Thomson, IL Weather & Growing Conditions
This Afternoon
66°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy. High near 66, with temperatures falling to around 64 in the afternoon. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Showers And Thunderstorms | 15 mph S | 97% |
| Tonight | 52°F | Showers And Thunderstorms | 15 mph S | 85% |
| Wednesday | 56°F | Chance Rain Showers | 15 mph SW | 38% |
| Wednesday Night | 44°F | Chance Rain Showers | 10 to 15 mph SW | 26% |
| Thursday | 54°F | Chance Rain Showers | 10 mph W | 52% |
| Thursday Night | 39°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 26% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 12% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph W | 3% |
| Saturday Night | 33°F | Partly Cloudy | 0 mph | 3% |
| Sunday | 59°F | Mostly Sunny | 0 to 10 mph W | 12% |
| Sunday Night | 34°F | Mostly Clear | 0 to 5 mph W | 3% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 38°F | Mostly Clear | 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Thomson, IL
Last spring frost
Apr 13
First fall frost
Oct 26
Growing season
195 days
Hardiness zone
5b
Explore more for Thomson, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Fulton L&D #13, Il (7.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.