Pontiac, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pontiac, a city in Livingston County, Illinois.
Overnight
67°F
Mostly Cloudy
Mostly cloudy, with a low around 67. Southeast wind around 5 mph, with gusts as high as 15 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Pontiac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 67°F | Mostly Cloudy | 5 mph SE | 14% |
| Saturday | 84°F | Showers And Thunderstorms Likely | 5 mph ESE | 63% |
| Saturday Night | 67°F | Showers And Thunderstorms Likely | 0 to 5 mph SSW | 67% |
| Sunday | 74°F | Showers And Thunderstorms | 0 to 10 mph N | 76% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 52% |
| Monday | 66°F | Rain Showers Likely | 10 to 15 mph ENE | 60% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 47% |
| Tuesday | 65°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 10 to 15 mph NE | 29% |
| Tuesday Night | 51°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 10 mph NNE | 20% |
| Wednesday | 68°F | Mostly Sunny | 5 to 10 mph NNE | 7% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NNE | 2% |
| Thursday | 70°F | Partly Sunny | 5 mph NNE | 3% |
| Thursday Night | 53°F | Mostly Cloudy | 0 to 5 mph NNE | 3% |
| Friday | 73°F | Mostly Sunny | 0 to 5 mph NE | 3% |
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 Sep 19, 2026.