Annawan, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Annawan, a town in Henry County, Illinois.
This Afternoon
69°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy, with a high near 69. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%.
7-day forecast for Annawan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Showers And Thunderstorms | 15 mph S | 90% |
| Tonight | 53°F | Showers And Thunderstorms | 15 mph S | 82% |
| Wednesday | 58°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph SW | 23% |
| Wednesday Night | 45°F | Mostly Cloudy | 10 to 15 mph SW | 14% |
| Thursday | 56°F | Chance Rain Showers | 10 to 15 mph W | 42% |
| Thursday Night | 43°F | Chance Rain Showers | 5 to 10 mph NW | 31% |
| Friday | 53°F | Slight Chance Rain Showers then Partly Sunny | 10 mph N | 15% |
| Friday Night | 35°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph W | 3% |
| Saturday Night | 35°F | Partly Cloudy | 0 to 5 mph W | 5% |
| Sunday | 59°F | Sunny | 5 to 10 mph W | 11% |
| Sunday Night | 35°F | Mostly Clear | 5 mph W | 2% |
| Monday | 64°F | Sunny | 5 to 15 mph SW | 2% |
| Monday Night | 40°F | Mostly Clear | 5 to 10 mph W | 0% |
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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Andover
Atkinson
Bishop Hill
Cambridge
Cleveland
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Galva
Geneseo
Hooppole
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 Nov 4, 2026.