Flanagan, IL Weather & Growing Conditions
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. South southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
| Tonight | 66°F | Partly Cloudy | 5 mph S | 1% |
| Wednesday | 83°F | Chance Showers And Thunderstorms | 5 mph SSW | 44% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph NW | 90% |
| Thursday | 82°F | Showers And Thunderstorms | 0 to 5 mph SSW | 83% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 31% |
| Friday | 84°F | Mostly Sunny | 0 to 5 mph S | 10% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms | 0 mph | 21% |
| Saturday | 86°F | Mostly Sunny | 0 to 5 mph SSW | 11% |
| Saturday Night | 70°F | Mostly Clear | 5 to 10 mph SSW | 11% |
| Sunday | 89°F | Sunny | 10 to 15 mph SSW | 11% |
| Sunday Night | 72°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 mph SSW | 23% |
| Monday | 89°F | Slight Chance Showers And Thunderstorms | 10 mph SSW | 23% |
| Monday Night | 71°F | Chance Showers And Thunderstorms | 10 mph SW | 31% |
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 Aug 4, 2026.