Troy, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Troy, a city in Madison County, Illinois.
Overnight
55°F
Slight Chance Drizzle
A slight chance of drizzle after 5am. Mostly cloudy, with a low around 55. Southwest wind around 8 mph.
7-day forecast for Troy
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Slight Chance Drizzle | 8 mph SW | 12% |
| Wednesday | 60°F | Slight Chance Drizzle | 8 to 14 mph W | 12% |
| Wednesday Night | 45°F | Partly Cloudy | 6 mph W | 0% |
| Thursday | 64°F | Sunny | 6 to 12 mph W | 0% |
| Thursday Night | 46°F | Mostly Cloudy | 5 mph NW | 2% |
| Friday | 57°F | Partly Sunny | 6 to 12 mph N | 1% |
| Friday Night | 36°F | Partly Cloudy | 2 to 8 mph N | 0% |
| Saturday | 55°F | Mostly Sunny | 5 mph N | 0% |
| Saturday Night | 35°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 59°F | Sunny | 2 to 7 mph NW | 1% |
| Sunday Night | 36°F | Clear | 2 mph NW | 0% |
| Monday | 65°F | Sunny | 0 to 6 mph SW | 0% |
| Monday Night | 41°F | Clear | 2 mph SW | 0% |
| Tuesday | 68°F | Sunny | 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Troy (38.740, -89.883). Updated through the day.
Growing snapshot for Troy
Last spring frost
Apr 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
7a
More local growing data for Troy: nearby ZIP 62294 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (12.7 mi from Troy). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.