Princeton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Princeton, a city in Bureau County, Illinois.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. Southwest wind 5 to 10 mph.
7-day forecast for Princeton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 5 to 10 mph SW | 1% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 5 mph S | 46% |
| Wednesday | 80°F | Showers And Thunderstorms Likely | 5 mph SW | 61% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 0 to 5 mph N | 85% |
| Thursday | 79°F | Chance Showers And Thunderstorms | 0 to 5 mph NE | 58% |
| Thursday Night | 62°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph E | 23% |
| Friday | 82°F | Mostly Sunny | 0 mph | 10% |
| Friday Night | 65°F | Mostly Clear | 0 mph | 10% |
| Saturday | 85°F | Mostly Sunny | 5 mph SW | 8% |
| Saturday Night | 69°F | Mostly Clear | 5 to 10 mph S | 13% |
| Sunday | 87°F | Mostly Sunny | 10 to 15 mph SW | 13% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 33% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 33% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph SW | 37% |
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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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 Aug 4, 2026.