Triumph, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Triumph, a community in Lasalle County, Illinois.
This Afternoon
60°F
Slight Chance Rain Showers
A slight chance of rain showers and a slight chance of drizzle. Cloudy. High near 60, with temperatures falling to around 55 in the afternoon. West southwest wind around 15 mph, with gusts as high as 25 mph.
7-day forecast for Triumph
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 60°F | Slight Chance Rain Showers | 15 mph WSW | 9% |
| Tonight | 46°F | Slight Chance Rain Showers then Cloudy | 10 to 15 mph SW | 11% |
| Thursday | 54°F | Cloudy then Chance Rain | 10 to 15 mph W | 41% |
| Thursday Night | 39°F | Chance Rain then Mostly Cloudy | 5 to 10 mph NNW | 25% |
| Friday | 48°F | Mostly Sunny | 5 to 10 mph N | 0% |
| Friday Night | 30°F | Mostly Clear | 0 to 5 mph NNW | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 57°F | Sunny | 5 to 10 mph W | 1% |
| Sunday Night | 35°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 61°F | Sunny | 0 to 10 mph WSW | 0% |
| Monday Night | 39°F | Clear | 5 mph WSW | 0% |
| Tuesday | 62°F | Sunny | 5 mph WNW | 1% |
| Tuesday Night | 38°F | Partly Cloudy | 0 mph | 2% |
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
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Dayton
Earlville
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Kangley
LaSalle
Leland
Leonore
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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 5, 2026.