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.

Overcast

61°F

16°C

Humidity 100%
Wind Speed NE 12 mph
Barometer 29.93 in (1013.2 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 19 Sep 4:54 am CDT
Extended Forecast for

Waterloo IA

Flood Watch September 19, 05:18am until September 19, 01:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch September 19, 05:18am until September 19, 01:00pm

    NOW until 1:00pm Sat

    Flood Watch

  • Overnight

    Low: 66 °F

    Showers
    Likely and
    Patchy Fog

  • Saturday

    Saturday: Showers and thunderstorms likely before 3pm, then showers likely and possibly a thunderstorm between 3pm and 4pm, then a chance of showers and thunderstorms after 4pm. Patchy fog between 7am and 10am. Otherwise, mostly cloudy, with a high near 79. South southeast wind around 8 mph becoming west northwest in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Showers
    Likely and
    Patchy Fog

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. North northeast wind 8 to 10 mph. Chance of precipitation is 30%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 60 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of drizzle, mainly between 2pm and 5pm. Mostly cloudy, with a high near 67. East northeast wind around 14 mph, with gusts as high as 23 mph.

    High: 67 °F

    Chance
    Drizzle

  • Sunday Night

    Sunday Night: A chance of showers with a slight chance of drizzle before 7pm, then a chance of showers after 7pm. Mostly cloudy, with a low around 55. East northeast wind 11 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 55 °F

    Chance
    Showers

  • Monday

    Monday: A 40 percent chance of showers. Mostly cloudy, with a high near 63. 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

Detailed Forecast

Overnight
Showers likely and possibly a thunderstorm. Patchy fog. Otherwise, cloudy, with a low around 66. South southeast wind around 9 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers and thunderstorms likely before 3pm, then showers likely and possibly a thunderstorm between 3pm and 4pm, then a chance of showers and thunderstorms after 4pm. Patchy fog between 7am and 10am. Otherwise, mostly cloudy, with a high near 79. South southeast wind around 8 mph becoming west northwest in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. North northeast wind 8 to 10 mph. Chance of precipitation is 30%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
A chance of drizzle, mainly between 2pm and 5pm. Mostly cloudy, with a high near 67. East northeast wind around 14 mph, with gusts as high as 23 mph.
Sunday Night
A chance of showers with a slight chance of drizzle before 7pm, then a chance of showers after 7pm. Mostly cloudy, with a low around 55. East northeast wind 11 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. 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. 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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ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IA
 42.49°N 92.35°W
Last Update:
2:06 am CDT Sep 19, 2026
Forecast Valid:
5am CDT Sep 19, 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