Alpha, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alpha, a village in Henry County, Illinois.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. Southwest wind 5 to 10 mph.
7-day forecast for Alpha
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 5 to 10 mph SW | 1% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 5 mph E | 45% |
| Wednesday | 80°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph NE | 72% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 5 mph N | 84% |
| Thursday | 79°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph NE | 61% |
| Thursday Night | 62°F | Mostly Clear | 0 to 5 mph E | 14% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph S | 14% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph S | 14% |
| Saturday | 84°F | Sunny | 5 to 10 mph S | 9% |
| Saturday Night | 71°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 15% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Sunny | 10 to 15 mph SW | 15% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 10 mph S | 31% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 31% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 mph S | 33% |
Forecast source: National Weather Service (api.weather.gov) for Alpha (41.192, -90.380). Updated through the day.
Growing snapshot for Alpha
Last spring frost
Apr 28
First fall frost
Oct 12
Growing season
165 days
Hardiness zone
5b
More local growing data for Alpha: nearby ZIP 61413 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Altona, Il (11.7 mi from Alpha). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.