Williamsfield, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsfield, a village in Knox County, Illinois.
Tonight
68°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely after 10pm. Mostly cloudy, with a low around 68. East wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Williamsfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 68°F | Showers And Thunderstorms Likely | 5 mph E | 61% |
| Sunday | 73°F | Showers And Thunderstorms Likely | 3 to 13 mph NNE | 64% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 10 to 14 mph ENE | 50% |
| Monday | 65°F | Rain Showers Likely | 12 to 15 mph ENE | 70% |
| Monday Night | 54°F | Rain Showers Likely | 10 to 14 mph NE | 65% |
| Tuesday | 63°F | Chance Rain Showers | 13 mph NE | 52% |
| Tuesday Night | 51°F | Mostly Cloudy | 6 to 13 mph NNE | 10% |
| Wednesday | 66°F | Partly Sunny | 7 to 10 mph NNE | 3% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 8 mph NNE | 1% |
| Thursday | 69°F | Mostly Sunny | 6 mph NNE | 2% |
| Thursday Night | 55°F | Slight Chance Rain Showers | 1 to 5 mph NE | 15% |
| Friday | 73°F | Partly Sunny | 2 to 6 mph NE | 11% |
| Friday Night | 55°F | Partly Cloudy | 3 mph NE | 6% |
| Saturday | 74°F | Mostly Sunny | 1 to 5 mph ENE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Williamsfield (40.926, -90.018). Updated through the day.
Growing snapshot for Williamsfield
Last spring frost
Apr 21
First fall frost
Oct 20
Growing season
181 days
Hardiness zone
5b
More local growing data for Williamsfield: nearby ZIP 61489 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Abingdon
Altona
East Galesburg
Galesburg
Gilson
Henderson
Knoxville
Maquon
Nekoma
Oak Run
Oneida
Rio
St. Augustine
Victoria
Wataga
Yates City
Climate data from the nearest NOAA station, Knoxville, Il (13.5 mi from Williamsfield). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.