Triumph, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Triumph, a community in Lasalle County, Illinois.
Tonight
57°F
Rain
Rain. Cloudy. Low around 57, with temperatures rising to around 60 overnight. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Triumph
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Rain | 15 mph S | 90% |
| Wednesday | 60°F | Chance Rain then Mostly Cloudy | 15 mph SSW | 38% |
| Wednesday Night | 47°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph SW | 16% |
| Thursday | 56°F | Chance Rain Showers | 10 to 15 mph WSW | 46% |
| Thursday Night | 43°F | Chance Rain Showers | 5 to 10 mph NW | 37% |
| Friday | 52°F | Slight Chance Rain Showers then Partly Sunny | 10 mph N | 18% |
| Friday Night | 35°F | Partly Cloudy | 0 to 5 mph NNW | 2% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 3% |
| Saturday Night | 35°F | Partly Cloudy | 0 to 5 mph WSW | 4% |
| Sunday | 57°F | Mostly Sunny | 5 to 10 mph W | 13% |
| Sunday Night | 35°F | Mostly Clear | 5 mph WNW | 5% |
| Monday | 62°F | Sunny | 5 to 10 mph WSW | 3% |
| Monday Night | 40°F | Mostly Clear | 5 mph W | 1% |
| Tuesday | 62°F | Sunny | 5 mph WNW | 0% |
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 Nov 4, 2026.