Rochester, IL Weather & Growing Conditions
This Afternoon
90°F
Slight Chance Rain Showers
A slight chance of rain showers between 4pm and 5pm. Mostly cloudy, with a high near 90. West southwest wind around 6 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 90°F | Slight Chance Rain Showers | 6 mph WSW | 15% |
| Tonight | 70°F | Mostly Cloudy | 6 mph SSW | 6% |
| Sunday | 85°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 to 10 mph NNW | 34% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 9 to 13 mph NE | 61% |
| Monday | 72°F | Showers And Thunderstorms Likely | 12 mph ENE | 64% |
| Monday Night | 56°F | Chance Rain Showers | 8 to 12 mph ENE | 45% |
| Tuesday | 68°F | Chance Rain Showers | 12 mph NE | 45% |
| Tuesday Night | 53°F | Mostly Cloudy | 5 to 12 mph NNE | 4% |
| Wednesday | 70°F | Partly Sunny | 7 to 10 mph NNE | 3% |
| Wednesday Night | 54°F | Mostly Cloudy | 3 to 8 mph NNE | 0% |
| Thursday | 73°F | Partly Sunny | 3 to 7 mph NNE | 0% |
| Thursday Night | 57°F | Mostly Cloudy | 2 to 6 mph NNE | 1% |
| Friday | 76°F | Partly Sunny | 3 to 7 mph NE | 6% |
| Friday Night | 56°F | Partly Cloudy | 3 to 7 mph NE | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Rochester, IL
Last spring frost
Apr 15
First fall frost
Oct 22
Growing season
188 days
Hardiness zone
6a
Explore more for Rochester, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Springfield #2, Il (11 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.