Princeton, IA Weather & Growing Conditions
Tonight
53°F
Mostly Cloudy
Mostly cloudy. Low around 53, with temperatures rising to around 56 overnight. South wind 10 to 15 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Mostly Cloudy | 10 to 15 mph S | 9% |
| Wednesday | 56°F | Chance Rain Showers | 15 mph SW | 29% |
| Wednesday Night | 46°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph SW | 16% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph W | 43% |
| Thursday Night | 41°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph NW | 15% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 5% |
| Friday Night | 32°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 52°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 34°F | Mostly Clear | 5 mph W | 2% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 2% |
| Sunday Night | 36°F | Clear | 5 mph W | 1% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 63°F | Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.