Plainfield, IL Weather & Growing Conditions
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. South southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
| Tonight | 67°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 21% |
| Wednesday | 80°F | Chance Showers And Thunderstorms | 5 mph SW | 62% |
| Wednesday Night | 65°F | Showers And Thunderstorms | 5 mph WNW | 89% |
| Thursday | 79°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 74% |
| Thursday Night | 62°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 33% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph S | 5% |
| Friday Night | 64°F | Mostly Clear | 0 to 5 mph S | 9% |
| Saturday | 83°F | Mostly Sunny | 0 to 5 mph SSW | 11% |
| Saturday Night | 69°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 mph SSW | 15% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 5 to 10 mph SW | 15% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 36% |
| Monday | 85°F | Chance Rain Showers | 5 to 10 mph SSW | 36% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph NNE | 41% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Plainfield, IL
Last spring frost
Apr 20
First fall frost
Oct 22
Growing season
184 days
Hardiness zone
5b
Explore more for Plainfield, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Romeoville Wfo, Il (7.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.