Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
A subtle shift in Allen's weather is observed as August turns into September, with the average high temperature reducing from a warm 77.7°F (25.4°C) to an agreeable 72.3°F (22.4°C). In Allen, September's nights observe an average temperature dip to a cool 54°F (12.2°C).Humidity
The average relative humidity in September is 80%.Rainfall
In Allen, during September, the rain falls for 12.9 days and regularly aggregates up to 1.77" (45mm) of precipitation. Throughout the year, there are 154.4 rainfall days, and 28.54" (725mm) of precipitation is accumulated.Snowfall
In Allen, snow does not fall in June through September.Daylight
In Allen, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 7:05 am and sunset at 8:12 pm. On the last day of September, sunrise is at 7:35 am and sunset at 7:21 pm EDT.
Sunshine
In Allen, the average sunshine in September is 7.8h.UV index
The average daily maximum UV index in September in Allen is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: In September, the UV index of 4 transforms into the following advice:
Guard yourself - An obligation to protect skin and eyes from harm exists. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Allen have in September?
What is the UV index reading in September?
Average temperature in September
Allen, MI
- Average high temperature in September: 72.3°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 (28.6°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).
Average pressure in September
Allen, MI
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Allen, MI
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in September
Allen, MI
- Average humidity in September: 80%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in September
Allen, MI
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is April (3.78").
The driest month (with the least rainfall) is November (1.57").
Average rainfall days in September
Allen, MI
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (6.3 days).
Average snowfall in September
Allen, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.37").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Allen, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Allen, MI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 7h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in September
Allen, MI
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is November (14.8 days).
The month with the least sunshine days is May (10 days).
Average UV index in September
Allen, MI
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Allen, MI
- Average cloud cover in September: 38
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in September
Allen, MI
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Allen, Michigan, USA
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