Round Lake, IL Weather & Growing Conditions
Overnight
59°F
Rain Showers
Rain showers. Cloudy. Low around 59, with temperatures rising to around 63 overnight. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. 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 | 15 mph S | 81% |
| Wednesday | 64°F | Chance Rain Showers | 15 mph SSW | 37% |
| Wednesday Night | 46°F | Mostly Cloudy | 15 mph SW | 14% |
| Thursday | 56°F | Chance Rain Showers | 10 to 15 mph WSW | 52% |
| Thursday Night | 38°F | Chance Rain Showers then Cloudy | 10 to 15 mph NNW | 53% |
| Friday | 49°F | Mostly Cloudy | 10 to 15 mph NNW | 11% |
| Friday Night | 33°F | Partly Cloudy | 5 to 10 mph NNW | 1% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Partly Cloudy | 0 to 5 mph W | 0% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 6% |
| Sunday Night | 34°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 60°F | Mostly 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 Round Lake, IL
Last spring frost
Apr 24
First fall frost
Oct 23
Growing season
180 days
Hardiness zone
5b
Explore more for Round Lake, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Lake Villa 2Ne, Il (5.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.