Knollwood, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Knollwood, a community in Lake County, Illinois.
This Afternoon
64°F
Slight Chance Rain Showers
A slight chance of drizzle before 2pm, then a slight chance of rain showers and a slight chance of drizzle. Mostly cloudy. High near 64, with temperatures falling to around 55 in the afternoon. Southwest wind around 15 mph, with gusts as high as 25 mph.
7-day forecast for Knollwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Slight Chance Rain Showers | 15 mph SW | 7% |
| Tonight | 45°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph SW | 13% |
| Thursday | 54°F | Rain Likely | 10 to 15 mph W | 67% |
| Thursday Night | 37°F | Chance Rain then Cloudy | 10 to 15 mph NNW | 53% |
| Friday | 50°F | Partly Sunny | 10 to 15 mph NNW | 6% |
| Friday Night | 35°F | Partly Cloudy | 5 to 10 mph NNW | 1% |
| Saturday | 51°F | Mostly Sunny | 5 mph NW | 1% |
| Saturday Night | 35°F | Partly Cloudy | 0 to 5 mph W | 0% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 6% |
| Sunday Night | 36°F | Mostly Clear | 5 mph W | 1% |
| Monday | 59°F | Mostly Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 41°F | Partly Cloudy | 5 mph WSW | 1% |
| Tuesday | 60°F | Sunny | 5 mph WNW | 1% |
| Tuesday Night | 40°F | Partly Cloudy | 0 mph | 2% |
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 4, 2026.