Farmington, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Farmington, a city in Fulton County, Illinois.
This Afternoon
68°F
Light Rain
Rain and a slight chance of thunderstorms. Mostly cloudy, with a high near 68. South southeast wind around 18 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Farmington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Light Rain | 18 mph SSE | 82% |
| Tonight | 53°F | Light Rain | 13 to 18 mph S | 77% |
| Wednesday | 58°F | Slight Chance Light Rain then Mostly Cloudy | 13 to 16 mph SW | 15% |
| Wednesday Night | 46°F | Mostly Cloudy | 13 mph SW | 6% |
| Thursday | 57°F | Partly Sunny then Slight Chance Light Rain | 8 to 13 mph WSW | 15% |
| Thursday Night | 43°F | Chance Light Rain | 5 to 8 mph NW | 29% |
| Friday | 54°F | Slight Chance Light Rain then Mostly Cloudy | 8 to 12 mph N | 16% |
| Friday Night | 36°F | Mostly Cloudy | 1 to 7 mph NNW | 2% |
| Saturday | 53°F | Mostly Sunny | 1 to 5 mph WNW | 3% |
| Saturday Night | 35°F | Partly Cloudy | 3 mph W | 3% |
| Sunday | 59°F | Sunny | 3 to 8 mph WNW | 12% |
| Sunday Night | 36°F | Mostly Clear | 5 mph W | 4% |
| Monday | 63°F | Sunny | 3 to 10 mph SW | 2% |
| Monday Night | 41°F | Mostly Clear | 7 mph WSW | 1% |
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 Nov 4, 2026.