Prophetstown, IL Weather & Growing Conditions
Today
81°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Southeast wind around 10 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Chance Showers And Thunderstorms | 10 mph SE | 35% |
| Tonight | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 91% |
| Sunday | 71°F | Rain Showers Likely | 10 to 15 mph NE | 74% |
| Sunday Night | 57°F | Chance Rain Showers | 15 mph NE | 43% |
| Monday | 65°F | Chance Rain Showers | 15 mph NE | 53% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 40% |
| Tuesday | 64°F | Slight Chance Rain Showers then Partly Sunny | 15 mph NE | 17% |
| Tuesday Night | 49°F | Partly Cloudy | 5 to 15 mph NE | 7% |
| Wednesday | 67°F | Mostly Sunny | 5 to 10 mph NE | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 69°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 53°F | Partly Cloudy | 5 mph NE | 5% |
| Friday | 72°F | Mostly Sunny | 5 mph NE | 4% |
| Friday Night | 53°F | Partly Cloudy | 5 mph NE | 4% |
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 Sep 19, 2026.