National Weather Service Forecast for: Ottumwa IA
Issued by: National Weather Service Des Moines, IA
Updated: 8:07 pm CDT Jun 18, 2026
 
Tonight

Tonight: A 20 percent chance of showers and thunderstorms before 11pm. Mostly clear, with a low around 56. Light west northwest wind.
Slight Chance
T-storms then
Mostly Clear
 Juneteenth

Juneteenth: Increasing clouds, with a high near 82. Calm wind becoming west northwest 5 to 7 mph in the afternoon.
Increasing
Clouds

 Friday
Night
Friday Night: A 20 percent chance of showers and thunderstorms after 10pm. Partly cloudy, with a low around 61. West northwest wind around 5 mph becoming calm in the evening.
Slight Chance
T-storms

 Saturday

Saturday: Mostly sunny, with a high near 83. Calm wind becoming north northwest around 6 mph in the afternoon.
Mostly Sunny

 Saturday
Night
Saturday Night: A slight chance of showers and thunderstorms before 1am, then showers likely between 1am and 4am, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 62. East wind 5 to 8 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Slight Chance
T-storms then
Showers
Likely
 Sunday

Sunday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 75. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Heavy Rain

 Sunday
Night
Sunday Night: A 40 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 57.
Chance
Showers

 Monday

Monday: Mostly sunny, with a high near 76.
Mostly Sunny

 Monday
Night
Monday Night: Partly cloudy, with a low around 56.
Partly Cloudy
Lo 56 °F Hi 82 °F Lo 61 °F Hi 83 °F Lo 62 °F Hi 75 °F Lo 57 °F Hi 76 °F Lo 56 °F

Hazardous Weather Outlook
 

Tonight
 
 A 20 percent chance of showers and thunderstorms before 11pm. Mostly clear, with a low around 56. Light west northwest wind.
Juneteenth
 
 Increasing clouds, with a high near 82. Calm wind becoming west northwest 5 to 7 mph in the afternoon.
Friday Night
 
 A 20 percent chance of showers and thunderstorms after 10pm. Partly cloudy, with a low around 61. West northwest wind around 5 mph becoming calm in the evening.
Saturday
 
 Mostly sunny, with a high near 83. Calm wind becoming north northwest around 6 mph in the afternoon.
Saturday Night
 
 A slight chance of showers and thunderstorms before 1am, then showers likely between 1am and 4am, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 62. East wind 5 to 8 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
 
 Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 75. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
 
 A 40 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 57.
Monday
 
 Mostly sunny, with a high near 76.
Monday Night
 
 Partly cloudy, with a low around 56.
Tuesday
 
 Mostly sunny, with a high near 79.
Tuesday Night
 
 Partly cloudy, with a low around 59.
Wednesday
 
 Mostly sunny, with a high near 80.
Wednesday Night
 
 Mostly clear, with a low around 58.
Thursday
 
 Mostly sunny, with a high near 80.

 

Forecast from NOAA-NWS for Ottumwa IA.