Trenton, IL Weather & Growing Conditions
Today
86°F
Sunny
Sunny, with a high near 86. Southeast wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 2 mph SE | 0% |
| Tonight | 66°F | Mostly Clear | 2 mph SE | 0% |
| Wednesday | 89°F | Sunny | 0 to 5 mph S | 5% |
| Wednesday Night | 71°F | Mostly Cloudy then Showers And Thunderstorms Likely | 6 mph S | 60% |
| Thursday | 86°F | Showers And Thunderstorms Likely | 6 mph SW | 73% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 0 to 3 mph SE | 47% |
| Friday | 86°F | Chance Showers And Thunderstorms | 2 mph SW | 47% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 2 mph S | 36% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 3 mph S | 36% |
| Saturday Night | 72°F | Partly Cloudy | 5 mph S | 10% |
| Sunday | 90°F | Sunny | 3 to 8 mph S | 7% |
| Sunday Night | 73°F | Mostly Clear | 6 to 9 mph S | 4% |
| Monday | 92°F | Sunny | 5 to 8 mph S | 4% |
| Monday Night | 74°F | Slight Chance Showers And Thunderstorms | 8 mph S | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Trenton, IL
Last spring frost
Apr 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
6b
Explore more for Trenton, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (10.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.