Harman US

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

WhenTempForecastWindPrecip
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

All Michigan locations ›

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.