Bismarck, IL Weather & Growing Conditions
Today
83°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 83. South wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Patchy Fog then Sunny | 1 to 5 mph S | 0% |
| Tonight | 64°F | Mostly Clear | 2 mph SSE | 0% |
| Wednesday | 84°F | Mostly Sunny | 2 to 6 mph SSW | 1% |
| Wednesday Night | 66°F | Slight Chance Showers And Thunderstorms | 5 mph S | 53% |
| Thursday | 81°F | Showers And Thunderstorms | 1 to 6 mph SSW | 77% |
| Thursday Night | 65°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 1 to 5 mph S | 57% |
| Friday | 82°F | Chance Showers And Thunderstorms | 3 mph SSW | 26% |
| Friday Night | 65°F | Chance Showers And Thunderstorms | 2 mph SSW | 26% |
| Saturday | 84°F | Mostly Sunny | 1 to 6 mph SSW | 14% |
| Saturday Night | 68°F | Mostly Clear | 3 to 7 mph SSW | 12% |
| Sunday | 86°F | Mostly Sunny | 6 to 12 mph SSW | 10% |
| Sunday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 mph SSW | 15% |
| Monday | 87°F | Slight Chance Showers And Thunderstorms | 10 mph SSW | 19% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 9 mph SW | 31% |
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 Aug 4, 2026.