Princeton, IA Weather & Growing Conditions
Today
86°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 86. Southwest wind around 10 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 10 mph SW | 16% |
| Tonight | 68°F | Showers And Thunderstorms Likely | 5 mph N | 84% |
| Wednesday | 78°F | Showers And Thunderstorms Likely | 5 mph NW | 75% |
| Wednesday Night | 62°F | Showers And Thunderstorms Likely | 5 mph N | 73% |
| Thursday | 80°F | Chance Rain Showers then Mostly Sunny | 5 mph NE | 42% |
| Thursday Night | 62°F | Mostly Clear | 0 mph | 7% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph S | 8% |
| Saturday | 85°F | Sunny | 5 to 10 mph S | 11% |
| Saturday Night | 71°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 19% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 mph SW | 19% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 37% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 37% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph W | 35% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Princeton, IA
Last spring frost
Apr 16
First fall frost
Oct 25
Growing season
190 days
Hardiness zone
5b
Explore more for Princeton, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Le Claire L&D 14, Ia (8.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.