Rochester, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Rochester, a village in Sangamon County, Illinois.

Tonight

71°F

Mostly Cloudy

Mostly cloudy, with a low around 71. South southwest wind around 6 mph.

7-day forecast for Rochester

When	Temp	Forecast	Wind	Precip
Tonight	71°F	Mostly Cloudy	6 mph SSW	3%
Sunday	85°F	Chance Showers And Thunderstorms	5 to 10 mph NNW	34%
Sunday Night	61°F	Chance Showers And Thunderstorms	8 to 13 mph NE	61%
Monday	72°F	Showers And Thunderstorms Likely	10 mph ENE	65%
Monday Night	56°F	Chance Rain Showers	9 mph NE	46%
Tuesday	68°F	Chance Rain Showers	12 mph NE	46%
Tuesday Night	52°F	Mostly Cloudy	5 to 10 mph NNE	4%
Wednesday	70°F	Partly Sunny	6 to 9 mph NNE	3%
Wednesday Night	54°F	Mostly Cloudy	2 to 7 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	10%
Friday	76°F	Slight Chance Rain Showers	2 to 7 mph NE	15%
Friday Night	56°F	Slight Chance Rain Showers then Partly Cloudy	2 to 6 mph NE	15%
Saturday	78°F	Mostly Sunny	5 mph ENE	1%

Forecast source: National Weather Service (api.weather.gov) for Rochester (39.746, -89.567). Updated through the day.

Growing snapshot for Rochester

Last spring frost

Apr 15

First fall frost

Oct 22

Growing season

188 days

Hardiness zone

More local growing data for Rochester: nearby ZIP 62712 weather · frost dates · planting calendar · Illinois frost dates

Nearby towns & communities

Auburn Berlin Buffalo Cantrall Chatham Curran Dawson Divernon Grandview Illiopolis Jerome Leland Grove Loami Mechanicsburg New Berlin Pawnee Pleasant Plains Riverton Sherman Southern View Spaulding Springfield Thayer Williamsville

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Climate data from the nearest NOAA station, Springfield #2, Il (6.1 mi from Rochester). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.