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Walnut, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Walnut, a village in Bureau County, Illinois.

Tonight
65°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1am. Mostly cloudy. Low around 65, with temperatures rising to around 67 overnight. Southeast wind 10 to 15 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.

7-day forecast for Walnut

WhenTempForecastWindPrecip
Tonight 65°F Mostly Cloudy then Chance Showers And Thunderstorms 10 to 15 mph SE 36%
Saturday 81°F Chance Showers And Thunderstorms then Showers And Thunderstorms Likely 5 to 10 mph S 67%
Saturday Night 64°F Chance Showers And Thunderstorms then Showers And Thunderstorms 5 to 10 mph N 81%
Sunday 72°F Showers And Thunderstorms Likely 10 to 15 mph NE 81%
Sunday Night 57°F Showers And Thunderstorms Likely 15 mph NE 70%
Monday 65°F Rain Showers Likely 15 mph NE 57%
Monday Night 52°F Chance Rain Showers 10 to 15 mph NE 42%
Tuesday 64°F Chance Rain Showers 15 mph NE 37%
Tuesday Night 49°F Mostly Cloudy 5 to 15 mph NE 5%
Wednesday 67°F Partly Sunny 5 to 10 mph NE 3%
Wednesday Night 51°F Partly Cloudy 5 mph NE 3%
Thursday 70°F Mostly Sunny 5 mph N 4%
Thursday Night 53°F Partly Cloudy 0 to 5 mph NE 5%
Friday 71°F Mostly Sunny 5 mph NE 5%

Forecast source: National Weather Service (api.weather.gov) for Walnut (41.557, -89.591). Updated through the day.

Growing snapshot for Walnut

Last spring frost
Apr 24
First fall frost
Oct 14
Growing season
172 days
Hardiness zone
5b

More local growing data for Walnut: nearby ZIP 61376 weather · frost dates · planting calendar · Illinois frost dates

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Climate data from the nearest NOAA station, Walnut, Il (1.5 mi from Walnut). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.