Algonquin, IL Weather & Growing Conditions
Overnight
59°F
Rain Showers Likely
Rain showers likely. Cloudy. Low around 59, with temperatures rising to around 62 overnight. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Rain Showers Likely | 15 mph S | 61% |
| Wednesday | 63°F | Scattered Rain Showers then Patchy Drizzle | 15 mph SSW | 29% |
| Wednesday Night | 47°F | Patchy Drizzle | 15 mph SW | 15% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph WSW | 35% |
| Thursday Night | 39°F | Chance Rain Showers then Cloudy | 10 mph NW | 50% |
| Friday | 49°F | Mostly Cloudy | 10 to 15 mph NNW | 12% |
| Friday Night | 32°F | Partly Cloudy | 0 to 10 mph NNW | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Partly Cloudy | 0 to 5 mph W | 0% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 6% |
| Sunday Night | 34°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 60°F | Sunny | 0 to 10 mph WSW | 0% |
| Monday Night | 39°F | Partly Cloudy | 5 mph WSW | 1% |
| Tuesday | 61°F | Sunny | 5 mph WNW | 0% |
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 Nov 4, 2026.