Lewistown, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Lewistown, a city in Fulton County, Illinois.

This Afternoon

70°F

Light Rain

Rain and a chance of thunderstorms. Cloudy, with a high near 70. South southeast wind around 18 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast for Lewistown

When	Temp	Forecast	Wind	Precip
This Afternoon	70°F	Light Rain	18 mph SSE	90%
Tonight	52°F	Light Rain Likely	12 to 16 mph S	73%
Wednesday	59°F	Chance Rain Showers then Mostly Cloudy	12 to 15 mph SW	10%
Wednesday Night	44°F	Mostly Cloudy	10 mph WSW	2%
Thursday	59°F	Partly Sunny	7 to 12 mph W	9%
Thursday Night	42°F	Mostly Cloudy then Slight Chance Light Rain	7 mph NW	23%
Friday	55°F	Mostly Cloudy	9 mph N	13%
Friday Night	35°F	Mostly Cloudy	1 to 7 mph N	2%
Saturday	54°F	Mostly Sunny	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	6 mph WSW	1%

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

More local growing data for Lewistown: nearby ZIP 61542 weather · frost dates · planting calendar · Illinois frost dates

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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 Nov 3, 2026.