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

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

Grissom Air Force Base / Peru (KGUS)

Lat: 40.65°NLon: 86.15°WElev: 810ft.

Fog/Mist

44°F

7°C

Humidity 95%
Wind Speed NE 8 mph
Barometer 30.08 in (1019.3 mb)
Dewpoint 43°F (6°C)
Visibility 6.00 mi
Wind Chill39°F (4°C)
Last update 25 Dec 7:55 am EST
Extended Forecast for

Grissom Air Force Base / Peru IN

  • Christmas Day

    Christmas Day: A slight chance of drizzle before 10am. Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 49. Northeast wind 5 to 10 mph.

    High: 49 °F

    Slight Chance
    Drizzle and
    Areas Fog
    then Mostly
    Cloudy

  • Tonight

    Tonight: A 50 percent chance of rain after 1am. Cloudy, with a low around 38. East wind around 15 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Mostly Cloudy
    then Chance
    Rain

  • Friday

    Friday: Rain likely before 1pm. Mostly cloudy, with a high near 59. Southeast wind around 15 mph becoming west in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.

    High: 59 °F

    Rain Likely

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 38. Northwest wind 5 to 10 mph.

    Low: 38 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 52. Southeast wind 5 to 10 mph.

    High: 52 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy
    then Chance
    Rain

  • Sunday

    Sunday: A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 61. Chance of precipitation is 70%.

    High: 61 °F

    Rain Likely

  • Sunday Night

    Sunday Night: Rain likely before 1am, then a slight chance of rain and snow. Cloudy, with a low around 21. Blustery. Chance of precipitation is 60%.

    Low: 21 °F

    Rain Likely
    then
    Rain/Snow
    Likely and
    Blustery

  • Monday

    Monday: Partly sunny, with a high near 26. Breezy.

    High: 26 °F

    Partly Sunny
    and Breezy

Detailed Forecast

Christmas Day
A slight chance of drizzle before 10am. Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 49. Northeast wind 5 to 10 mph.
Tonight
A 50 percent chance of rain after 1am. Cloudy, with a low around 38. East wind around 15 mph, with gusts as high as 20 mph.
Friday
Rain likely before 1pm. Mostly cloudy, with a high near 59. Southeast wind around 15 mph becoming west in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.
Friday Night
Mostly cloudy, with a low around 38. Northwest wind 5 to 10 mph.
Saturday
Mostly cloudy, with a high near 52. Southeast wind 5 to 10 mph.
Saturday Night
A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 46.
Sunday
A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 61. Chance of precipitation is 70%.
Sunday Night
Rain likely before 1am, then a slight chance of rain and snow. Cloudy, with a low around 21. Blustery. Chance of precipitation is 60%.
Monday
Partly sunny, with a high near 26. Breezy.
Monday Night
Partly cloudy, with a low around 14.
Tuesday
Partly sunny, with a high near 27.
Tuesday Night
Mostly cloudy, with a low around 20.
Wednesday
Partly sunny, with a high near 33.
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Forecast Area
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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:
8:46 am EST Dec 25, 2025
Forecast Valid:
9am EST Dec 25, 2025-6pm EST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation