Flanagan, IL Weather & Growing Conditions
Today
63°F
Patchy Drizzle
Patchy drizzle and isolated rain showers. Mostly cloudy. High near 63, with temperatures falling to around 56 in the afternoon. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 63°F | Patchy Drizzle | 15 mph SW | 18% |
| Tonight | 47°F | Patchy Drizzle then Mostly Cloudy | 10 to 15 mph SW | 10% |
| Thursday | 59°F | Mostly Cloudy then Slight Chance Rain Showers | 15 mph WSW | 22% |
| Thursday Night | 41°F | Chance Rain Showers | 5 to 10 mph NW | 40% |
| Friday | 52°F | Partly Sunny | 10 to 15 mph NNW | 10% |
| Friday Night | 32°F | Partly Cloudy | 0 to 10 mph NNW | 0% |
| Saturday | 54°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 0 to 5 mph WNW | 1% |
| Sunday | 58°F | Sunny | 0 to 10 mph W | 2% |
| Sunday Night | 33°F | Clear | 0 to 5 mph W | 0% |
| Monday | 64°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 mph WSW | 1% |
| Tuesday | 65°F | Sunny | 5 mph WNW | 1% |
| Tuesday Night | 38°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
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 Nov 4, 2026.