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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Clinton Municipal Airport (KCWI)

Lat: 41.83°NLon: 90.33°WElev: 696ft.

Overcast

69°F

21°C

Humidity 87%
Wind Speed E 10 mph
Barometer 30.08 in (1018.5 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 18 Sep 7:56 pm CDT
Extended Forecast for

Princeton IA

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Increasing clouds, with a low around 67. East wind around 10 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 67 °F

    Mostly Cloudy
    then Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms, mainly after 3pm. Mostly cloudy, with a high near 82. Southeast wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 82 °F

    Showers
    Likely then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely before midnight, then showers and possibly a thunderstorm between midnight and 4am, then showers after 4am. Low around 64. South wind around 5 mph becoming north after midnight. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 64 °F

    Showers

  • Sunday

    Sunday: Showers likely, with thunderstorms also possible after 7am. Mostly cloudy, with a high near 70. Northeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 70 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.

    Low: 57 °F

    Showers
    Likely

  • Monday

    Monday: Showers likely, mainly before 1pm. Cloudy, with a high near 65. Chance of precipitation is 60%.

    High: 65 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Increasing clouds, with a low around 67. East wind around 10 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms, mainly after 3pm. Mostly cloudy, with a high near 82. Southeast wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers and thunderstorms likely before midnight, then showers and possibly a thunderstorm between midnight and 4am, then showers after 4am. Low around 64. South wind around 5 mph becoming north after midnight. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday
Showers likely, with thunderstorms also possible after 7am. Mostly cloudy, with a high near 70. Northeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.
Monday
Showers likely, mainly before 1pm. Cloudy, with a high near 65. Chance of precipitation is 60%.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 52.
Tuesday
Mostly cloudy, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Partly sunny, with a high near 67.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
Partly sunny, with a high near 70.
Thursday Night
Partly cloudy, with a low around 54.
Friday
Mostly sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton IA
 41.68°N 90.35°W (Elev. 669 ft)
Last Update:
6:11 pm CDT Sep 18, 2026
Forecast Valid:
8pm CDT Sep 18, 2026-6pm CDT Sep 25, 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