FPUS63 KDMX 182105 SFPIA IAZ001>099-191000- State Forecast for Iowa National Weather Service Des Moines IA 405 PM CDT Mon May 18 2026 .TONIGHT...Mostly cloudy. Chance of showers and thunderstorms. Lows 45 to 59. .TUESDAY...Mostly cloudy early in the morning then becoming partly cloudy. Slight chance of showers. Highs 57 to 67. .TUESDAY NIGHT...Partly cloudy early in the evening then clearing. Lows 36 to 44. .WEDNESDAY...Mostly sunny until late afternoon then becoming partly cloudy. Highs in the lower 60s. .THURSDAY...Partly cloudy. Chance of showers and slight chance of thunderstorms. Lows in the mid 40s. Highs 59 to 65. .FRIDAY...Mostly cloudy. Chance of thunderstorms. Lows 43 to 49. Highs in the mid 60s. .SATURDAY...Partly cloudy. Slight chance of thunderstorms. Lows 45 to 51. Highs in the lower 70s. $$ This forecast covers all of Iowa and is updated twice daily. Broad ranges in temperature depict high variability across the state. For location specific forecasts, please visit www.weather.gov. Please provide feedback on this product to nws.desmoines@noaa.gov.