Pontiac, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pontiac, a city in Livingston County, Illinois.
Tonight
57°F
Rain Showers
Rain showers. Cloudy. Low around 57, with temperatures rising to around 61 overnight. South wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Pontiac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Rain Showers | 15 to 20 mph S | 87% |
| Wednesday | 62°F | Chance Rain Showers then Mostly Cloudy | 15 mph SW | 34% |
| Wednesday Night | 46°F | Mostly Cloudy | 10 mph SW | 6% |
| Thursday | 60°F | Partly Sunny | 10 to 15 mph WSW | 7% |
| Thursday Night | 42°F | Mostly Cloudy then Chance Rain Showers | 0 to 5 mph WNW | 33% |
| Friday | 55°F | Slight Chance Rain Showers | 5 to 10 mph NNW | 20% |
| Friday Night | 34°F | Mostly Cloudy | 0 to 10 mph NNW | 4% |
| Saturday | 54°F | Mostly Sunny | 0 to 5 mph WNW | 4% |
| Saturday Night | 32°F | Partly Cloudy | 0 mph | 3% |
| Sunday | 59°F | Sunny | 0 to 10 mph W | 12% |
| Sunday Night | 33°F | Mostly Clear | 0 to 5 mph W | 8% |
| Monday | 64°F | Sunny | 0 to 10 mph WSW | 3% |
| Monday Night | 38°F | Mostly Clear | 5 mph WSW | 3% |
| Tuesday | 66°F | Sunny | 5 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Pontiac (40.889, -88.641). Updated through the day.
Growing snapshot for Pontiac
Last spring frost
Apr 16
First fall frost
Oct 24
Growing season
191 days
Hardiness zone
6a
More local growing data for Pontiac: nearby ZIP 61764 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Campus
Chatsworth
Cornell
Cullom
Dwight
Emington
Fairbury
Flanagan
Forrest
Long Point
Odell
Saunemin
Strawn
Climate data from the nearest NOAA station, Pontiac, Il (0.7 mi from Pontiac). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.