Annawan, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Annawan, a town in Henry County, Illinois.
Tonight
66°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1am. Mostly cloudy. Low around 66, with temperatures rising to around 68 overnight. Southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
7-day forecast for Annawan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 66°F | Mostly Cloudy then Chance Showers And Thunderstorms | 10 mph SE | 43% |
| Saturday | 83°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 mph S | 60% |
| Saturday Night | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph NW | 82% |
| Sunday | 73°F | Showers And Thunderstorms | 5 to 15 mph NE | 82% |
| Sunday Night | 56°F | Showers And Thunderstorms Likely | 15 mph NE | 62% |
| Monday | 66°F | Showers And Thunderstorms Likely | 15 mph NE | 60% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 45% |
| Tuesday | 64°F | Chance Rain Showers | 15 mph NE | 43% |
| Tuesday Night | 49°F | Mostly Cloudy | 5 to 15 mph NE | 4% |
| Wednesday | 68°F | Mostly Sunny | 5 to 10 mph NE | 3% |
| Wednesday Night | 51°F | Partly Cloudy | 0 to 10 mph NE | 3% |
| Thursday | 70°F | Mostly Sunny | 0 to 5 mph N | 4% |
| Thursday Night | 53°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 72°F | Mostly Sunny | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Annawan (41.396, -89.891). Updated through the day.
Growing snapshot for Annawan
Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
175 days
Hardiness zone
5b
More local growing data for Annawan: nearby ZIP 61234 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
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Cambridge
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Kewanee
Lynn Center
Ophiem
Orion
Osco
Swedona
Woodhull
Climate data from the nearest NOAA station, Kewanee 1 E, Il (12.1 mi from Annawan). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.