Pontiac, IL Weather & Growing Conditions
This Afternoon
79°F
Chance Rain Showers
A chance of rain showers. Cloudy. High near 79, with temperatures falling to around 77 in the afternoon. South wind around 5 mph, with gusts as high as 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Chance Rain Showers | 5 mph S | 13% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 0 to 5 mph E | 52% |
| Sunday | 74°F | Showers And Thunderstorms Likely | 0 to 10 mph NE | 67% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms | 10 mph NE | 51% |
| Monday | 66°F | Rain Showers Likely | 10 to 15 mph ENE | 62% |
| Monday Night | 53°F | Chance Rain Showers | 10 mph ENE | 51% |
| Tuesday | 65°F | Chance Rain Showers | 10 mph NE | 51% |
| Tuesday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 21% |
| Wednesday | 67°F | Partly Sunny | 5 to 10 mph NNE | 9% |
| Wednesday Night | 53°F | Mostly Cloudy | 0 to 10 mph NNE | 3% |
| Thursday | 70°F | Partly Sunny | 5 mph NNE | 2% |
| Thursday Night | 54°F | Mostly Cloudy | 0 to 5 mph NNE | 8% |
| Friday | 73°F | Partly Sunny | 0 to 5 mph NNE | 4% |
| Friday Night | 53°F | Partly Cloudy | 0 to 5 mph NE | 4% |
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 20, 2026.