Plymouth, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Plymouth, a city in Cerro Gordo County, Iowa.
Overnight
46°F
Chance Rain Showers
A chance of rain showers. Cloudy. Low around 46, with temperatures rising to around 48 overnight. West wind around 9 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Plymouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Chance Rain Showers | 9 mph W | 52% |
| Wednesday | 50°F | Rain Showers Likely | 12 to 15 mph W | 55% |
| Wednesday Night | 43°F | Rain Showers Likely | 9 to 13 mph WNW | 68% |
| Thursday | 50°F | Chance Rain Showers then Cloudy | 12 to 15 mph NNW | 35% |
| Thursday Night | 33°F | Mostly Cloudy | 5 to 10 mph N | 5% |
| Friday | 46°F | Mostly Sunny | 6 mph NNE | 1% |
| Friday Night | 26°F | Partly Cloudy | 2 mph N | 0% |
| Saturday | 49°F | Mostly Sunny | 1 to 5 mph SW | 0% |
| Saturday Night | 33°F | Mostly Clear | 5 mph W | 2% |
| Sunday | 55°F | Sunny | 7 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 | 58°F | Mostly Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.