Manhattan, IL Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°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 | 5 mph SW | 45% |
| Wednesday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph WSW | 85% |
| Thursday | 78°F | Showers And Thunderstorms Likely | 0 to 5 mph S | 83% |
| Thursday Night | 62°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 47% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph S | 5% |
| Friday Night | 63°F | Mostly Clear | 0 mph | 9% |
| Saturday | 83°F | Mostly Sunny | 0 to 5 mph SSW | 11% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 15% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 5 to 10 mph SW | 15% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 35% |
| Monday | 85°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 35% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 41% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Manhattan, IL
Last spring frost
Apr 19
First fall frost
Oct 25
Growing season
188 days
Hardiness zone
6a
Explore more for Manhattan, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Joliet Brandon Rd Dam, Il (10.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.