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

Hazardous Weather Conditions

Current conditions at

Grissom Air Force Base / Peru (KGUS)

Lat: 40.65°NLon: 86.15°WElev: 810ft.

Fair

76°F

24°C

Humidity 90%
Wind Speed Calm
Barometer 29.99 in (1014.9 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 1 Jul 1:55 am EDT
Extended Forecast for

Onward IN

Extreme Heat Warning July 1, 02:53am until July 2, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 1, 02:53am until July 2, 08:00pm

    NOW until 8:00pm Thu

    Extreme Heat Warning

  • Overnight

    Low: 74 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 94. Heat index values as high as 107. Southwest wind around 10 mph.

    High: 94 °F

    Hot

  • Wednesday Night

    Wednesday Night: Clear, with a low around 74. Southwest wind 5 to 10 mph.

    Low: 74 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 93. Heat index values as high as 106. Southwest wind around 10 mph.

    High: 93 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 73. Southwest wind 5 to 10 mph.

    Low: 73 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly sunny and hot, with a high near 92. Chance of precipitation is 50%.

    High: 92 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms, mainly after 2am. Partly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms

  • Independence Day

    Independence Day: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly sunny and hot, with a high near 90. Chance of precipitation is 60%.

    High: 90 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Overnight
Mostly clear, with a low around 74. Southwest wind around 5 mph.
Wednesday
Sunny and hot, with a high near 94. Heat index values as high as 107. Southwest wind around 10 mph.
Wednesday Night
Clear, with a low around 74. Southwest wind 5 to 10 mph.
Thursday
Sunny and hot, with a high near 93. Heat index values as high as 106. Southwest wind around 10 mph.
Thursday Night
Mostly clear, with a low around 73. Southwest wind 5 to 10 mph.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly sunny and hot, with a high near 92. Chance of precipitation is 50%.
Friday Night
A 50 percent chance of showers and thunderstorms, mainly after 2am. Partly cloudy, with a low around 72.
Independence Day
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly sunny and hot, with a high near 90. Chance of precipitation is 60%.
Saturday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.
Sunday
Showers likely, with thunderstorms also possible after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 60%.
Sunday Night
Showers and thunderstorms likely. Partly cloudy, with a low around 68. Chance of precipitation is 60%.
Monday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Onward IN
 40.7°N 86.19°W (Elev. 761 ft)
Last Update:
2:31 am EDT Jul 1, 2026
Forecast Valid:
2am EDT Jul 1, 2026-6pm EDT Jul 7, 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