 Now, from your 24-hour weather station, here's Southern Iowa's most accurate forecast on Ottumwa Radio. I'm meteorologist Megan Mulford with a look at your forecast. Slight chance of thunderstorms tonight, otherwise partly cloudy skies. Lows level off around 66. Southeast winds 10 to 15 miles an hour. A mix of clouds and sun again tomorrow. Chance of thunderstorms, high temperatures reach up to 88. Right now, it's 73 degrees.