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

Newton Municipal Airport - Earl Johnson Field (KTNU)

Lat: 41.67°NLon: 93.02°WElev: 945ft.

Fog/Mist

73°F

23°C

Humidity 100%
Wind Speed SE 8 mph
Barometer 29.94 in
Dewpoint 73°F (23°C)
Visibility 6.00 mi
Last update 18 Sep 11:15 pm CDT
Extended Forecast for

Newton IA

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly after midnight. Patchy fog. Otherwise, mostly cloudy, with a low around 69. Southeast wind 8 to 10 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Chance
    T-storms and
    Patchy Fog

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms, mainly between 3pm and 4pm. Mostly cloudy, with a high near 81. South southeast wind around 8 mph becoming west in the afternoon. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 81 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. North wind 6 to 8 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 63 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 68. Northeast wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 68 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Cloudy, with a low around 57. East northeast wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 57 °F

    Chance
    Showers

  • Monday

    Monday: Showers likely. Mostly cloudy, with a high near 61. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 61 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 60.

    High: 60 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 48.

    Low: 48 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 50 percent chance of showers and thunderstorms, mainly after midnight. Patchy fog. Otherwise, mostly cloudy, with a low around 69. Southeast wind 8 to 10 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A 50 percent chance of showers and thunderstorms, mainly between 3pm and 4pm. Mostly cloudy, with a high near 81. South southeast wind around 8 mph becoming west in the afternoon. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. North wind 6 to 8 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
A chance of showers before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 68. Northeast wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A chance of showers before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Cloudy, with a low around 57. East northeast wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
Showers likely. Mostly cloudy, with a high near 61. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 52.
Tuesday
Mostly cloudy, with a high near 60.
Tuesday Night
Partly cloudy, with a low around 48.
Wednesday
Mostly sunny, with a high near 65.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
Partly sunny, with a high near 67.
Thursday Night
Mostly cloudy, with a low around 55.
Friday
Mostly sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Newton IA
 41.69°N 93.04°W
Last Update:
10:01 pm CDT Sep 18, 2026
Forecast Valid:
11pm CDT Sep 18, 2026-6pm CDT Sep 25, 2026
 
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Additional Resources

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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