Farmington, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Farmington, a city in Fulton County, Illinois.

This Afternoon

79°F

Mostly Sunny

Mostly sunny. High near 79, with temperatures falling to around 74 in the afternoon. East wind around 8 mph.

7-day forecast for Farmington

When	Temp	Forecast	Wind	Precip
This Afternoon	79°F	Mostly Sunny	8 mph E	3%
Tonight	69°F	Partly Cloudy	7 to 10 mph ESE	14%
Saturday	86°F	Slight Chance Showers And Thunderstorms then Mostly Cloudy	8 mph SSE	22%
Saturday Night	67°F	Chance Showers And Thunderstorms	5 to 8 mph NNE	63%
Sunday	76°F	Rain Showers Likely	5 to 13 mph NNE	71%
Sunday Night	59°F	Showers And Thunderstorms Likely	10 to 14 mph NE	70%
Monday	66°F	Showers And Thunderstorms Likely	14 mph ENE	70%
Monday Night	54°F	Chance Rain Showers	10 to 15 mph NE	43%
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	2 to 6 mph NNE	2%
Thursday	69°F	Mostly Sunny	6 mph NNE	4%
Thursday Night	55°F	Partly Cloudy	5 mph NE	4%

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

More local growing data for Farmington: nearby ZIP 61531 weather · frost dates · planting calendar · Illinois frost dates

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Astoria Avon Bryant Canton Cuba Dunfermline Ellisville Fairview Goofy Ridge Ipava Lewistown Liverpool London Mills Marietta Norris Smithfield St. David Table Grove Vermont

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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 Sep 19, 2026.