NWS Forecast for Ottumwa IA

National Weather Service Forecast for: Ottumwa IA
Issued by: National Weather Service Des Moines, IA

Updated: 10:43 pm CDT Jun 29, 2026

Tonight Partly Cloudy	Tuesday Sunny	Tuesday Night Mostly Clear	Wednesday Sunny	Wednesday Night Partly Cloudy	Thursday Mostly Sunny	Thursday Night Partly Cloudy then Slight Chance T-storms	Friday Slight Chance T-storms	Friday Night Partly Cloudy
Lo 77 °F	Hi 94 °F	Lo 75 °F	Hi 94 °F	Lo 76 °F	Hi 94 °F	Lo 74 °F	Hi 93 °F	Lo 73 °F

Hazardous Weather Outlook
Extreme Heat Warning

Tonight	Partly cloudy, with a low around 77. South wind 9 to 11 mph, with gusts as high as 20 mph.
Tuesday	Sunny, with a high near 94. Heat index values as high as 106. South southwest wind 9 to 15 mph, with gusts as high as 26 mph.
Tuesday Night	Mostly clear, with a low around 75. South southwest wind 9 to 13 mph, with gusts as high as 24 mph.
Wednesday	Sunny, with a high near 94. Heat index values as high as 101. South southwest wind 9 to 15 mph, with gusts as high as 26 mph.
Wednesday Night	Partly cloudy, with a low around 76. South southwest wind 9 to 14 mph, with gusts as high as 24 mph.
Thursday	Mostly sunny, with a high near 94.
Thursday Night	A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.
Friday	A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Friday Night	Partly cloudy, with a low around 73.
Independence Day	Mostly sunny, with a high near 93.
Saturday Night	A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Sunday	A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Sunday Night	A 30 percent chance of showers. Partly cloudy, with a low around 68.
Monday	Mostly sunny, with a high near 88.

Forecast from NOAA-NWS for Ottumwa IA.