Lewistown, IL Weather & Growing Conditions
Tonight
52°F
Light Rain Likely
Rain likely before 4am. Mostly cloudy, with a low around 52. South southwest wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Light Rain Likely | 9 to 13 mph SSW | 56% |
| Wednesday | 59°F | Mostly Cloudy | 12 to 15 mph SW | 11% |
| Wednesday Night | 44°F | Mostly Cloudy | 10 mph WSW | 1% |
| Thursday | 59°F | Partly Sunny | 8 to 13 mph W | 8% |
| Thursday Night | 41°F | Mostly Cloudy then Slight Chance Light Rain | 7 mph NW | 22% |
| Friday | 55°F | Mostly Cloudy | 9 mph N | 13% |
| Friday Night | 35°F | Mostly Cloudy | 0 to 7 mph N | 2% |
| Saturday | 54°F | Mostly Sunny | 0 to 3 mph WNW | 3% |
| Saturday Night | 34°F | Partly Cloudy | 2 mph W | 2% |
| Sunday | 61°F | Sunny | 2 to 7 mph WNW | 9% |
| Sunday Night | 35°F | Mostly Clear | 5 mph W | 4% |
| Monday | 65°F | Sunny | 2 to 9 mph SW | 1% |
| Monday Night | 39°F | Mostly Clear | 2 to 6 mph WSW | 1% |
| Tuesday | 67°F | Sunny | 2 to 6 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lewistown, IL
Last spring frost
Apr 17
First fall frost
Oct 19
Growing season
185 days
Hardiness zone
6a
Explore more for Lewistown, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Havana, Il (6.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.