Pontiac, IL Weather & Growing Conditions
This Afternoon
78°F
Partly Sunny
Partly sunny, with a high near 78. East wind around 10 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Partly Sunny | 10 mph E | 13% |
| Tonight | 66°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph ESE | 17% |
| Saturday | 85°F | Chance Showers And Thunderstorms | 5 to 10 mph SSE | 49% |
| Saturday Night | 68°F | Showers And Thunderstorms Likely | 5 mph WNW | 69% |
| Sunday | 75°F | Showers And Thunderstorms Likely | 5 to 15 mph NNE | 71% |
| Sunday Night | 57°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 69% |
| Monday | 67°F | Showers And Thunderstorms Likely | 10 to 15 mph ENE | 67% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 41% |
| Tuesday | 66°F | Chance Rain Showers | 10 mph NE | 26% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 10 mph NNE | 8% |
| Wednesday | 69°F | Partly Sunny | 5 to 10 mph NNE | 5% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph NNE | 5% |
| Thursday | 71°F | Mostly Sunny | 0 to 5 mph N | 2% |
| Thursday Night | 53°F | Partly Cloudy | 0 to 5 mph NNE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Pontiac, IL
Last spring frost
Apr 16
First fall frost
Oct 24
Growing season
191 days
Hardiness zone
6a
Explore more for Pontiac, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Pontiac, Il (0.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.