Troy, IL Weather & Growing Conditions
Tonight
73°F
Partly Cloudy
Partly cloudy, with a low around 73. Southwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 73°F | Partly Cloudy | 5 mph SW | 2% |
| Sunday | 93°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 7 mph W | 19% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 9 mph N | 64% |
| Monday | 81°F | Showers And Thunderstorms Likely | 6 to 10 mph NE | 64% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 44% |
| Tuesday | 72°F | Slight Chance Rain Showers then Mostly Cloudy | 8 to 13 mph N | 17% |
| Tuesday Night | 55°F | Mostly Cloudy | 5 to 13 mph N | 1% |
| Wednesday | 74°F | Mostly Sunny | 7 to 10 mph N | 0% |
| Wednesday Night | 55°F | Partly Cloudy | 2 to 9 mph N | 0% |
| Thursday | 76°F | Mostly Sunny | 3 to 8 mph N | 0% |
| Thursday Night | 58°F | Mostly Cloudy then Slight Chance Rain Showers | 2 to 7 mph NE | 15% |
| Friday | 79°F | Slight Chance Rain Showers | 2 to 8 mph NE | 17% |
| Friday Night | 58°F | Slight Chance Rain Showers then Partly Cloudy | 2 to 7 mph NE | 17% |
| Saturday | 82°F | Mostly Sunny | 2 to 6 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Troy, IL
Last spring frost
Apr 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
7a
Explore more for Troy, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (12.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.