Simpson, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Simpson, a village in Pope County, Illinois.
Today
99°F
Sunny
Sunny. High near 99, with temperatures falling to around 97 in the afternoon. West wind 2 to 7 mph.
7-day forecast for Simpson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 99°F | Sunny | 2 to 7 mph W | 2% |
| Tonight | 71°F | Mostly Clear | 2 mph SSW | 1% |
| Sunday | 97°F | Mostly Sunny | 1 to 6 mph SW | 0% |
| Sunday Night | 69°F | Partly Cloudy | 0 to 3 mph N | 8% |
| Monday | 88°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 7 mph NNE | 47% |
| Monday Night | 62°F | Chance Showers And Thunderstorms | 3 to 8 mph NNE | 47% |
| Tuesday | 78°F | Chance Showers And Thunderstorms | 5 to 9 mph N | 37% |
| Tuesday Night | 57°F | Partly Cloudy | 2 to 10 mph N | 12% |
| Wednesday | 77°F | Mostly Sunny | 5 to 8 mph N | 1% |
| Wednesday Night | 56°F | Partly Cloudy | 1 to 7 mph N | 1% |
| Thursday | 78°F | Mostly Sunny | 2 to 7 mph NNE | 3% |
| Thursday Night | 57°F | Partly Cloudy | 1 to 6 mph NNE | 4% |
| Friday | 79°F | Mostly Sunny | 1 to 7 mph NNE | 4% |
| Friday Night | 57°F | Partly Cloudy | 1 to 6 mph NNE | 4% |
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 Sep 19, 2026.