Flanagan, IL Weather & Growing Conditions
This Afternoon
79°F
Partly Sunny
Partly sunny, with a high near 79. East wind around 10 mph, with gusts as high as 20 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Partly Sunny | 10 mph E | 12% |
| Tonight | 67°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph ESE | 17% |
| Saturday | 86°F | Chance Showers And Thunderstorms | 5 to 10 mph SSE | 44% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 5 mph WNW | 69% |
| Sunday | 75°F | Showers And Thunderstorms Likely | 5 to 15 mph NE | 71% |
| Sunday Night | 57°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 70% |
| Monday | 68°F | Showers And Thunderstorms Likely | 15 mph ENE | 68% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 44% |
| Tuesday | 67°F | Chance Rain Showers | 10 to 15 mph NE | 27% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 10 mph NNE | 7% |
| Wednesday | 70°F | Partly Sunny | 5 to 10 mph NNE | 5% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 10 mph NNE | 5% |
| Thursday | 71°F | Mostly Sunny | 0 to 10 mph N | 2% |
| Thursday Night | 54°F | Partly Cloudy | 0 to 5 mph NNE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Flanagan, IL
Last spring frost
Apr 16
First fall frost
Oct 24
Growing season
191 days
Hardiness zone
5b
Explore more for Flanagan, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Pontiac, Il (7.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.