Troy, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Troy, a city in Madison County, Illinois.
This Afternoon
60°F
Mostly Cloudy
Mostly cloudy, with a high near 60. West wind around 8 mph.
7-day forecast for Troy
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 60°F | Mostly Cloudy | 8 mph W | 0% |
| Tonight | 44°F | Partly Cloudy | 6 mph SW | 0% |
| Thursday | 62°F | Mostly Sunny | 6 to 12 mph W | 8% |
| Thursday Night | 44°F | Isolated Rain Showers then Mostly Cloudy | 3 to 7 mph NW | 16% |
| Friday | 54°F | Partly Sunny | 7 to 12 mph N | 5% |
| Friday Night | 33°F | Mostly Clear | 2 to 7 mph N | 0% |
| Saturday | 53°F | Sunny | 5 mph N | 0% |
| Saturday Night | 32°F | Mostly Clear | 2 mph NW | 0% |
| Sunday | 58°F | Sunny | 1 to 5 mph W | 0% |
| Sunday Night | 35°F | Clear | 1 mph NW | 0% |
| Monday | 64°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 39°F | Clear | 2 mph SW | 1% |
| Tuesday | 65°F | Sunny | 5 mph W | 2% |
| Tuesday Night | 41°F | Mostly Clear | 1 mph NW | 3% |
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
Nearby towns & communities
Alhambra
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Bethalto
Collinsville
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Godfrey
Granite City
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Highland
Holiday Shores
Livingston
Madison
Marine
Maryville
Mitchell
Moro
New Douglas
Pontoon Beach
Prairietown
Rosewood Heights
Roxana
South Roxana
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Venice
Williamson
Wood River
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 5, 2026.