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

68°F

20°C

Humidity 84%
Wind Speed SW 8 mph
Barometer 29.93 in (1012.6 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 26 Jul 4:53 am EDT
Extended Forecast for

Rock Stream NY

  • Today

    Today: Isolated showers, then scattered showers and thunderstorms after 11am. Partly sunny, with a high near 80. Light south wind. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 80 °F

    Isolated
    T-storms then
    Scattered
    T-storms

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 63. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Scattered
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Scattered showers and thunderstorms, mainly between 2pm and 5pm. Partly sunny, with a high near 83. Light and variable wind. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 83 °F

    Mostly Sunny
    then
    Scattered
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 2am, then showers likely between 2am and 5am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 64. Calm wind becoming south around 6 mph after midnight. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 64 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 75. South wind around 7 mph. Chance of precipitation is 100%.

    High: 75 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 62. Chance of precipitation is 80%.

    Low: 62 °F

    Showers

  • Wednesday

    Wednesday: Showers likely, then showers and possibly a thunderstorm after 2pm. High near 72. Chance of precipitation is 80%.

    High: 72 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 8pm, then showers likely. Low around 60. Chance of precipitation is 80%.

    Low: 60 °F

    Showers

  • Thursday

    Thursday: A chance of showers. Partly sunny, with a high near 73. Chance of precipitation is 40%.

    High: 73 °F

    Chance
    Showers

Detailed Forecast

Today
Isolated showers, then scattered showers and thunderstorms after 11am. Partly sunny, with a high near 80. Light south wind. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Scattered showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 63. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
Scattered showers and thunderstorms, mainly between 2pm and 5pm. Partly sunny, with a high near 83. Light and variable wind. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
A chance of showers and thunderstorms before 2am, then showers likely between 2am and 5am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 64. Calm wind becoming south around 6 mph after midnight. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
Showers and possibly a thunderstorm. High near 75. South wind around 7 mph. Chance of precipitation is 100%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 62. Chance of precipitation is 80%.
Wednesday
Showers likely, then showers and possibly a thunderstorm after 2pm. High near 72. Chance of precipitation is 80%.
Wednesday Night
Showers and possibly a thunderstorm before 8pm, then showers likely. Low around 60. Chance of precipitation is 80%.
Thursday
A chance of showers. Partly sunny, with a high near 73. Chance of precipitation is 40%.
Thursday Night
Partly cloudy, with a low around 60.
Friday
Mostly sunny, with a high near 78.
Friday Night
Partly cloudy, with a low around 63.
Saturday
A chance of showers. Partly sunny, with a high near 80. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
Rock Stream NY
 42.46°N 76.92°W (Elev. 879 ft)
Last Update:
2:30 am EDT Jul 26, 2026
Forecast Valid:
5am EDT Jul 26, 2026-6pm EDT Aug 1, 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