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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.