Annawan, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Annawan, a town in Henry County, Illinois.
Today
87°F
Mostly Sunny
Mostly sunny, with a high near 87. Southwest wind 5 to 10 mph.
7-day forecast for Annawan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 5 to 10 mph SW | 1% |
| Tonight | 68°F | Showers And Thunderstorms Likely | 5 mph S | 57% |
| Wednesday | 79°F | Showers And Thunderstorms Likely | 5 mph W | 75% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 0 to 5 mph N | 83% |
| Thursday | 79°F | Slight Chance Showers And Thunderstorms | 5 mph NE | 55% |
| Thursday Night | 61°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 5 mph E | 18% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph S | 9% |
| Friday Night | 64°F | Mostly Clear | 0 to 5 mph S | 9% |
| Saturday | 84°F | Sunny | 5 to 10 mph SW | 9% |
| Saturday Night | 70°F | Mostly Clear | 5 to 10 mph S | 12% |
| Sunday | 86°F | Sunny | 10 to 15 mph SW | 12% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 33% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 33% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 to 15 mph SW | 36% |
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
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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 Aug 4, 2026.