Crystal Lake, IA Weather & Growing Conditions
Today
49°F
Rain Showers Likely
Rain showers likely. Cloudy. High near 49, with temperatures falling to around 47 in the afternoon. West wind around 17 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 49°F | Rain Showers Likely | 17 mph W | 57% |
| Tonight | 40°F | Rain Showers Likely | 12 to 15 mph WNW | 58% |
| Thursday | 48°F | Chance Rain Showers then Cloudy | 13 to 17 mph NNW | 32% |
| Thursday Night | 32°F | Mostly Cloudy | 5 to 12 mph N | 6% |
| Friday | 46°F | Mostly Sunny | 2 to 6 mph NNE | 2% |
| Friday Night | 26°F | Partly Cloudy | 1 mph NE | 1% |
| Saturday | 49°F | Mostly Sunny | 1 to 7 mph SW | 0% |
| Saturday Night | 32°F | Mostly Clear | 5 mph W | 1% |
| Sunday | 55°F | Sunny | 7 mph W | 1% |
| Sunday Night | 34°F | Mostly Clear | 6 mph SW | 0% |
| Monday | 61°F | Sunny | 7 to 12 mph SW | 0% |
| Monday Night | 37°F | Mostly Clear | 2 to 6 mph WNW | 0% |
| Tuesday | 58°F | Mostly Sunny | 5 mph NW | 0% |
| Tuesday Night | 38°F | Partly Cloudy | 3 mph NE | 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.