Poplar Grove, IL Weather & Growing Conditions
Tonight
61°F
Slight Chance Rain Showers then Showers And Thunderstorms Likely
A slight chance of rain showers before midnight, then showers and thunderstorms likely between midnight and 5am, then showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy, with a low around 61. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Slight Chance Rain Showers then Showers And Thunderstorms Likely | 10 to 15 mph E | 76% |
| Saturday | 74°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 15 mph ESE | 94% |
| Saturday Night | 61°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph ENE | 75% |
| Sunday | 66°F | Showers And Thunderstorms Likely | 10 to 20 mph NE | 65% |
| Sunday Night | 54°F | Chance Rain Showers | 15 to 20 mph NE | 43% |
| Monday | 62°F | Chance Rain Showers | 15 mph ENE | 37% |
| Monday Night | 49°F | Chance Rain Showers | 10 to 15 mph NE | 37% |
| Tuesday | 61°F | Chance Rain Showers | 10 to 15 mph NE | 25% |
| Tuesday Night | 48°F | Mostly Cloudy | 5 to 10 mph NE | 11% |
| Wednesday | 64°F | Partly Sunny | 5 to 10 mph NE | 6% |
| Wednesday Night | 49°F | Partly Cloudy | 0 to 10 mph NE | 3% |
| Thursday | 66°F | Partly Sunny | 5 mph NNE | 5% |
| Thursday Night | 50°F | Mostly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 68°F | Mostly Sunny | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Poplar Grove, IL
Last spring frost
Apr 30
First fall frost
Oct 10
Growing season
161 days
Hardiness zone
5b
Explore more for Poplar Grove, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Clinton Wwtp, Wi (10.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.