Harman US

Flanagan, IL Weather & Growing Conditions

Overnight
67°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. Low around 67, with temperatures rising to around 69 overnight. Southeast wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Overnight 67°F Chance Showers And Thunderstorms 5 mph SE 25%
Saturday 85°F Showers And Thunderstorms Likely 5 mph SE 58%
Saturday Night 67°F Showers And Thunderstorms Likely 0 to 5 mph SSW 73%
Sunday 75°F Showers And Thunderstorms Likely 5 to 15 mph N 73%
Sunday Night 57°F Chance Showers And Thunderstorms 10 to 15 mph NE 52%
Monday 67°F Rain Showers Likely 15 mph ENE 61%
Monday Night 52°F Chance Rain Showers 10 to 15 mph NE 45%
Tuesday 66°F Chance Rain Showers 10 to 15 mph NE 28%
Tuesday Night 51°F Slight Chance Rain Showers then Mostly Cloudy 5 to 15 mph NNE 15%
Wednesday 69°F Mostly Sunny 5 to 10 mph NNE 6%
Wednesday Night 52°F Partly Cloudy 5 to 10 mph NNE 2%
Thursday 71°F Partly Sunny 5 to 10 mph NNE 2%
Thursday Night 53°F Partly Cloudy 0 to 5 mph NNE 2%
Friday 74°F Mostly Sunny 5 to 10 mph NE 3%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Flanagan, IL

Last spring frost
Apr 26
First fall frost
Oct 17
Growing season
173 days
Hardiness zone
5b

Explore more for Flanagan, IL: full frost dates · planting calendar · Illinois frost dates

Climate data from the nearest NOAA station, Minonk, Il (9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.