Prophetstown, IL Weather & Growing Conditions
Overnight
53°F
Slight Chance Rain Showers
A slight chance of rain showers. Mostly cloudy. Low around 53, with temperatures rising to around 59 overnight. Southwest wind around 15 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Slight Chance Rain Showers | 15 mph SW | 17% |
| Wednesday | 57°F | Slight Chance Rain Showers | 15 mph SW | 24% |
| Wednesday Night | 46°F | Mostly Cloudy | 10 to 15 mph SW | 13% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph W | 42% |
| Thursday Night | 41°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph NW | 20% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 7% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 57°F | Sunny | 5 to 10 mph W | 2% |
| Sunday Night | 35°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 | 63°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Prophetstown, IL
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
167 days
Hardiness zone
5b
Explore more for Prophetstown, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Morrison, Il (12.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.