Dayton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dayton, a community in Lasalle County, Illinois.
This Afternoon
81°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 4pm, then a slight chance of showers and thunderstorms. Cloudy, with a high near 81. Southeast wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Dayton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 81°F | Chance Showers And Thunderstorms | 5 mph SE | 36% |
| Tonight | 66°F | Showers And Thunderstorms | 5 mph S | 92% |
| Sunday | 73°F | Showers And Thunderstorms Likely | 5 to 15 mph NNE | 66% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms | 15 mph NE | 45% |
| Monday | 66°F | Rain Showers Likely | 15 mph ENE | 55% |
| Monday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 38% |
| Tuesday | 65°F | Slight Chance Rain Showers | 15 mph NE | 18% |
| Tuesday Night | 52°F | Mostly Cloudy | 5 to 15 mph NNE | 11% |
| Wednesday | 68°F | Mostly Sunny | 10 mph NNE | 6% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 10 mph NNE | 1% |
| Thursday | 70°F | Partly Sunny | 5 to 10 mph NNE | 3% |
| Thursday Night | 54°F | Partly Cloudy | 5 mph NE | 3% |
| Friday | 74°F | Mostly Sunny | 5 to 10 mph NE | 3% |
| Friday Night | 54°F | Partly Cloudy | 5 mph NE | 2% |
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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Grand Ridge
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Millington
Naplate
Newark
North Utica
Oglesby
Ottawa
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Rutland
Seneca
Serena
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Tonica
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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 Sep 19, 2026.