Alpha, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alpha, a village in Henry County, Illinois.
This Afternoon
80°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy. High near 80, with temperatures falling to around 78 in the afternoon. South wind 5 to 10 mph. Chance of precipitation is 20%.
7-day forecast for Alpha
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 19% |
| Tonight | 66°F | Showers And Thunderstorms | 5 mph N | 76% |
| Sunday | 70°F | Showers And Thunderstorms Likely | 5 to 15 mph NE | 73% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 15 to 20 mph NE | 53% |
| Monday | 63°F | Rain Showers Likely | 15 mph NE | 70% |
| Monday Night | 54°F | Rain Showers Likely | 10 to 15 mph NE | 70% |
| Tuesday | 61°F | Chance Rain Showers | 15 mph NE | 54% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 15 mph NE | 8% |
| Wednesday | 64°F | Partly Sunny | 10 mph NE | 3% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NE | 2% |
| Thursday | 67°F | Partly Sunny | 5 mph NE | 3% |
| Thursday Night | 56°F | Slight Chance Rain Showers | 0 to 5 mph NE | 15% |
| Friday | 71°F | Partly Sunny | 5 mph NE | 14% |
| Friday Night | 56°F | Partly Cloudy | 0 to 5 mph NE | 7% |
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 Sep 19, 2026.