Algonquin, IL Weather & Growing Conditions
Overnight
62°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 4am, then showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy. Low around 62, with temperatures rising to around 64 overnight. East southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Showers And Thunderstorms Likely | 10 mph ESE | 98% |
| Saturday | 76°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph SE | 100% |
| Saturday Night | 62°F | Showers And Thunderstorms | 5 to 10 mph ENE | 94% |
| Sunday | 68°F | Showers And Thunderstorms Likely | 10 to 15 mph NNE | 56% |
| Sunday Night | 55°F | Slight Chance Rain Showers | 15 mph NE | 19% |
| Monday | 63°F | Chance Rain Showers | 15 mph ENE | 27% |
| Monday Night | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 17% |
| Tuesday | 62°F | Mostly Cloudy | 10 to 15 mph NE | 13% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 6% |
| Wednesday | 64°F | Partly Sunny | 5 to 10 mph NE | 10% |
| Wednesday Night | 51°F | Mostly Cloudy | 5 mph NNE | 4% |
| Thursday | 66°F | Partly Sunny | 5 mph NNE | 5% |
| Thursday Night | 52°F | Mostly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph NE | 5% |
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 Sep 19, 2026.