weather in allegan, michigan fahrenheit
Michigan Weather > Allegan Weather Allegan, MI Weather Allegan, MI climate is mild during summer when temperatures tend to be in the 60's and very cold during winter when temperatures tend to be in the 20's. The warmest month of the year is July with an average maximum temperature of 81.80 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 14.40 degrees Fahrenheit.