Farmington, IL Weather & Growing Conditions
Overnight
68°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 68. Southeast wind around 8 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Slight Chance Showers And Thunderstorms | 8 mph SE | 23% |
| Saturday | 86°F | Patchy Fog then Mostly Cloudy | 8 mph S | 22% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 5 to 8 mph NE | 63% |
| Sunday | 76°F | Rain Showers Likely | 3 to 12 mph NNE | 70% |
| Sunday Night | 59°F | Showers And Thunderstorms Likely | 13 mph NE | 70% |
| Monday | 66°F | Showers And Thunderstorms Likely | 14 mph ENE | 70% |
| Monday Night | 54°F | Chance Rain Showers | 9 to 14 mph NE | 44% |
| Tuesday | 64°F | Chance Rain Showers | 12 mph NE | 28% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 9 mph NNE | 4% |
| Wednesday | 68°F | Partly Sunny | 8 mph NNE | 3% |
| Wednesday Night | 53°F | Partly Cloudy | 5 mph NNE | 2% |
| Thursday | 69°F | Mostly Sunny | 5 mph NNE | 4% |
| Thursday Night | 55°F | Partly Cloudy | 3 mph NE | 4% |
| Friday | 71°F | Mostly Sunny | 2 to 6 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Farmington, IL
Last spring frost
Apr 16
First fall frost
Oct 23
Growing season
189 days
Hardiness zone
5b
Explore more for Farmington, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Peoria Gtr Peoria Ap, Il (18.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.