Plymouth, IL Weather & Growing Conditions
This Afternoon
86°F
Mostly Cloudy
Mostly cloudy, with a high near 86. Southwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 86°F | Mostly Cloudy | 7 mph SW | 6% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 5 mph W | 61% |
| Sunday | 77°F | Showers And Thunderstorms Likely | 2 to 12 mph N | 67% |
| Sunday Night | 59°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 8 to 13 mph NE | 71% |
| Monday | 66°F | Showers And Thunderstorms Likely | 9 to 13 mph ENE | 73% |
| Monday Night | 55°F | Rain Showers Likely | 8 to 12 mph NE | 73% |
| Tuesday | 64°F | Chance Rain Showers | 12 mph NE | 31% |
| Tuesday Night | 50°F | Mostly Cloudy | 3 to 9 mph NNE | 3% |
| Wednesday | 66°F | Partly Sunny | 5 to 8 mph NNE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 6 mph NNE | 1% |
| Thursday | 70°F | Partly Sunny | 1 to 5 mph NE | 2% |
| Thursday Night | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph NE | 15% |
| Friday | 74°F | Slight Chance Rain Showers then Partly Sunny | 1 to 6 mph NE | 15% |
| Friday Night | 57°F | Partly Cloudy | 5 mph ENE | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Plymouth, IL
Last spring frost
Apr 13
First fall frost
Oct 22
Growing season
191 days
Hardiness zone
6a
Explore more for Plymouth, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Bentley, Il (13.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.