Round Lake, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Round Lake, a village in Lake County, Illinois.
Tonight
59°F
Rain
Rain. 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 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Round Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Rain | 15 mph S | 79% |
| Wednesday | 64°F | Rain Likely then Rain Showers Likely | 15 mph SSW | 61% |
| Wednesday Night | 47°F | Mostly Cloudy then Slight Chance Rain Showers | 15 mph SW | 22% |
| Thursday | 57°F | Chance Rain Showers | 10 to 15 mph WSW | 43% |
| Thursday Night | 40°F | Rain Showers Likely | 5 to 10 mph NW | 56% |
| Friday | 52°F | Slight Chance Rain Showers | 10 to 15 mph N | 24% |
| Friday Night | 34°F | Mostly Cloudy | 0 to 5 mph NNW | 7% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 6% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 5 mph WSW | 7% |
| Sunday | 57°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 17% |
| Sunday Night | 35°F | Mostly Clear | 0 to 5 mph W | 8% |
| Monday | 60°F | Mostly Sunny | 5 to 10 mph WSW | 3% |
| Monday Night | 39°F | Mostly Clear | 5 mph W | 2% |
| Tuesday | 61°F | Mostly Sunny | 5 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Round Lake (42.343, -88.102). Updated through the day.
Growing snapshot for Round Lake
Last spring frost
Apr 24
First fall frost
Oct 23
Growing season
180 days
Hardiness zone
5b
More local growing data for Round Lake: nearby ZIP 60073 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Antioch
Bannockburn
Beach Park
Buffalo Grove
Burtons Bridge
Deer Park
Deerfield
Forest Lake
Fox Lake
Fox Lake Hills
Gages Lake
Grandwood Park
Grayslake
Green Oaks
Gurnee
Hainesville
Hawthorn Woods
Highland Park
Highwood
Holiday Hills
Indian Creek
Island Lake
Kildeer
Knollwood
Lake Bluff
Lake Forest
Lake Villa
Lake Zurich
Libertyville
Lincolnshire
Climate data from the nearest NOAA station, Lake Villa 2Ne, Il (5.7 mi from Round Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.