Clear Lake, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Clear Lake, a city in Cerro Gordo County, Iowa.
Tonight
63°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 11pm, then patchy fog and showers and thunderstorms likely between 11pm and 1am, then patchy fog and showers and thunderstorms likely between 1am and 5am, then patchy fog and a chance of showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy. Low around 63, with temperatures rising to around 66 overnight. Southeast wind 8 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Clear Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 63°F | Showers And Thunderstorms Likely | 8 to 13 mph SE | 72% |
| Saturday | 72°F | Patchy Fog | 8 mph N | 44% |
| Saturday Night | 56°F | Chance Showers And Thunderstorms | 8 to 13 mph NNE | 27% |
| Sunday | 64°F | Slight Chance Rain Showers | 14 mph NE | 17% |
| Sunday Night | 51°F | Chance Rain Showers | 12 mph ENE | 25% |
| Monday | 60°F | Chance Rain Showers | 13 mph ENE | 50% |
| Monday Night | 46°F | Chance Rain Showers | 7 to 10 mph ENE | 47% |
| Tuesday | 60°F | Slight Chance Rain Showers then Partly Sunny | 8 mph ENE | 15% |
| Tuesday Night | 44°F | Partly Cloudy | 2 to 6 mph E | 1% |
| Wednesday | 63°F | Sunny | 5 mph ESE | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 2 mph SE | 6% |
| Thursday | 66°F | Slight Chance Rain Showers | 3 mph SSE | 16% |
| Thursday Night | 51°F | Partly Cloudy | 2 mph SSE | 7% |
| Friday | 67°F | Mostly Sunny | 5 mph SE | 8% |
Forecast source: National Weather Service (api.weather.gov) for Clear Lake (43.135, -93.374). Updated through the day.
Growing snapshot for Clear Lake
Last spring frost
May 3
First fall frost
Oct 1
Growing season
150 days
Hardiness zone
5a
More local growing data for Clear Lake: nearby ZIP 50428 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mason City Muni Ap, Ia (3.4 mi from Clear Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.