Farmington, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Farmington, a city in Fulton County, Illinois.
Overnight
62°F
Mostly Clear
Mostly clear, with a low around 62. South southeast wind around 3 mph.
7-day forecast for Farmington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Mostly Clear | 3 mph SSE | 0% |
| Tuesday | 87°F | Mostly Sunny | 3 to 7 mph S | 0% |
| Tuesday Night | 67°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSE | 21% |
| Wednesday | 83°F | Chance Showers And Thunderstorms | 5 mph SSW | 51% |
| Wednesday Night | 65°F | Showers And Thunderstorms | 6 mph N | 86% |
| Thursday | 81°F | Showers And Thunderstorms | 3 mph S | 77% |
| Thursday Night | 64°F | Partly Cloudy | 2 mph ESE | 11% |
| Friday | 83°F | Mostly Sunny | 2 mph S | 10% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms | 1 mph S | 15% |
| Saturday | 86°F | Sunny | 5 mph SSW | 13% |
| Saturday Night | 70°F | Mostly Clear | 2 to 7 mph S | 9% |
| Sunday | 88°F | Sunny | 7 to 12 mph SSW | 7% |
| Sunday Night | 71°F | Mostly Clear then Chance Showers And Thunderstorms | 6 to 9 mph SSW | 25% |
| Monday | 88°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 9 mph SSW | 25% |
Forecast source: National Weather Service (api.weather.gov) for Farmington (40.697, -90.002). Updated through the day.
Growing snapshot for Farmington
Last spring frost
Apr 16
First fall frost
Oct 23
Growing season
189 days
Hardiness zone
5b
More local growing data for Farmington: nearby ZIP 61531 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Peoria Gtr Peoria Ap, Il (18.5 mi from Farmington). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.