Plymouth, IA Weather & Growing Conditions
This Afternoon
68°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1pm, then patchy fog and a slight chance of showers and thunderstorms between 1pm and 2pm, then a chance of showers and thunderstorms. Cloudy. High near 68, with temperatures falling to around 66 in the afternoon. North northeast wind around 8 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Chance Showers And Thunderstorms | 8 mph NNE | 40% |
| Tonight | 57°F | Slight Chance Rain Showers | 9 to 13 mph NNE | 18% |
| Sunday | 66°F | Mostly Cloudy | 15 mph NE | 8% |
| Sunday Night | 50°F | Mostly Cloudy then Slight Chance Rain Showers | 13 mph ENE | 23% |
| Monday | 61°F | Chance Rain Showers | 13 mph ENE | 34% |
| Monday Night | 45°F | Chance Rain Showers then Mostly Cloudy | 6 to 9 mph ENE | 26% |
| Tuesday | 61°F | Mostly Sunny | 8 mph ENE | 11% |
| Tuesday Night | 42°F | Mostly Clear | 2 to 6 mph E | 1% |
| Wednesday | 64°F | Sunny | 6 mph E | 1% |
| Wednesday Night | 47°F | Partly Cloudy | 3 mph ESE | 5% |
| Thursday | 66°F | Partly Sunny | 5 mph SE | 10% |
| Thursday Night | 50°F | Partly Cloudy | 3 mph ESE | 4% |
| Friday | 68°F | Mostly Sunny | 1 to 6 mph SE | 4% |
| Friday Night | 51°F | Partly Cloudy | 5 mph SE | 11% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Plymouth, IA
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
Explore more for Plymouth, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Mason City, Ia (8.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.