Royal Lakes, IL Weather & Growing Conditions
Tonight
52°F
Rain
Rain and a slight chance of thunderstorms before 5am, then a chance of rain showers. Cloudy, with a low around 52. South wind 9 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 90%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Rain | 9 to 18 mph S | 93% |
| Wednesday | 61°F | Chance Rain Showers then Mostly Cloudy | 8 to 14 mph SW | 12% |
| Wednesday Night | 41°F | Partly Cloudy | 7 mph SW | 0% |
| Thursday | 63°F | Sunny | 6 to 12 mph W | 2% |
| Thursday Night | 40°F | Mostly Cloudy then Slight Chance T-storms | 6 mph NW | 15% |
| Friday | 57°F | Mostly Cloudy | 6 to 9 mph NW | 5% |
| Friday Night | 35°F | Partly Cloudy | 2 to 6 mph N | 2% |
| Saturday | 55°F | Mostly Sunny | 3 mph NW | 1% |
| Saturday Night | 33°F | Partly Cloudy | 2 mph NW | 1% |
| Sunday | 61°F | Sunny | 2 to 7 mph W | 7% |
| Sunday Night | 33°F | Mostly Clear | 5 mph W | 4% |
| Monday | 65°F | Sunny | 2 to 8 mph SW | 2% |
| Monday Night | 38°F | Mostly Clear | 5 mph SW | 1% |
| Tuesday | 67°F | Sunny | 6 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Royal Lakes, IL
Last spring frost
Apr 14
First fall frost
Oct 21
Growing season
188 days
Hardiness zone
6b
Explore more for Royal Lakes, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Carlinville, Il (12.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.