Bismarck, IL Weather & Growing Conditions
Today
65°F
Slight Chance Light Rain then Slight Chance Drizzle
A slight chance of rain before 9am, then a slight chance of drizzle. Mostly cloudy. High near 65, with temperatures falling to around 59 in the afternoon. Southwest wind 12 to 15 mph, with gusts as high as 24 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 | 65°F | Slight Chance Light Rain then Slight Chance Drizzle | 12 to 15 mph SW | 16% |
| Tonight | 46°F | Slight Chance Drizzle then Mostly Cloudy | 12 mph SW | 10% |
| Thursday | 61°F | Partly Sunny then Slight Chance Light Rain | 10 to 15 mph WSW | 16% |
| Thursday Night | 44°F | Chance Light Rain | 6 mph WNW | 25% |
| Friday | 54°F | Slight Chance Light Rain then Mostly Cloudy | 7 to 10 mph NNW | 17% |
| Friday Night | 35°F | Partly Cloudy | 3 to 8 mph NW | 0% |
| Saturday | 53°F | Sunny | 6 mph NW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 2 mph WNW | 1% |
| Sunday | 59°F | Sunny | 1 to 7 mph W | 2% |
| Sunday Night | 33°F | Mostly Clear | 3 mph W | 0% |
| Monday | 63°F | Sunny | 1 to 6 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 3 mph SW | 1% |
| Tuesday | 66°F | Sunny | 5 mph W | 1% |
| Tuesday Night | 38°F | Mostly Clear | 2 mph NNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Bismarck, IL
Last spring frost
Apr 21
First fall frost
Oct 20
Growing season
181 days
Hardiness zone
6a
Explore more for Bismarck, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Danville, Il (7.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.