Riley, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Riley, a community in Mchenry County, Illinois.
Tonight
58°F
Rain Showers
Rain showers. Cloudy. Low around 58, with temperatures rising to around 61 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Riley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Rain Showers | 15 mph S | 88% |
| Wednesday | 61°F | Rain Showers Likely | 15 mph SSW | 55% |
| Wednesday Night | 47°F | Chance Rain Showers | 15 mph SW | 31% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph WSW | 46% |
| Thursday Night | 41°F | Chance Rain Showers | 5 to 10 mph NW | 46% |
| Friday | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph N | 20% |
| Friday Night | 34°F | Partly Cloudy | 0 to 5 mph NNW | 3% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 3% |
| Saturday Night | 33°F | Partly Cloudy | 0 to 5 mph WSW | 5% |
| Sunday | 57°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 16% |
| Sunday Night | 35°F | Mostly Clear | 0 to 5 mph W | 5% |
| Monday | 60°F | Sunny | 5 to 15 mph WSW | 2% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph W | 1% |
| Tuesday | 61°F | Sunny | 5 to 10 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Riley (42.193, -88.629). Updated through the day.
Growing snapshot for Riley
Last spring frost
Apr 28
First fall frost
Oct 12
Growing season
166 days
Hardiness zone
5b
More local growing data for Riley: nearby ZIP 60152 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Marengo, Il (2 mi from Riley). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.