National Weather Service Forecast for: Grinnell IA
Issued by: National Weather Service Des Moines, IA
Updated: 9:47 am CDT Jun 18, 2018

Grinnell
 
Today

Today: A 30 percent chance of showers and thunderstorms, mainly after 4pm.  Mostly sunny, with a high near 90. Southwest wind 8 to 11 mph.  New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Mostly Sunny
then Chance
T-storms
Tonight

Tonight: Showers and thunderstorms, mainly before 4am.  Low around 70. Southwest wind 5 to 7 mph becoming light and variable.  Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
T-storms
Likely then
T-storms
Tuesday

Tuesday: Showers and thunderstorms likely, mainly between 7am and 1pm.  Mostly cloudy, with a high near 83. South wind 6 to 8 mph.  Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
T-storms
Likely
Tuesday
Night
Tuesday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 66. Northeast wind 5 to 7 mph.  New rainfall amounts between a quarter and half of an inch possible.
Chance
T-storms
Wednesday

Wednesday: A 30 percent chance of showers and thunderstorms.  Cloudy, with a high near 77. East northeast wind 6 to 10 mph.  New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms
Wednesday
Night
Wednesday Night: Showers and thunderstorms likely, mainly after 1am.  Cloudy, with a low around 63. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
T-storms
Likely
Thursday

Thursday: Showers and thunderstorms likely.  Cloudy, with a high near 74. Chance of precipitation is 70%.
T-storms
Likely
Thursday
Night
Thursday Night: Showers and thunderstorms likely.  Cloudy, with a low around 63. Chance of precipitation is 70%.
T-storms
Likely
Friday

Friday: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 76.
Chance
T-storms
Hi 90 °F Lo 70 °F Hi 83 °F Lo 66 °F Hi 77 °F Lo 63 °F Hi 74 °F Lo 63 °F Hi 76 °F

Heat Advisory
Hazardous Weather Outlook
 

Today
 
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 90. Southwest wind 8 to 11 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
 
Showers and thunderstorms, mainly before 4am. Low around 70. Southwest wind 5 to 7 mph becoming light and variable. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
 
Showers and thunderstorms likely, mainly between 7am and 1pm. Mostly cloudy, with a high near 83. South wind 6 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
 
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Northeast wind 5 to 7 mph. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
 
A 30 percent chance of showers and thunderstorms. Cloudy, with a high near 77. East northeast wind 6 to 10 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
 
Showers and thunderstorms likely, mainly after 1am. Cloudy, with a low around 63. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
 
Showers and thunderstorms likely. Cloudy, with a high near 74. Chance of precipitation is 70%.
Thursday Night
 
Showers and thunderstorms likely. Cloudy, with a low around 63. Chance of precipitation is 70%.
Friday
 
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 76.
Friday Night
 
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 62.
Saturday
 
Partly sunny, with a high near 79.
Saturday Night
 
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Sunday
 
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.

 

Forecast from NOAA-NWS for Grinnell IA.