Crystal Lake, IA Weather & Growing Conditions
This Afternoon
45°F
Chance Rain Showers
A chance of rain showers. Cloudy, with a high near 45. West wind around 16 mph, with gusts as high as 24 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 45°F | Chance Rain Showers | 16 mph W | 46% |
| Tonight | 40°F | Rain Showers Likely | 13 to 16 mph WNW | 57% |
| Thursday | 47°F | Slight Chance Rain Showers then Cloudy | 13 to 18 mph NNW | 24% |
| Thursday Night | 30°F | Mostly Cloudy | 5 to 12 mph N | 1% |
| Friday | 44°F | Mostly Sunny | 5 mph NNE | 0% |
| Friday Night | 25°F | Partly Cloudy | 1 mph N | 0% |
| Saturday | 50°F | Mostly Sunny | 2 to 8 mph SW | 0% |
| Saturday Night | 32°F | Mostly Clear | 6 mph WSW | 0% |
| Sunday | 56°F | Sunny | 6 mph W | 0% |
| Sunday Night | 34°F | Clear | 6 mph SW | 0% |
| Monday | 63°F | Sunny | 7 to 12 mph SW | 0% |
| Monday Night | 36°F | Mostly Clear | 2 to 6 mph WNW | 0% |
| Tuesday | 58°F | Mostly Sunny | 2 to 6 mph NNW | 1% |
| Tuesday Night | 36°F | Partly Cloudy | 3 mph NNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Crystal Lake, IA
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
Explore more for Crystal Lake, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Britt 3E, Ia (8.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.