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

Waterloo, Waterloo Municipal Airport (KALO)

Lat: 42.55°NLon: 92.4°WElev: 873ft.

Light Rain

70°F

21°C

Humidity 90%
Wind Speed S 13 G 29 mph
Barometer 29.88 in (1011.6 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 19 Sep 11:54 am CDT
Extended Forecast for

Waterloo IA

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm. Mostly cloudy, with a high near 76. South wind 5 to 7 mph becoming west southwest. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Showers
    Likely

  • Tonight

    Tonight: A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. North wind 8 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 60 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: A chance of drizzle. Cloudy, with a high near 67. Northeast wind around 14 mph, with gusts as high as 22 mph.

    High: 67 °F

    Chance
    Drizzle

  • Sunday Night

    Sunday Night: A slight chance of drizzle before 1am, then a chance of showers after 1am. Cloudy, with a low around 55. East northeast wind 11 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 55 °F

    Slight Chance
    Drizzle then
    Chance
    Showers

  • Monday

    Monday: A 40 percent chance of showers. Mostly cloudy, with a high near 63. East northeast wind around 14 mph, with gusts as high as 21 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 63 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm. Mostly cloudy, with a high near 76. South wind 5 to 7 mph becoming west southwest. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. North wind 8 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
A chance of drizzle. Cloudy, with a high near 67. Northeast wind around 14 mph, with gusts as high as 22 mph.
Sunday Night
A slight chance of drizzle before 1am, then a chance of showers after 1am. Cloudy, with a low around 55. East northeast wind 11 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
A 40 percent chance of showers. Mostly cloudy, with a high near 63. East northeast wind around 14 mph, with gusts as high as 21 mph. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 49.
Tuesday
Partly sunny, with a high near 61.
Tuesday Night
Mostly clear, with a low around 46.
Wednesday
Sunny, with a high near 66.
Wednesday Night
Partly cloudy, with a low around 51.
Thursday
Partly sunny, with a high near 67.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Partly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IA
 42.49°N 92.35°W
Last Update:
12:06 pm CDT Sep 19, 2026
Forecast Valid:
12pm CDT Sep 19, 2026-6pm CDT Sep 25, 2026
 
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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