Island Lake, IL Weather & Growing Conditions
Tonight
60°F
Mostly Cloudy then Showers And Thunderstorms Likely
Showers and thunderstorms likely after midnight. Mostly cloudy, with a low around 60. East wind 10 to 15 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Mostly Cloudy then Showers And Thunderstorms Likely | 10 to 15 mph E | 68% |
| Saturday | 75°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 to 15 mph ESE | 95% |
| Saturday Night | 62°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NE | 79% |
| Sunday | 67°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 73% |
| Sunday Night | 53°F | Chance Rain Showers | 15 mph ENE | 46% |
| Monday | 63°F | Chance Rain Showers | 15 mph ENE | 40% |
| Monday Night | 49°F | Chance Rain Showers | 5 to 15 mph ENE | 40% |
| Tuesday | 62°F | Slight Chance Rain Showers | 10 to 15 mph NE | 20% |
| Tuesday Night | 49°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 15% |
| Wednesday | 64°F | Partly Sunny | 5 to 10 mph NE | 10% |
| Wednesday Night | 50°F | Mostly Cloudy | 0 to 5 mph NNE | 4% |
| Thursday | 67°F | Partly Sunny | 0 to 5 mph NNE | 5% |
| Thursday Night | 51°F | Mostly Cloudy | 0 to 5 mph NNE | 5% |
| Friday | 69°F | Mostly Sunny | 0 to 5 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Island Lake, IL
Last spring frost
May 1
First fall frost
Oct 11
Growing season
162 days
Hardiness zone
5b
Explore more for Island Lake, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Mc Henry -Wg Stratton L&D, Il (3.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.