Princeton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Princeton, a city in Bureau County, Illinois.
Overnight
54°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy. Low around 54, with temperatures rising to around 57 overnight. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
7-day forecast for Princeton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Chance Rain Showers | 10 mph S | 34% |
| Wednesday | 59°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph SW | 30% |
| Wednesday Night | 47°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph SW | 18% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph W | 38% |
| 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% |
Forecast source: National Weather Service (api.weather.gov) for Princeton (41.381, -89.464). Updated through the day.
Growing snapshot for Princeton
Last spring frost
Apr 22
First fall frost
Oct 17
Growing season
177 days
Hardiness zone
5b
More local growing data for Princeton: nearby ZIP 61356 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
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Neponset
New Bedford
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Wyanet
Climate data from the nearest NOAA station, Princeton, Il (1.7 mi from Princeton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.