Knollwood, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Knollwood, a community in Lake County, Illinois.
This Afternoon
70°F
Chance Rain
A chance of rain before 3pm, then a chance of rain and a slight chance of thunderstorms. Mostly cloudy. High near 70, with temperatures falling to around 67 in the afternoon. South wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Knollwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Chance Rain | 15 to 20 mph S | 40% |
| Tonight | 60°F | Rain | 15 mph S | 76% |
| Wednesday | 64°F | Rain Likely | 15 mph SSW | 62% |
| Wednesday Night | 48°F | Mostly Cloudy | 15 mph SW | 14% |
| Thursday | 56°F | Chance Rain | 10 to 15 mph WSW | 36% |
| Thursday Night | 41°F | Rain Likely | 10 to 15 mph WNW | 63% |
| Friday | 52°F | Chance Rain | 15 mph N | 33% |
| Friday Night | 36°F | Mostly Cloudy | 5 to 10 mph NNW | 12% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 8% |
| Saturday Night | 36°F | Partly Cloudy | 0 to 5 mph WSW | 7% |
| Sunday | 56°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 17% |
| Sunday Night | 37°F | Mostly Clear | 5 mph WNW | 9% |
| Monday | 58°F | Mostly Sunny | 5 to 10 mph W | 4% |
| Monday Night | 40°F | Mostly Clear | 5 to 10 mph W | 3% |
Forecast source: National Weather Service (api.weather.gov) for Knollwood (42.285, -87.879). Updated through the day.
Growing snapshot for Knollwood
Last spring frost
Apr 30
First fall frost
Oct 19
Growing season
170 days
Hardiness zone
6a
More local growing data for Knollwood: nearby ZIP 60044 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Waukegan, Il (4.4 mi from Knollwood). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.