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

Hazardous Weather Conditions

Current conditions at

Oelwein Municipal Airport (KOLZ)

Lat: 42.68°NLon: 91.98°WElev: 1070ft.

Overcast

59°F

15°C

Humidity 68%
Wind Speed SE 12 mph
Barometer 29.84 in
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 15 May 1:55 am CDT
Extended Forecast for

Sumner IA

  • Overnight

    Overnight: Partly cloudy, with a low around 55. South wind around 11 mph, with gusts as high as 22 mph.

    Low: 55 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 84. South wind 11 to 15 mph, with gusts as high as 21 mph.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly before midnight. Increasing clouds, with a low around 57. South wind 5 to 15 mph becoming north northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 57 °F

    T-storms
    Likely

  • Saturday

    Saturday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 82. Northwest wind 5 to 8 mph becoming northeast in the afternoon. Chance of precipitation is 20%.

    High: 82 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 58. East southeast wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 58 °F

    Chance
    T-storms then
    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Windy. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 84 °F

    Showers
    Likely and
    Windy

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 63. Windy. Chance of precipitation is 70%.

    Low: 63 °F

    Chance
    T-storms and
    Windy then
    Showers
    Likely and
    Breezy

  • Monday

    Monday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Windy. Chance of precipitation is 70%.

    High: 84 °F

    Showers
    Likely and
    Windy

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 1am, then showers likely. Low around 59. Windy. Chance of precipitation is 80%.

    Low: 59 °F

    Showers and
    Windy

Detailed Forecast

Overnight
Partly cloudy, with a low around 55. South wind around 11 mph, with gusts as high as 22 mph.
Friday
Sunny, with a high near 84. South wind 11 to 15 mph, with gusts as high as 21 mph.
Friday Night
Showers and thunderstorms likely, mainly before midnight. Increasing clouds, with a low around 57. South wind 5 to 15 mph becoming north northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 82. Northwest wind 5 to 8 mph becoming northeast in the afternoon. Chance of precipitation is 20%.
Saturday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 58. East southeast wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers likely and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Windy. 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 and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 63. Windy. Chance of precipitation is 70%.
Monday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Windy. Chance of precipitation is 70%.
Monday Night
Showers and possibly a thunderstorm before 1am, then showers likely. Low around 59. Windy. Chance of precipitation is 80%.
Tuesday
A 30 percent chance of showers before 1pm. Mostly cloudy, with a high near 74. Windy.
Tuesday Night
Mostly cloudy, with a low around 45. Windy.
Wednesday
Mostly sunny, with a high near 64.
Wednesday Night
Partly cloudy, with a low around 44.
Thursday
Mostly sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sumner IA
 42.83°N 92.1°W
Last Update:
1:51 am CDT May 15, 2026
Forecast Valid:
2am CDT May 15, 2026-6pm CDT May 21, 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