Allegan, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Allegan, a city in Allegan County, Michigan.
Today
69°F
Patchy Fog
Patchy fog and showers and thunderstorms before 5pm, then patchy fog and showers and thunderstorms likely. Cloudy. High near 69, with temperatures falling to around 67 in the afternoon. Southeast wind around 8 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
7-day forecast for Allegan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 69°F | Patchy Fog | 8 mph SE | 76% |
| Tonight | 59°F | Patchy Fog | 5 mph ESE | 89% |
| Sunday | 70°F | Patchy Fog | 5 to 12 mph NNE | 72% |
| Sunday Night | 48°F | Mostly Cloudy | 7 to 10 mph NE | 3% |
| Monday | 64°F | Mostly Cloudy | 12 mph ENE | 6% |
| Monday Night | 45°F | Mostly Cloudy | 7 to 12 mph ENE | 6% |
| Tuesday | 63°F | Partly Sunny | 9 to 14 mph ENE | 7% |
| Tuesday Night | 46°F | Mostly Cloudy then Slight Chance Rain Showers | 7 to 14 mph ENE | 17% |
| Wednesday | 64°F | Chance Rain Showers | 10 mph NE | 31% |
| Wednesday Night | 47°F | Slight Chance Rain Showers then Mostly Cloudy | 3 to 10 mph NE | 23% |
| Thursday | 68°F | Partly Sunny | 5 to 8 mph NE | 4% |
| Thursday Night | 47°F | Mostly Cloudy | 2 to 7 mph NE | 4% |
| Friday | 71°F | Mostly Sunny | 2 to 7 mph NE | 3% |
| Friday Night | 47°F | Partly Cloudy | 2 to 6 mph ENE | 3% |
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.