Plymouth, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Plymouth, a city in Cerro Gordo County, Iowa.
This Afternoon
68°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy. High near 68, with temperatures falling to around 63 in the afternoon. North northeast wind around 7 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Plymouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Chance Rain Showers | 7 mph NNE | 29% |
| Tonight | 57°F | Slight Chance Rain Showers | 8 to 12 mph NNE | 18% |
| Sunday | 66°F | Mostly Cloudy | 14 mph NE | 9% |
| Sunday Night | 50°F | Cloudy then Chance Rain Showers | 8 to 12 mph ENE | 34% |
| Monday | 59°F | Rain Showers Likely | 12 mph ENE | 62% |
| Monday Night | 46°F | Rain Showers Likely | 5 to 8 mph NE | 62% |
| Tuesday | 60°F | Partly Sunny | 5 to 8 mph ENE | 10% |
| Tuesday Night | 43°F | Partly Cloudy | 5 mph E | 1% |
| Wednesday | 64°F | Mostly Sunny | 2 to 6 mph E | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 3 mph SE | 10% |
| Thursday | 66°F | Slight Chance Rain Showers | 2 to 6 mph SE | 20% |
| Thursday Night | 52°F | Slight Chance Rain Showers | 3 mph SE | 18% |
| Friday | 70°F | Partly Sunny | 1 to 5 mph ESE | 14% |
| Friday Night | 54°F | Mostly Cloudy | 3 mph SE | 9% |
Forecast source: National Weather Service (api.weather.gov) for Plymouth (43.246, -93.123). Updated through the day.
Growing snapshot for Plymouth
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
More local growing data for Plymouth: nearby ZIP 50464 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mason City, Ia (8.5 mi from Plymouth). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.