Triumph, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Triumph, a community in Lasalle County, Illinois.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph.
7-day forecast for Triumph
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
| Tonight | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SSW | 25% |
| Wednesday | 79°F | Chance Showers And Thunderstorms | 5 mph W | 61% |
| Wednesday Night | 65°F | Showers And Thunderstorms | 5 mph N | 86% |
| Thursday | 79°F | Chance Showers And Thunderstorms | 0 to 5 mph E | 61% |
| Thursday Night | 63°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 20% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SE | 6% |
| Friday Night | 64°F | Mostly Clear | 0 to 5 mph S | 9% |
| Saturday | 84°F | Mostly Sunny | 5 to 10 mph SSW | 10% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 15% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 15% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 32% |
| Monday | 86°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 32% |
| Monday Night | 70°F | Chance Showers And Thunderstorms | 10 mph WSW | 38% |
Forecast source: National Weather Service (api.weather.gov) for Triumph (41.499, -89.020). Updated through the day.
Growing snapshot for Triumph
Last spring frost
Apr 24
First fall frost
Oct 18
Growing season
176 days
More local growing data for Triumph: nearby ZIP 61371 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Cedar Point
Dana
Dayton
Earlville
Grand Ridge
Harding
Kangley
LaSalle
Leland
Leonore
Lostant
Marseilles
Mendota
Millington
Naplate
Newark
North Utica
Oglesby
Ottawa
Peru
Ransom
Rutland
Seneca
Serena
Sheridan
Streator
Tonica
Troy Grove
Wedron
Wenona
Climate data from the nearest NOAA station, Peru, Il (11.2 mi from Triumph). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.