Mason City, IA Weather & Growing Conditions
This Afternoon
63°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy. High near 63, with temperatures falling to around 60 in the afternoon. North northwest wind around 8 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 63°F | Showers And Thunderstorms Likely | 8 mph NNW | 65% |
| Tonight | 45°F | Rain Showers | 8 mph WNW | 88% |
| Wednesday | 51°F | Rain Showers | 9 to 14 mph W | 83% |
| Wednesday Night | 40°F | Rain Showers | 10 mph W | 82% |
| Thursday | 49°F | Rain Showers Likely | 12 mph NNW | 63% |
| Thursday Night | 34°F | Mostly Cloudy | 5 to 8 mph N | 13% |
| Friday | 48°F | Partly Sunny | 2 to 7 mph NNE | 1% |
| Friday Night | 29°F | Partly Cloudy | 1 mph NNE | 1% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph WSW | 2% |
| Saturday Night | 33°F | Partly Cloudy | 5 mph W | 4% |
| Sunday | 58°F | Sunny | 7 mph W | 7% |
| Sunday Night | 35°F | Mostly Clear | 5 mph SW | 1% |
| Monday | 61°F | Mostly Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 37°F | Mostly Clear | 6 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mason City, IA
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
Explore more for Mason City, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Mason City, Ia (0.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.