September weather forecastAllegan, MI
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Allegan, Michigan, with an average temperature varying between 72.5°F (22.5°C) and 54.7°F (12.6°C).Temperature
The commencement of September indicates a gentle shift in the average high-temperature, receding from August's moderately hot 78.1°F (25.6°C) to an agreeable 72.5°F (22.5°C). Throughout September, the average low-temperature records at a cool 54.7°F (12.6°C).Humidity
In Allegan, Michigan, the average relative humidity in September is 78%.Rainfall
In September, in Allegan, the rain falls for 12.3 days. Throughout September, 1.57" (40mm) of precipitation is accumulated. Throughout the year, there are 139.4 rainfall days, and 19.76" (502mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In Allegan, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 7:09 am and sunset at 8:17 pm. On the last day of September, in Allegan, sunrise is at 7:40 am and sunset at 7:26 pm EDT.
Sunshine
In Allegan, the average sunshine in September is 8.2h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 4 during September translates into the following guidance:
Exercise prevention - Protecting skin and eyes from harm is required. Around midday, solar radiation is most harmful; hence, exposure should be limited. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Allegan, MI
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (28.9°F).
- Average low temperature in September: 54.7°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).
Average pressure in September
Allegan, MI
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Allegan, MI
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in September
Allegan, MI
- Average humidity in September: 78%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (76%).
Average rainfall in September
Allegan, MI
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is October (2.4").
The driest month (with the least rainfall) is February (1.06").
Average rainfall days in September
Allegan, MI
- Average rainfall days in September: 12.3 days
The month with the highest number of rainy days is October (15.9 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in September
Allegan, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.66").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Allegan, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (17.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Allegan, MI
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 30min).
Average sunshine days in September
Allegan, MI
- Average sunshine days in September: 15.4 days
The month with the most sunshine days is September (15.4 days).
The month with the least sunshine days is January (8.7 days).
Average UV index in September
Allegan, MI
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Allegan, MI
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in September
Allegan, MI
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
