Dayton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dayton, a community in Lasalle County, Illinois.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. South southwest wind around 5 mph, with gusts as high as 15 mph.
7-day forecast for Dayton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 5 mph SSW | 0% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph S | 18% |
| Wednesday | 81°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph W | 59% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 0 to 5 mph NW | 88% |
| Thursday | 81°F | Chance Showers And Thunderstorms | 0 to 5 mph ESE | 67% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 25% |
| Friday | 83°F | Mostly Sunny | 0 to 5 mph SSE | 6% |
| Friday Night | 66°F | Mostly Clear | 0 mph | 9% |
| Saturday | 86°F | Mostly Sunny | 0 to 5 mph SSW | 9% |
| Saturday Night | 70°F | Mostly Clear | 5 mph SSW | 14% |
| Sunday | 88°F | Mostly Sunny | 5 to 15 mph SW | 14% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 30% |
| Monday | 87°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 30% |
| Monday Night | 71°F | Chance Showers And Thunderstorms | 10 mph WSW | 38% |
Forecast source: National Weather Service (api.weather.gov) for Dayton (41.392, -88.799). Updated through the day.
Growing snapshot for Dayton
Last spring frost
Apr 27
First fall frost
Oct 17
Growing season
171 days
Hardiness zone
5b
More local growing data for Dayton: nearby ZIP 60557 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
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Earlville
Grand Ridge
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LaSalle
Leland
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Marseilles
Mendota
Millington
Naplate
Newark
North Utica
Oglesby
Ottawa
Peru
Ransom
Rutland
Seneca
Serena
Sheridan
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Tonica
Triumph
Troy Grove
Wedron
Wenona
Climate data from the nearest NOAA station, Marseilles Lock, Il (8.1 mi from Dayton). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.