Princeton, IL Weather & Growing Conditions
Today
59°F
Slight Chance Drizzle
A slight chance of drizzle. Cloudy. High near 59, with temperatures falling to around 56 in the afternoon. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 59°F | Slight Chance Drizzle | 10 to 15 mph SW | 11% |
| Tonight | 47°F | Slight Chance Rain Showers | 10 to 15 mph SW | 15% |
| Thursday | 52°F | Chance Rain Showers | 10 to 15 mph W | 33% |
| Thursday Night | 42°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 26% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 5% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 52°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 0 to 5 mph W | 1% |
| Sunday | 57°F | Sunny | 5 to 10 mph W | 3% |
| Sunday Night | 34°F | Clear | 0 to 5 mph W | 1% |
| Monday | 62°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 62°F | Sunny | 5 mph NW | 0% |
| Tuesday Night | 39°F | Partly Cloudy | 0 mph | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Princeton, IL
Last spring frost
Apr 22
First fall frost
Oct 17
Growing season
177 days
Hardiness zone
5b
Explore more for Princeton, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Princeton, Il (1.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.