Mason City, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mason City, a city in Cerro Gordo County, Iowa.
Today
50°F
Chance Rain Showers
A chance of rain showers. Cloudy. High near 50, with temperatures falling to around 48 in the afternoon. West wind around 14 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 for Mason City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 50°F | Chance Rain Showers | 14 mph W | 49% |
| Tonight | 42°F | Rain Showers Likely | 12 mph WNW | 65% |
| Thursday | 50°F | Chance Rain Showers then Cloudy | 9 to 14 mph NNW | 41% |
| Thursday Night | 33°F | Mostly Cloudy | 3 to 8 mph N | 7% |
| Friday | 46°F | Mostly Sunny | 2 to 6 mph NNE | 1% |
| Friday Night | 26°F | Partly Cloudy | 1 mph NNW | 0% |
| Saturday | 50°F | Mostly Sunny | 0 to 5 mph SW | 0% |
| Saturday Night | 33°F | Mostly Clear | 5 mph W | 2% |
| Sunday | 55°F | Sunny | 6 mph W | 2% |
| Sunday Night | 34°F | Mostly Clear | 5 mph SW | 0% |
| Monday | 61°F | Sunny | 5 to 9 mph SW | 0% |
| Monday Night | 37°F | Mostly Clear | 5 mph WNW | 0% |
| Tuesday | 59°F | Mostly Sunny | 3 mph NW | 0% |
| Tuesday Night | 38°F | Partly Cloudy | 2 mph SSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Mason City (43.149, -93.200). Updated through the day.
Growing snapshot for Mason City
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
More local growing data for Mason City: nearby ZIP 50401 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mason City, Ia (0.7 mi from Mason City). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.