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

Excessive Rainfall and Potential Tropical Cyclone in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Niagara Falls, Niagara Falls International Airport (KIAG)

Lat: 43.11°NLon: 78.94°WElev: 587ft.

Fair

57°F

14°C

Humidity 90%
Wind Speed SE 6 mph
Barometer 29.68 in (1004.8 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 17 Jun 2:53 am EDT
Extended Forecast for

Lewiston NY

  • Overnight

    Overnight: A chance of showers, mainly before 5am. Mostly cloudy, with a low around 60. South wind around 7 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 60 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 76. Southwest wind 10 to 15 mph.

    High: 76 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Showers, with thunderstorms also possible after 2am. Low around 61. Breezy, with a south wind 8 to 13 mph becoming southeast 16 to 21 mph after midnight. Winds could gust as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 61 °F

    Showers and
    Breezy

  • Thursday

    Thursday: A chance of showers and thunderstorms before 8am, then showers likely between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 76. Breezy, with a southwest wind 21 to 23 mph, with gusts as high as 46 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Showers
    Likely and
    Breezy

  • Thursday Night

    Thursday Night: A chance of showers before 8pm. Partly cloudy, with a low around 58. West wind 13 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 58 °F

    Chance
    Showers then
    Mostly Clear

  • Juneteenth

    Juneteenth: A slight chance of showers after 2pm. Sunny, with a high near 75. West wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.

    High: 75 °F

    Sunny then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 56. West wind 11 to 13 mph.

    Low: 56 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 75. West wind around 15 mph.

    High: 75 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Overnight
A chance of showers, mainly before 5am. Mostly cloudy, with a low around 60. South wind around 7 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 76. Southwest wind 10 to 15 mph.
Wednesday Night
Showers, with thunderstorms also possible after 2am. Low around 61. Breezy, with a south wind 8 to 13 mph becoming southeast 16 to 21 mph after midnight. Winds could gust as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
A chance of showers and thunderstorms before 8am, then showers likely between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 76. Breezy, with a southwest wind 21 to 23 mph, with gusts as high as 46 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A chance of showers before 8pm. Partly cloudy, with a low around 58. West wind 13 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Juneteenth
A slight chance of showers after 2pm. Sunny, with a high near 75. West wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
Friday Night
Mostly clear, with a low around 56. West wind 11 to 13 mph.
Saturday
Sunny, with a high near 75. West wind around 15 mph.
Saturday Night
Mostly clear, with a low around 56.
Sunday
Sunny, with a high near 77.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 58. Chance of precipitation is 50%.
Monday
A chance of showers. Partly sunny, with a high near 75. Chance of precipitation is 50%.
Monday Night
Partly cloudy, with a low around 59.
Tuesday
Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lewiston NY
 43.16°N 79.03°W (Elev. 548 ft)
Last Update:
2:22 am EDT Jun 17, 2026
Forecast Valid:
3am EDT Jun 17, 2026-6pm EDT Jun 23, 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