Thomson, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thomson, a village in Carroll County, Illinois.
Today
68°F
Occasional Showers And Thunderstorms
Occasional showers and thunderstorms. Cloudy. High near 68, with temperatures falling to around 65 in the afternoon. South wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Thomson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Occasional Showers And Thunderstorms | 15 to 20 mph S | 97% |
| Tonight | 52°F | Showers And Thunderstorms | 15 mph S | 93% |
| Wednesday | 57°F | Chance Rain Showers | 10 to 15 mph SW | 26% |
| Wednesday Night | 45°F | Slight Chance Rain Showers | 10 to 15 mph SW | 21% |
| Thursday | 57°F | Chance Rain Showers | 5 to 10 mph W | 35% |
| Thursday Night | 42°F | Slight Chance Rain Showers | 5 mph NW | 19% |
| Friday | 54°F | Partly Sunny | 5 to 10 mph N | 9% |
| Friday Night | 37°F | Partly Cloudy | 0 to 5 mph N | 2% |
| Saturday | 53°F | Partly Sunny | 0 to 5 mph NW | 1% |
| Saturday Night | 36°F | Partly Cloudy | 0 mph | 5% |
| Sunday | 54°F | Mostly Sunny | 0 to 10 mph W | 12% |
| Sunday Night | 35°F | Partly Cloudy | 0 to 5 mph W | 5% |
| Monday | 57°F | Sunny | 0 to 10 mph SW | 2% |
| Monday Night | 38°F | Mostly Clear | 0 to 5 mph SW | 1% |
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 Nov 3, 2026.