Thomson, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thomson, a village in Carroll County, Illinois.
Overnight
62°F
Mostly Clear
Mostly clear, with a low around 62. South wind around 5 mph.
7-day forecast for Thomson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 85°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Tuesday Night | 66°F | Showers And Thunderstorms Likely | 0 to 5 mph NW | 78% |
| Wednesday | 76°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 5 mph N | 72% |
| Wednesday Night | 61°F | Showers And Thunderstorms Likely | 0 to 5 mph N | 67% |
| Thursday | 79°F | Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 33% |
| Thursday Night | 61°F | Mostly Clear | 0 mph | 6% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph S | 4% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph S | 9% |
| Saturday | 85°F | Sunny | 5 to 10 mph SW | 11% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 mph S | 21% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 21% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 40% |
| Monday | 85°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 38% |
Forecast source: National Weather Service (api.weather.gov) for Thomson (41.975, -90.112). Updated through the day.
Growing snapshot for Thomson
Last spring frost
Apr 13
First fall frost
Oct 26
Growing season
195 days
Hardiness zone
5b
More local growing data for Thomson: nearby ZIP 61285 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Fulton L&D #13, Il (7.6 mi from Thomson). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.