Allegan, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Allegan, a city in Allegan County, Michigan.
Tonight
52°F
Showers And Thunderstorms
A chance of rain showers between 8pm and 5am, then showers and thunderstorms. Mostly cloudy. Low around 52, with temperatures rising to around 56 overnight. East wind 6 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Allegan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Showers And Thunderstorms | 6 to 9 mph E | 76% |
| Saturday | 68°F | Showers And Thunderstorms | 7 to 12 mph ESE | 97% |
| Saturday Night | 57°F | Showers And Thunderstorms | 3 to 7 mph E | 90% |
| Sunday | 68°F | Rain Showers Likely | 5 to 12 mph NE | 62% |
| Sunday Night | 48°F | Chance Rain Showers | 7 to 12 mph NE | 37% |
| Monday | 64°F | Chance Rain Showers | 12 mph ENE | 28% |
| Monday Night | 45°F | Chance Rain Showers then Mostly Cloudy | 8 to 14 mph ENE | 28% |
| Tuesday | 63°F | Partly Sunny then Slight Chance Rain Showers | 12 mph ENE | 18% |
| Tuesday Night | 46°F | Slight Chance Rain Showers | 6 to 12 mph NE | 19% |
| Wednesday | 64°F | Slight Chance Rain Showers | 9 mph NE | 19% |
| Wednesday Night | 48°F | Mostly Cloudy | 2 to 9 mph NE | 10% |
| Thursday | 67°F | Partly Sunny | 3 to 7 mph NE | 3% |
| Thursday Night | 48°F | Mostly Cloudy | 1 to 6 mph NE | 5% |
| Friday | 70°F | Mostly Sunny | 1 to 6 mph NNE | 7% |
Forecast source: National Weather Service (api.weather.gov) for Allegan (42.531, -85.839). Updated through the day.
Growing snapshot for Allegan
Last spring frost
May 4
First fall frost
Oct 15
Growing season
160 days
Hardiness zone
6a
More local growing data for Allegan: nearby ZIP 49010 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Allegan 5Ne, Mi (5.3 mi from Allegan). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.