Manhattan, IL Weather & Growing Conditions
This Afternoon
74°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy. High near 74, with temperatures falling to around 71 in the afternoon. South wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Chance Rain Showers | 15 to 20 mph S | 38% |
| Tonight | 60°F | Rain Showers | 15 mph S | 81% |
| Wednesday | 64°F | Chance Rain Showers then Mostly Cloudy | 15 mph SSW | 53% |
| Wednesday Night | 48°F | Mostly Cloudy | 15 mph SW | 8% |
| Thursday | 59°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph WSW | 17% |
| Thursday Night | 42°F | Chance Rain Showers | 5 to 10 mph WNW | 36% |
| Friday | 54°F | Slight Chance Rain Showers | 10 mph NNW | 23% |
| Friday Night | 35°F | Partly Cloudy | 5 to 10 mph NNW | 10% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 8% |
| Saturday Night | 33°F | Partly Cloudy | 0 mph | 3% |
| Sunday | 57°F | Mostly Sunny | 5 to 10 mph W | 11% |
| Sunday Night | 34°F | Mostly Clear | 5 mph WNW | 8% |
| Monday | 62°F | Sunny | 5 to 10 mph WSW | 4% |
| Monday Night | 38°F | Mostly Clear | 5 to 10 mph WSW | 2% |
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 Nov 4, 2026.