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.
This Afternoon
71°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a high near 71. East wind around 15 mph. Chance of precipitation is 30%.
7-day forecast for Round Lake Heights
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Chance Rain Showers | 15 mph E | 29% |
| Tonight | 60°F | Slight Chance Rain Showers then Showers And Thunderstorms Likely | 10 to 15 mph E | 75% |
| Saturday | 75°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 to 15 mph ESE | 96% |
| Saturday Night | 62°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NE | 78% |
| Sunday | 67°F | Showers And Thunderstorms Likely | 10 to 20 mph NE | 70% |
| Sunday Night | 55°F | Chance Rain Showers | 15 mph ENE | 42% |
| Monday | 64°F | Chance Rain Showers | 15 to 20 mph ENE | 38% |
| Monday Night | 51°F | Chance Rain Showers | 10 to 15 mph ENE | 38% |
| Tuesday | 63°F | Slight Chance Rain Showers | 10 to 15 mph NE | 20% |
| Tuesday Night | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 16% |
| Wednesday | 65°F | Partly Sunny | 5 to 10 mph NE | 11% |
| Wednesday Night | 51°F | Mostly Cloudy | 0 to 5 mph NNE | 4% |
| Thursday | 67°F | Partly Sunny | 0 to 5 mph NNE | 5% |
| Thursday Night | 52°F | Mostly Cloudy | 0 to 5 mph N | 4% |
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 Sep 18, 2026.