Dayton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dayton, a community in Lasalle County, Illinois.
Tonight
58°F
Rain
Rain. Cloudy. Low around 58, with temperatures rising to around 61 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Dayton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Rain | 15 mph S | 93% |
| Wednesday | 61°F | Chance Rain then Chance Rain Showers | 15 mph SSW | 39% |
| Wednesday Night | 47°F | Mostly Cloudy | 15 mph SW | 12% |
| Thursday | 58°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph WSW | 37% |
| Thursday Night | 44°F | Chance Rain Showers | 5 to 10 mph NW | 36% |
| Friday | 54°F | Slight Chance Rain Showers | 10 mph N | 22% |
| Friday Night | 36°F | Partly Cloudy | 0 to 5 mph NNW | 3% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph WNW | 3% |
| Saturday Night | 35°F | Partly Cloudy | 0 mph | 3% |
| Sunday | 58°F | Mostly Sunny | 5 to 10 mph W | 13% |
| Sunday Night | 36°F | Mostly Clear | 0 to 5 mph WNW | 5% |
| Monday | 63°F | Sunny | 5 to 10 mph WSW | 3% |
| Monday Night | 40°F | Mostly Clear | 5 mph WSW | 1% |
| Tuesday | 64°F | Sunny | 5 mph WNW | 0% |
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
Cedar Point
Dana
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
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 Nov 4, 2026.