Pontiac, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pontiac, a city in Livingston County, Illinois.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph.
7-day forecast for Pontiac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
| Tonight | 66°F | Partly Cloudy | 5 mph S | 1% |
| Wednesday | 83°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 mph SSW | 42% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph WNW | 88% |
| Thursday | 81°F | Showers And Thunderstorms | 0 to 5 mph S | 83% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms | 0 mph | 35% |
| Friday | 83°F | Mostly Sunny | 0 mph | 9% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms | 0 mph | 21% |
| Saturday | 86°F | Mostly Sunny | 0 to 5 mph SSW | 11% |
| Saturday Night | 70°F | Mostly Clear | 0 to 5 mph SSW | 11% |
| Sunday | 88°F | Sunny | 5 to 10 mph SW | 11% |
| Sunday Night | 71°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 24% |
| Monday | 88°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 24% |
| Monday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph WSW | 32% |
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 Aug 4, 2026.