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

Tonight: Mostly clear, with a low around 51. West northwest wind 3 to 5 mph.
Mostly Clear

 Juneteenth

Juneteenth: A 40 percent chance of showers and thunderstorms, mainly after 2pm. Increasing clouds, with a high near 77. Light west wind becoming west southwest 6 to 11 mph in the afternoon. Winds could gust as high as 21 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunny then
Chance
T-storms
 Friday
Night
Friday Night: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Mostly cloudy, then gradually becoming clear, with a low around 53. West wind 5 to 11 mph, with gusts as high as 21 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms then
Mostly Clear
 Saturday

Saturday: Sunny, with a high near 78. North northwest wind 3 to 6 mph.
Sunny

 Saturday
Night
Saturday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 56. Light and variable wind becoming east around 6 mph after midnight.
Mostly Cloudy
then Slight
Chance
Showers
 Sunday

Sunday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 70. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Showers
Likely

 Sunday
Night
Sunday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 53.
Slight Chance
Showers

 Monday

Monday: Mostly sunny, with a high near 74.
Mostly Sunny

 Monday
Night
Monday Night: Partly cloudy, with a low around 52.
Partly Cloudy
Lo 51 °F Hi 77 °F Lo 53 °F Hi 78 °F Lo 56 °F Hi 70 °F Lo 53 °F Hi 74 °F Lo 52 °F

Hazardous Weather Outlook
 

Tonight
 
 Mostly clear, with a low around 51. West northwest wind 3 to 5 mph.
Juneteenth
 
 A 40 percent chance of showers and thunderstorms, mainly after 2pm. Increasing clouds, with a high near 77. Light west wind becoming west southwest 6 to 11 mph in the afternoon. Winds could gust as high as 21 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
 
 A 30 percent chance of showers and thunderstorms, mainly before 8pm. Mostly cloudy, then gradually becoming clear, with a low around 53. West wind 5 to 11 mph, with gusts as high as 21 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
 
 Sunny, with a high near 78. North northwest wind 3 to 6 mph.
Saturday Night
 
 A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 56. Light and variable wind becoming east around 6 mph after midnight.
Sunday
 
 Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 70. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
 
 A 20 percent chance of showers. Mostly cloudy, with a low around 53.
Monday
 
 Mostly sunny, with a high near 74.
Monday Night
 
 Partly cloudy, with a low around 52.
Tuesday
 
 A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 76.
Tuesday Night
 
 A 40 percent chance of showers. Partly cloudy, with a low around 55.
Wednesday
 
 Mostly sunny, with a high near 77.
Wednesday Night
 
 Mostly clear, with a low around 53.
Thursday
 
 Sunny, with a high near 77.

 

Forecast from NOAA-NWS for Mason City IA.