT
Extended Forecast for

Rock Stream NY

  • Tonight

    Tonight: Partly cloudy, with a low around 17. Northwest wind around 5 mph becoming calm after midnight.

    Low: 17 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 50. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 50 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 35. South wind 9 to 14 mph, with gusts as high as 24 mph.

    Low: 35 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 60. South wind around 17 mph, with gusts as high as 28 mph.

    High: 60 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 43. South wind 9 to 14 mph.

    Low: 43 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 50%.

    High: 61 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers before 2am. Mostly cloudy, with a low around 35. Chance of precipitation is 40%.

    Low: 35 °F

    Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 17. Northwest wind around 5 mph becoming calm after midnight.
Wednesday
Sunny, with a high near 50. Calm wind becoming south 5 to 8 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 35. South wind 9 to 14 mph, with gusts as high as 24 mph.
Thursday
Mostly sunny, with a high near 60. South wind around 17 mph, with gusts as high as 28 mph.
Thursday Night
Partly cloudy, with a low around 43. South wind 9 to 14 mph.
Friday
A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 50%.
Friday Night
A chance of showers before 2am. Mostly cloudy, with a low around 35. Chance of precipitation is 40%.
Saturday
Sunny, with a high near 51.
Saturday Night
Mostly clear, with a low around 33.
Sunday
Mostly sunny, with a high near 64.
Sunday Night
Mostly cloudy, with a low around 53.
Monday
A chance of showers. Mostly cloudy, with a high near 73. Chance of precipitation is 30%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 73. Chance of precipitation is 40%.
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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:
6:48 pm EDT Apr 7, 2026
Forecast Valid:
11pm EDT Apr 7, 2026-6pm EDT Apr 14, 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