Simpson, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Simpson, a village in Pope County, Illinois.
This Afternoon
79°F
Partly Sunny
Partly sunny. High near 79, with temperatures falling to around 76 in the afternoon. South wind around 17 mph, with gusts as high as 28 mph.
7-day forecast for Simpson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Partly Sunny | 17 mph S | 5% |
| Tonight | 56°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms | 6 to 13 mph S | 98% |
| Wednesday | 70°F | Partly Sunny | 5 to 9 mph SW | 8% |
| Wednesday Night | 43°F | Mostly Clear | 2 mph SW | 0% |
| Thursday | 70°F | Sunny | 0 to 7 mph SW | 0% |
| Thursday Night | 44°F | Partly Cloudy | 1 mph NW | 4% |
| Friday | 63°F | Partly Sunny | 1 to 8 mph NNW | 4% |
| Friday Night | 39°F | Mostly Cloudy | 1 to 5 mph NNW | 1% |
| Saturday | 59°F | Mostly Sunny | 1 to 5 mph NNW | 0% |
| Saturday Night | 34°F | Partly Cloudy | 0 mph | 1% |
| Sunday | 63°F | Sunny | 0 to 6 mph WNW | 5% |
| Sunday Night | 34°F | Mostly Clear | 2 mph NW | 6% |
| Monday | 65°F | Sunny | 1 to 7 mph WNW | 2% |
| Monday Night | 37°F | Mostly Clear | 2 mph NW | 0% |
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 Nov 3, 2026.