Royal Lakes, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Royal Lakes, a village in Macoupin County, Illinois.
Tonight
54°F
Rain
Rain before 4am, then a slight chance of drizzle. Mostly cloudy, with a low around 54. Southwest wind 9 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 90%.
7-day forecast for Royal Lakes
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Rain | 9 to 21 mph SW | 91% |
| Wednesday | 61°F | Slight Chance Drizzle then Mostly Cloudy | 9 to 14 mph W | 12% |
| Wednesday Night | 42°F | Partly Cloudy | 7 mph SW | 1% |
| Thursday | 62°F | Sunny | 7 to 12 mph W | 2% |
| Thursday Night | 41°F | Mostly Cloudy | 6 mph NW | 14% |
| Friday | 57°F | Partly Sunny | 6 to 10 mph NW | 5% |
| Friday Night | 36°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 | 34°F | Mostly Clear | 5 mph W | 4% |
| Monday | 65°F | Sunny | 3 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) for Royal Lakes (39.113, -89.959). Updated through the day.
Growing snapshot for Royal Lakes
Last spring frost
Apr 14
First fall frost
Oct 21
Growing season
188 days
Hardiness zone
6b
More local growing data for Royal Lakes: nearby ZIP 62685 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Carlinville, Il (12.1 mi from Royal Lakes). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.