Walnut, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Walnut, a village in Bureau County, Illinois.
Overnight
65°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms. Mostly cloudy. Low around 65, with temperatures rising to around 67 overnight. Southeast wind around 10 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Walnut
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Patchy Fog | 10 mph SE | 46% |
| Saturday | 81°F | Patchy Fog | 5 to 10 mph SE | 84% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 96% |
| Sunday | 71°F | Patchy Fog | 10 to 15 mph NE | 76% |
| Sunday Night | 57°F | Chance Rain Showers | 15 mph NE | 44% |
| Monday | 65°F | Chance Rain Showers | 15 mph NE | 53% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Tuesday | 63°F | Slight Chance Rain Showers then Partly Sunny | 15 mph NE | 19% |
| Tuesday Night | 50°F | Partly Cloudy | 5 to 15 mph NE | 9% |
| Wednesday | 67°F | Mostly Sunny | 5 to 10 mph NE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 68°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 52°F | Partly Cloudy | 5 mph NE | 5% |
| Friday | 72°F | Mostly Sunny | 5 mph NE | 2% |
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
Nearby towns & communities
Arlington
Buda
Bureau Junction
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Dalzell
De Pue
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Hollowayville
La Moille
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Malden
Manlius
Mineral
Neponset
New Bedford
Ohio
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Spring Valley
Tiskilwa
Wyanet
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.