Crystal Lake, IL Weather & Growing Conditions
Today
63°F
Slight Chance Drizzle then Slight Chance Rain Showers
A slight chance of drizzle before 1pm, then a slight chance of rain showers and a slight chance of drizzle. Mostly cloudy. High near 63, with temperatures falling to around 55 in the afternoon. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 63°F | Slight Chance Drizzle then Slight Chance Rain Showers | 15 mph SW | 18% |
| Tonight | 46°F | Slight Chance Rain Showers then Cloudy | 10 to 15 mph SW | 12% |
| Thursday | 54°F | Rain Likely | 10 to 15 mph W | 63% |
| Thursday Night | 38°F | Chance Rain then Mostly Cloudy | 10 mph NNW | 34% |
| Friday | 48°F | Partly Sunny | 10 to 15 mph NNW | 1% |
| Friday Night | 32°F | Partly Cloudy | 0 to 10 mph NNW | 0% |
| Saturday | 50°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 5 mph W | 0% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 6% |
| 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 | 60°F | Sunny | 5 mph WNW | 0% |
| Tuesday Night | 39°F | Partly Cloudy | 0 mph | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Crystal Lake, IL
Last spring frost
Apr 25
First fall frost
Oct 22
Growing season
179 days
Hardiness zone
5b
Explore more for Crystal Lake, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Crystal Lake 4Nw, Il (4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.