Chemung, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chemung, a community in Mchenry County, Illinois.
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. Southwest wind around 10 mph, with gusts as high as 20 mph.
7-day forecast for Chemung
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 10 mph SW | 3% |
| Tonight | 65°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 74% |
| Wednesday | 76°F | Showers And Thunderstorms Likely | 0 to 5 mph W | 74% |
| Wednesday Night | 60°F | Showers And Thunderstorms Likely | 0 to 5 mph N | 69% |
| Thursday | 78°F | Chance Rain Showers then Partly Sunny | 0 to 5 mph ENE | 37% |
| Thursday Night | 58°F | Partly Cloudy | 0 mph | 14% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SSE | 4% |
| Friday Night | 61°F | Mostly Clear | 0 to 5 mph SSW | 6% |
| Saturday | 83°F | Mostly Sunny | 0 to 10 mph SSW | 11% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 23% |
| Sunday | 84°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 23% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 44% |
| Monday | 83°F | Chance Rain Showers | 0 to 10 mph SSW | 44% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 5 mph NW | 44% |
Forecast source: National Weather Service (api.weather.gov) for Chemung (42.416, -88.664). Updated through the day.
Growing snapshot for Chemung
Last spring frost
Apr 28
First fall frost
Oct 12
Growing season
166 days
Hardiness zone
5b
More local growing data for Chemung: nearby ZIP 60033 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Marengo, Il (11 mi from Chemung). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.