Round Lake Beach, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Round Lake Beach, a village in Lake County, Illinois.
This Afternoon
67°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy, with a high near 67. East wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Round Lake Beach
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Showers And Thunderstorms Likely | 5 mph E | 72% |
| Tonight | 62°F | Showers And Thunderstorms | 5 to 10 mph ENE | 99% |
| Sunday | 66°F | Showers And Thunderstorms | 10 to 20 mph NE | 84% |
| Sunday Night | 55°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph NE | 16% |
| Monday | 63°F | Chance Rain Showers | 15 mph ENE | 31% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph ENE | 29% |
| Tuesday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 29% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 15 mph NE | 14% |
| Wednesday | 63°F | Slight Chance Rain Showers | 5 to 10 mph NE | 16% |
| Wednesday Night | 52°F | Mostly Cloudy | 0 to 10 mph NE | 6% |
| Thursday | 66°F | Partly Sunny | 0 to 5 mph NE | 5% |
| Thursday Night | 53°F | Mostly Cloudy | 0 to 5 mph NNE | 12% |
| Friday | 70°F | Partly Sunny | 0 to 5 mph NE | 11% |
| Friday Night | 53°F | Partly Cloudy | 0 to 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Round Lake Beach (42.382, -88.081). Updated through the day.
Growing snapshot for Round Lake Beach
Last spring frost
Apr 24
First fall frost
Oct 23
Growing season
180 days
Hardiness zone
5b
More local growing data for Round Lake Beach: nearby ZIP 60073 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
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Buffalo Grove
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Climate data from the nearest NOAA station, Lake Villa 2Ne, Il (5.7 mi from Round Lake Beach). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.