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

Grissom Air Force Base / Peru (KGUS)

Lat: 40.65°NLon: 86.15°WElev: 810ft.

Fog/Mist

69°F

21°C

Humidity 95%
Wind Speed Calm
Barometer 30.02 in (1016.2 mb)
Dewpoint 67°F (19°C)
Visibility 6.00 mi
Last update 7 Jul 4:55 am EDT
Extended Forecast for

Grissom Air Force Base / Peru IN

  • Today

    Today: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 85. Calm wind becoming north around 5 mph in the morning.

    High: 85 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 62. North wind around 5 mph becoming calm in the evening.

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 86. Calm wind.

    High: 86 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 65. Calm wind becoming south around 5 mph.

    Low: 65 °F

    Mostly Clear

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87. Southwest wind 5 to 10 mph.

    High: 87 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 68. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 68 °F

    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 83. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely then
    Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers, mainly after 2pm. Partly sunny, with a high near 83.

    High: 83 °F

    Chance
    Showers

Detailed Forecast

Today
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 85. Calm wind becoming north around 5 mph in the morning.
Tonight
Mostly clear, with a low around 62. North wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 86. Calm wind.
Wednesday Night
Mostly clear, with a low around 65. Calm wind becoming south around 5 mph.
Thursday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87. Southwest wind 5 to 10 mph.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 68. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 83. Chance of precipitation is 60%.
Friday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Saturday
A 30 percent chance of showers, mainly after 2pm. Partly sunny, with a high near 83.
Saturday Night
A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 65.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Sunday Night
A 10 percent chance of showers and thunderstorms. Mostly clear, with a low around 65.
Monday
Sunny, with a high near 86.
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ABOUT THIS FORECAST

 
Point Forecast:
Grissom Air Force Base / Peru IN
 40.65°N 86.14°W (Elev. 804 ft)
Last Update:
5:46 am EDT Jul 7, 2026
Forecast Valid:
5am EDT Jul 7, 2026-6pm EDT Jul 13, 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