Rochester, IL Weather & Growing Conditions

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

Today

87°F

Sunny

Sunny, with a high near 87. South wind around 6 mph.

7-day forecast for Rochester

When	Temp	Forecast	Wind	Precip
Today	87°F	Sunny	6 mph S	0%
Tonight	68°F	Mostly Clear	5 mph SSE	0%
Wednesday	87°F	Mostly Sunny then Slight Chance Showers And Thunderstorms	7 mph S	18%
Wednesday Night	68°F	Chance Showers And Thunderstorms	6 mph S	79%
Thursday	83°F	Showers And Thunderstorms	5 mph SSW	79%
Thursday Night	66°F	Slight Chance Showers And Thunderstorms	0 to 3 mph SSE	20%
Friday	85°F	Partly Sunny	2 mph SW	9%
Friday Night	67°F	Slight Chance Showers And Thunderstorms	2 mph SSW	23%
Saturday	87°F	Slight Chance Showers And Thunderstorms then Mostly Sunny	5 mph SSW	23%
Saturday Night	71°F	Mostly Clear	6 mph S	10%
Sunday	89°F	Sunny	7 to 10 mph SSW	4%
Sunday Night	73°F	Mostly Clear	9 mph S	11%
Monday	90°F	Mostly Sunny	9 mph SSW	13%
Monday Night	74°F	Slight Chance Showers And Thunderstorms	8 mph SSW	22%

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 Aug 4, 2026.