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

Dangerous Heat in the Central and Eastern U.S.; Critical Fire Weather in the Great Basin and Southwest

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Heat is likely to continue across the eastern U.S. through the Independence Day holiday weekend. Critical fire weather conditions will continue Tuesday across portions of the Four Corners and Great Basin, as dry conditions and gusty winds persist. Read More >

Hazardous Weather Conditions

Current conditions at

Cattaraugus County-Olean Airport (KOLE)

Lat: 42.24°NLon: 78.37°WElev: 2135ft.

Overcast

70°F

21°C

Humidity 78%
Wind Speed Calm
Barometer 30.17 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 30 Jun 1:55 am EDT
Extended Forecast for

Portville NY

Heat Advisory June 30, 12:00pm until June 30, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Partly cloudy, with a low around 65. South wind 3 to 5 mph.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89. Southwest wind 6 to 9 mph.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 71. Southwest wind around 6 mph.

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny and hot, with a high near 93. Heat index values as high as 96. West wind 6 to 8 mph.

    High: 93 °F

    Hot

  • Wednesday Night

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

    Low: 70 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 94. West wind 3 to 8 mph.

    High: 94 °F

    Hot

  • Thursday Night

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

    Low: 70 °F

    Mostly Clear

  • Friday

    Friday: A chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 90. West wind 3 to 8 mph. Chance of precipitation is 40%.

    High: 90 °F

    Sunny then
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 40%.

    Low: 68 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Partly cloudy, with a low around 65. South wind 3 to 5 mph.
Tuesday
Mostly sunny, with a high near 89. Southwest wind 6 to 9 mph.
Tuesday Night
Partly cloudy, with a low around 71. Southwest wind around 6 mph.
Wednesday
Sunny and hot, with a high near 93. Heat index values as high as 96. West wind 6 to 8 mph.
Wednesday Night
Mostly clear, with a low around 70. Southwest wind 3 to 6 mph.
Thursday
Sunny and hot, with a high near 94. West wind 3 to 8 mph.
Thursday Night
Mostly clear, with a low around 70. Southwest wind 3 to 6 mph.
Friday
A chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 90. West wind 3 to 8 mph. Chance of precipitation is 40%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 40%.
Independence Day
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 86. Chance of precipitation is 60%.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 30%.
Monday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 83. Chance of precipitation is 60%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portville NY
 42.03°N 78.36°W (Elev. 1932 ft)
Last Update:
9:57 pm EDT Jun 29, 2026
Forecast Valid:
1am EDT Jun 30, 2026-6pm EDT Jul 6, 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