Frankfort, 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 | 1% |
| Tonight | 65°F | Partly Cloudy | 5 mph S | 5% |
| Wednesday | 81°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 mph SW | 46% |
| Wednesday Night | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph SW | 85% |
| Thursday | 78°F | Showers And Thunderstorms Likely | 5 mph S | 85% |
| Thursday Night | 62°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 46% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SSW | 6% |
| Friday Night | 63°F | Mostly Clear | 0 to 5 mph SSW | 9% |
| Saturday | 83°F | Mostly Sunny | 5 to 10 mph SSW | 11% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 15% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 15% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 10 mph SSW | 38% |
| Monday | 84°F | Chance Rain Showers | 5 to 10 mph SSW | 38% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 10 mph WSW | 43% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Frankfort, IL
Last spring frost
Apr 23
First fall frost
Oct 20
Growing season
179 days
Hardiness zone
6a
Explore more for Frankfort, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Park Forest, Il (8.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.