Algonquin, IL Weather & Growing Conditions
Overnight
63°F
Mostly Clear
Mostly clear, with a low around 63. South southwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Mostly Clear | 5 mph SSW | 0% |
| Tuesday | 84°F | Mostly Sunny | 5 to 10 mph SSW | 1% |
| Tuesday Night | 67°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 51% |
| 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 SSW | 4% |
| Friday Night | 63°F | Partly Cloudy | 0 to 5 mph SSW | 7% |
| 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). Updated through the day.
Growing snapshot for Algonquin, IL
Last spring frost
Apr 26
First fall frost
Oct 18
Growing season
174 days
Hardiness zone
5b
Explore more for Algonquin, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Elgin, Il (7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.