Troy, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Troy, a city in Madison County, Illinois.
Today
87°F
Sunny
Sunny, with a high near 87. South wind around 3 mph.
7-day forecast for Troy
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 3 mph S | 0% |
| Tonight | 67°F | Mostly Clear | 5 mph SE | 0% |
| Wednesday | 90°F | Sunny | 2 to 6 mph S | 9% |
| Wednesday Night | 71°F | Slight Chance Showers And Thunderstorms | 3 to 7 mph S | 68% |
| Thursday | 86°F | Showers And Thunderstorms Likely | 6 mph S | 73% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 1 to 5 mph SE | 42% |
| Friday | 86°F | Chance Showers And Thunderstorms | 5 mph SW | 42% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 3 mph S | 34% |
| Saturday | 88°F | Chance Showers And Thunderstorms then Mostly Sunny | 1 to 5 mph S | 34% |
| Saturday Night | 72°F | Mostly Clear | 6 mph S | 9% |
| Sunday | 91°F | Sunny | 5 to 9 mph S | 7% |
| Sunday Night | 74°F | Mostly Clear | 8 mph S | 5% |
| Monday | 93°F | Mostly Sunny | 6 to 9 mph S | 5% |
| Monday Night | 75°F | Slight Chance Showers And Thunderstorms | 8 mph S | 15% |
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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Hamel
Hartford
Highland
Holiday Shores
Livingston
Madison
Marine
Maryville
Mitchell
Moro
New Douglas
Pontoon Beach
Prairietown
Rosewood Heights
Roxana
South Roxana
St. Jacob
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 Aug 4, 2026.