| National Weather Service Forecast for:
Plainfield, IL Issued by: National Weather Service Chicago/Romeoville, IL |
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| Updated: 09/03/2026 3:01pm | ||||||||||||||||||||||||||||||||||||||||
| Westmont, Illinois | ||||||||||||||||||||||||||||||||||||||||
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Heat Advisory issued September 3 at 1:53PM CDT until September 3 at 9:00PM CDT
Heat Advisory issued September 3 at 10:14AM CDT until September 3 at 9:00PM CDT
| This Afternoon |
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Heat index values as high as 100. South wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible. |
| Tonight |
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 73. Heat index values as high as 98. South wind around 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible. |
| Friday |
A slight chance of showers and thunderstorms between 7am and 10am. Mostly sunny. High near 92, with temperatures falling to around 90 in the afternoon. Heat index values as high as 101. Southwest wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 20%. |
| Friday Night |
A chance of showers and thunderstorms between 7pm and 4am, then a chance of showers and thunderstorms. Mostly clear, with a low around 71. Heat index values as high as 98. South southeast wind around 5 mph. Chance of precipitation is 50%. |
| Saturday |
A chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm. Mostly sunny, with a high near 87. Northeast wind 5 to 10 mph. Chance of precipitation is 50%. |
| Saturday Night |
Partly cloudy, with a low around 66. |
| Sunday |
Mostly sunny, with a high near 83. |
| Sunday Night |
Partly cloudy, with a low around 62. |
| Labor Day |
Mostly sunny, with a high near 83. |
| Monday Night |
Partly cloudy, with a low around 64. |
| Tuesday |
A slight chance of rain showers after 1pm. Mostly sunny, with a high near 87. |
| Tuesday Night |
A chance of rain showers. Partly cloudy, with a low around 71. |
| Wednesday |
A chance of rain showers before 1pm. Mostly sunny, with a high near 89. |
| Wednesday Night |
A chance of rain showers after 7pm. Partly cloudy, with a low around 69. |
Forecast from NOAA-NWS for Plainfield, IL.