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.

A Few Clouds

81°F

27°C

Humidity 49%
Wind Speed N 17 G 23 mph
Barometer 30.02 in (1016.3 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 13 Sep 2:55 pm EDT
Extended Forecast for

Grissom Air Force Base / Peru IN

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 81. Northwest wind around 15 mph.

    High: 81 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of showers between 8pm and 9pm. Mostly clear, with a low around 50. North wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 50 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 76. East wind 5 to 10 mph.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61. Southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Sunny and hot, with a high near 90. Southwest wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    High: 90 °F

    Sunny then
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 67. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 67 °F

    Showers
    Likely

  • 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 86. Chance of precipitation is 50%.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms, mainly after 2am. Partly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 2pm. Mostly sunny, with a high near 86. Chance of precipitation is 40%.

    High: 86 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 81. Northwest wind around 15 mph.
Tonight
A slight chance of showers between 8pm and 9pm. Mostly clear, with a low around 50. North wind 5 to 10 mph. Chance of precipitation is 20%.
Monday
Sunny, with a high near 76. East wind 5 to 10 mph.
Monday Night
Partly cloudy, with a low around 61. Southeast wind around 10 mph, with gusts as high as 20 mph.
Tuesday
A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Sunny and hot, with a high near 90. Southwest wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 67. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
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 86. Chance of precipitation is 50%.
Wednesday Night
A 40 percent chance of showers and thunderstorms, mainly after 2am. Partly cloudy, with a low around 69.
Thursday
A chance of showers, with thunderstorms also possible after 2pm. Mostly sunny, with a high near 86. Chance of precipitation is 40%.
Thursday Night
A slight chance of thunderstorms before 8pm. Mostly cloudy, with a low around 65. Chance of precipitation is 10%.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62.
Saturday
A chance of showers. Mostly sunny, with a high near 82.
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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:
3:31 pm EDT Sep 13, 2026
Forecast Valid:
3pm EDT Sep 13, 2026-6pm EDT Sep 19, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation