Flanagan, IL Weather & Growing Conditions
Today
85°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 1pm. Cloudy, with a high near 85. Southeast wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Showers And Thunderstorms Likely | 5 mph SE | 58% |
| Tonight | 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% |
| Friday Night | 53°F | Partly Cloudy | 0 to 5 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.