Round Lake Heights, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Round Lake Heights, a village in Lake County, Illinois.
Today
64°F
Chance Rain then Slight Chance Rain Showers
A chance of rain before 11am, then a slight chance of drizzle between 11am and 2pm, then a slight chance of rain showers and a slight chance of drizzle. Mostly cloudy. High near 64, with temperatures falling to around 56 in the afternoon. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Round Lake Heights
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Chance Rain then Slight Chance Rain Showers | 15 mph SW | 29% |
| Tonight | 45°F | Slight Chance Rain Showers then Cloudy | 10 to 15 mph SW | 11% |
| Thursday | 55°F | Rain Likely | 10 to 15 mph W | 69% |
| Thursday Night | 37°F | Chance Rain then Mostly Cloudy | 10 to 15 mph NNW | 40% |
| Friday | 49°F | Partly Sunny | 10 to 15 mph NNW | 2% |
| Friday Night | 33°F | Partly Cloudy | 5 to 10 mph NNW | 0% |
| Saturday | 51°F | Sunny | 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 | 5% |
| Sunday Night | 35°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 60°F | Sunny | 0 to 10 mph WSW | 0% |
| Monday Night | 40°F | Partly Cloudy | 5 mph WSW | 1% |
| Tuesday | 61°F | Sunny | 5 mph WNW | 1% |
| Tuesday Night | 38°F | Partly Cloudy | 0 mph | 1% |
Forecast source: National Weather Service (api.weather.gov) for Round Lake Heights (42.385, -88.106). Updated through the day.
Growing snapshot for Round Lake Heights
Last spring frost
Apr 24
First fall frost
Oct 23
Growing season
180 days
Hardiness zone
5b
More local growing data for Round Lake Heights: nearby ZIP 60073 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Lake Villa 2Ne, Il (5.7 mi from Round Lake Heights). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.