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

Excessive Rainfall and Significant Flooding in the Upper Midwest This Weekend

Heavy to excessive rainfall is expected over the weekend across eastern Iowa, northern Missouri, northwest Illinois and southern Wisconsin. Numerous flash floods, some with significant impacts, are expected in these areas. Heaviest rainfall will occur overnight Saturday and Sunday, so be sure to have multiple ways to receive warnings. Read More >

Hazardous Weather Conditions

Current conditions at

Rochester, Greater Rochester International Airport (KROC)

Lat: 43.12°NLon: 77.68°WElev: 558ft.

Mostly Cloudy

85°F

29°C

Humidity 43%
Wind Speed Vrbl 3 mph
Barometer 30.17 in (1021.6 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 9 Aug 12:54 pm EDT
Extended Forecast for

Clarkson NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 89. South wind around 7 mph.

    High: 89 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 68. Northeast wind 5 to 7 mph becoming light and variable.

    Low: 68 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 92. Southwest wind around 6 mph becoming southeast in the afternoon.

    High: 92 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 68. Light and variable wind becoming south around 6 mph after midnight.

    Low: 68 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 92. Southwest wind around 6 mph becoming east in the afternoon.

    High: 92 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 70. South wind 3 to 6 mph.

    Low: 70 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 92. West wind around 7 mph.

    High: 92 °F

    Hot

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 69. Southwest wind around 6 mph. Chance of precipitation is 40%.

    Low: 69 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 40%.

    High: 87 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 89. South wind around 7 mph.
Tonight
Mostly clear, with a low around 68. Northeast wind 5 to 7 mph becoming light and variable.
Sunday
Sunny and hot, with a high near 92. Southwest wind around 6 mph becoming southeast in the afternoon.
Sunday Night
Mostly clear, with a low around 68. Light and variable wind becoming south around 6 mph after midnight.
Monday
Sunny and hot, with a high near 92. Southwest wind around 6 mph becoming east in the afternoon.
Monday Night
Mostly clear, with a low around 70. South wind 3 to 6 mph.
Tuesday
Sunny and hot, with a high near 92. West wind around 7 mph.
Tuesday Night
A chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 69. Southwest wind around 6 mph. Chance of precipitation is 40%.
Wednesday
A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 40%.
Wednesday Night
A chance of thunderstorms before 8pm. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 86.
Thursday Night
Partly cloudy, with a low around 66.
Friday
Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Clarkson NY
 43.24°N 77.92°W (Elev. 390 ft)
Last Update:
10:36 am EDT Aug 9, 2025
Forecast Valid:
1pm EDT Aug 9, 2025-6pm EDT Aug 15, 2025
 
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