Simpson, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Simpson, a village in Pope County, Illinois.
Today
88°F
Patchy Fog then Sunny
Patchy fog before 8am. Sunny. High near 88, with temperatures falling to around 86 in the afternoon. East northeast wind 0 to 3 mph.
7-day forecast for Simpson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Patchy Fog then Sunny | 0 to 3 mph ENE | 0% |
| Tonight | 64°F | Mostly Clear | 2 mph NE | 0% |
| Wednesday | 90°F | Sunny | 2 mph SSW | 0% |
| Wednesday Night | 68°F | Mostly Clear | 1 mph SSW | 0% |
| Thursday | 90°F | Slight Chance Rain Showers | 0 to 5 mph SSW | 17% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms | 2 mph S | 52% |
| Friday | 89°F | Chance Showers And Thunderstorms | 0 to 6 mph SSW | 52% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 2 mph W | 40% |
| Saturday | 89°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 32% |
| Saturday Night | 70°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph WSW | 21% |
| Sunday | 91°F | Mostly Sunny | 0 to 7 mph SSW | 9% |
| Sunday Night | 71°F | Mostly Clear | 0 to 5 mph SSW | 6% |
| Monday | 92°F | Sunny | 2 to 7 mph SSW | 5% |
| Monday Night | 73°F | Partly Cloudy | 1 to 6 mph SSW | 3% |
Forecast source: National Weather Service (api.weather.gov) for Simpson (37.467, -88.758). Updated through the day.
Growing snapshot for Simpson
Last spring frost
Apr 14
First fall frost
Oct 21
Growing season
189 days
Hardiness zone
7a
More local growing data for Simpson: nearby ZIP 62985 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Dixon Springs Agric Ctr, Il (2.2 mi from Simpson). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.