Somonauk, IL Weather & Growing Conditions
Overnight
63°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 63. East southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Chance Showers And Thunderstorms | 10 mph ESE | 40% |
| Saturday | 79°F | Showers And Thunderstorms Likely | 5 to 10 mph SSE | 79% |
| Saturday Night | 65°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NNE | 80% |
| Sunday | 69°F | Showers And Thunderstorms | 10 to 15 mph NE | 80% |
| Sunday Night | 56°F | Rain Showers Likely | 15 mph NE | 67% |
| Monday | 65°F | Chance Rain Showers | 15 mph ENE | 53% |
| Monday Night | 52°F | Chance Rain Showers | 15 mph NE | 32% |
| Tuesday | 64°F | Chance Rain Showers | 15 mph NE | 25% |
| Tuesday Night | 51°F | Mostly Cloudy | 10 to 15 mph NNE | 10% |
| Wednesday | 67°F | Partly Sunny | 10 to 15 mph NNE | 6% |
| Wednesday Night | 51°F | Partly Cloudy | 5 to 10 mph NNE | 4% |
| Thursday | 69°F | Partly Sunny | 5 to 10 mph NNE | 3% |
| Thursday Night | 53°F | Partly Cloudy | 5 mph NNE | 3% |
| Friday | 71°F | Mostly Sunny | 5 to 10 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Somonauk, IL
Last spring frost
Apr 28
First fall frost
Oct 13
Growing season
166 days
Hardiness zone
5b
Explore more for Somonauk, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Chicago Aurora Muni Ap, Il (13.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.