Lewistown, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lewistown, a city in Fulton County, Illinois.
This Afternoon
83°F
Mostly Sunny
Mostly sunny, with a high near 83. East wind around 8 mph.
7-day forecast for Lewistown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 83°F | Mostly Sunny | 8 mph E | 11% |
| Tonight | 70°F | Partly Cloudy | 8 mph ESE | 12% |
| Saturday | 88°F | Slight Chance Rain Showers then Mostly Cloudy | 7 mph SSW | 15% |
| Saturday Night | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 6 mph NE | 54% |
| Sunday | 78°F | Rain Showers Likely | 2 to 10 mph N | 67% |
| Sunday Night | 59°F | Showers And Thunderstorms Likely | 7 to 12 mph NE | 67% |
| Monday | 67°F | Showers And Thunderstorms Likely | 10 mph NE | 67% |
| Monday Night | 54°F | Chance Showers And Thunderstorms | 7 to 12 mph NE | 45% |
| Tuesday | 65°F | Chance Rain Showers | 9 mph NE | 31% |
| Tuesday Night | 50°F | Mostly Cloudy | 3 to 8 mph NNE | 4% |
| Wednesday | 69°F | Mostly Sunny | 6 mph NNE | 3% |
| Wednesday Night | 53°F | Partly Cloudy | 1 to 5 mph NNE | 2% |
| Thursday | 70°F | Mostly Sunny | 5 mph NNE | 4% |
| Thursday Night | 55°F | Partly Cloudy | 3 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Lewistown (40.397, -90.156). Updated through the day.
Growing snapshot for Lewistown
Last spring frost
Apr 17
First fall frost
Oct 19
Growing season
185 days
Hardiness zone
6a
More local growing data for Lewistown: nearby ZIP 61542 weather · frost dates · planting calendar · Illinois frost dates
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Vermont
Climate data from the nearest NOAA station, Havana, Il (6.2 mi from Lewistown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.