Lake Summerset, IL Weather & Growing Conditions
This Afternoon
69°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny, with a high near 69. East wind around 15 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Slight Chance Rain Showers | 15 mph E | 24% |
| Tonight | 61°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 to 15 mph ESE | 82% |
| Saturday | 75°F | Showers And Thunderstorms | 5 to 10 mph SSE | 94% |
| Saturday Night | 60°F | Showers And Thunderstorms | 5 to 10 mph NNE | 75% |
| Sunday | 66°F | Rain Showers Likely | 15 mph NE | 58% |
| Sunday Night | 53°F | Chance Rain Showers | 15 mph NE | 42% |
| Monday | 63°F | Chance Rain Showers | 15 to 20 mph ENE | 41% |
| Monday Night | 49°F | Chance Rain Showers | 10 to 15 mph NE | 41% |
| Tuesday | 61°F | Chance Rain Showers | 10 to 15 mph NE | 31% |
| Tuesday Night | 47°F | Mostly Cloudy | 5 to 15 mph NE | 9% |
| Wednesday | 64°F | Mostly Sunny | 10 mph NE | 5% |
| Wednesday Night | 49°F | Partly Cloudy | 5 to 10 mph NE | 2% |
| Thursday | 67°F | Mostly Sunny | 5 mph NNE | 5% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lake Summerset, IL
Last spring frost
Apr 29
First fall frost
Oct 12
Growing season
165 days
Hardiness zone
5a
Explore more for Lake Summerset, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Brodhead Wwtp, Wi (12.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.