Clear Lake, IA Weather & Growing Conditions
Today
71°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms. Mostly cloudy. High near 71, with temperatures falling to around 69 in the afternoon. North northwest wind around 8 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 |
|---|---|---|---|---|
| Today | 71°F | Patchy Fog | 8 mph NNW | 49% |
| Tonight | 56°F | Slight Chance Rain Showers | 9 to 13 mph NNE | 21% |
| Sunday | 65°F | Mostly Cloudy | 15 mph NE | 9% |
| Sunday Night | 50°F | Chance Rain Showers | 13 mph ENE | 26% |
| Monday | 61°F | Chance Rain Showers | 9 to 13 mph ENE | 38% |
| Monday Night | 45°F | Chance Rain Showers | 5 to 8 mph ENE | 32% |
| Tuesday | 61°F | Mostly Sunny | 7 mph ENE | 11% |
| Tuesday Night | 42°F | Mostly Clear | 6 mph E | 0% |
| Wednesday | 64°F | Sunny | 5 mph E | 1% |
| Wednesday Night | 47°F | Partly Cloudy | 3 mph ESE | 6% |
| Thursday | 65°F | Partly Sunny | 5 mph SE | 9% |
| Thursday Night | 50°F | Mostly Cloudy | 2 mph SE | 4% |
| Friday | 68°F | Mostly Sunny | 2 to 6 mph SE | 6% |
| Friday Night | 51°F | Partly Cloudy | 5 mph SE | 12% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Clear Lake, IA
Last spring frost
May 3
First fall frost
Oct 1
Growing season
150 days
Hardiness zone
5a
Explore more for Clear Lake, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Mason City Muni Ap, Ia (3.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.