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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

Current conditions at

Iowa City Municipal Airport (KIOW)

Lat: 41.64°NLon: 91.54°WElev: 650ft.

Overcast

68°F

20°C

Humidity 90%
Wind Speed NE 7 mph
Barometer 30.26 in (1024.1 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 17 Sep 11:52 pm CDT
Extended Forecast for

West Branch IA

  • Overnight

    Overnight: Mostly cloudy, with a low around 64. East wind around 5 mph.

    Low: 64 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 75. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.

    High: 75 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Low around 67. East wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 67 °F

    Slight Chance
    T-storms then
    Showers

  • Saturday

    Saturday: Showers and thunderstorms before noon, then a chance of showers between noon and 1pm, then a chance of showers and thunderstorms after 1pm. High near 82. Southeast wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 80%.

    High: 82 °F

    Showers then
    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm, then showers after 1am. Low around 65. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 65 °F

    Showers

  • Sunday

    Sunday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 70. 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: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.

    Low: 59 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: Showers likely, mainly before 1pm. Cloudy, with a high near 64. Chance of precipitation is 60%.

    High: 64 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Overnight
Mostly cloudy, with a low around 64. East wind around 5 mph.
Friday
A chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 75. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Friday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Low around 67. East wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers and thunderstorms before noon, then a chance of showers between noon and 1pm, then a chance of showers and thunderstorms after 1pm. High near 82. Southeast wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 80%.
Saturday Night
Showers likely and possibly a thunderstorm, then showers after 1am. Low around 65. 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 1pm. Mostly cloudy, with a high near 70. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.
Monday
Showers likely, mainly before 1pm. Cloudy, with a high near 64. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 55.
Tuesday
Mostly cloudy, with a high near 63.
Tuesday Night
Partly cloudy, with a low around 52.
Wednesday
Partly sunny, with a high near 68.
Wednesday Night
Partly cloudy, with a low around 56.
Thursday
Mostly sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
West Branch IA
 41.66°N 91.38°W (Elev. 797 ft)
Last Update:
11:41 pm CDT Sep 17, 2026
Forecast Valid:
12am CDT Sep 18, 2026-6pm CDT Sep 24, 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