Algonquin, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Algonquin, a village in Mchenry County, Illinois.
Overnight
63°F
Mostly Clear
Mostly clear, with a low around 63. South southwest wind around 5 mph.
7-day forecast for Algonquin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Mostly Clear | 5 mph SSW | 0% |
| Tuesday | 83°F | Mostly Sunny | 5 to 10 mph SSW | 1% |
| Tuesday Night | 66°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 52% |
| Wednesday | 78°F | Showers And Thunderstorms Likely | 0 to 5 mph WSW | 74% |
| Wednesday Night | 62°F | Showers And Thunderstorms | 0 to 5 mph NW | 81% |
| Thursday | 78°F | Rain Showers Likely then Slight Chance Showers And Thunderstorms | 0 to 5 mph NE | 55% |
| Thursday Night | 60°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph ENE | 16% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph S | 4% |
| Friday Night | 62°F | Partly Cloudy | 0 to 5 mph SSW | 8% |
| Saturday | 83°F | Mostly Sunny | 0 to 5 mph SW | 11% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 20% |
| Sunday | 84°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 20% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 44% |
| Monday | 83°F | Chance Showers And Thunderstorms | 5 mph SSW | 44% |
Forecast source: National Weather Service (api.weather.gov) for Algonquin (42.159, -88.322). Updated through the day.
Growing snapshot for Algonquin
Last spring frost
Apr 26
First fall frost
Oct 18
Growing season
174 days
Hardiness zone
5b
More local growing data for Algonquin: nearby ZIP 60102 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Bull Valley
Cary
Chemung
Coral
Crystal Lake
Fox River Grove
Franklinville
Greenwood
Harmony
Hartland
Harvard
Hebron
Huntley
Johnsburg
Lake Barrington
Lake in the Hills
Lakemoor
Lakewood
Lawrence
Marengo
McCullom Lake
McHenry
Oakwood Hills
Prairie Grove
Richmond
Ridgefield
Riley
Ringwood
Solon Mills
Spring Grove
Climate data from the nearest NOAA station, Elgin, Il (7 mi from Algonquin). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.