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 sea temperature 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 modest decline in the average high-temperature is seen during September, decreasing from a moderately hot 78.4°F (25.8°C) in August to a pleasant 72.3°F (22.4°C). Detroit throughout September, records an average low-temperature of 58.3°F (14.6°C).Humidity
In September, the average relative humidity is 74%.Rainfall
In September, the rain falls for 13.1 days. Throughout September, 1.73" (44mm) of precipitation is accumulated. Throughout the year, there are 152.1 rainfall days, and 23.43" (595mm) of precipitation is accumulated.Snowfall
In Detroit, snow does not fall in June through September.Ocean temperature
In Detroit, the average seawater temperature in September is 70.5°F (21.4°C).Note: In water of 70.5°F (21.4°C), the majority of people do not enjoy swimming. Breathing becomes increasingly hard to manage as the temperature drops from 69.8°F (21°C) to 59°F (15°C).
Daylight
The average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:58 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:14 pm EDT.
Sunshine
In September, the average sunshine is 8.3h.UV index
In Detroit, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In September, the UV index of 4 transforms into the following advice:
Undertake protective steps - Preventing sun damage is advised. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Attention! The reflection of both water and sand can increase the intensity of UV rays.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Detroit in September?
What is the average humidity in September?
How many days does it rain in September in Detroit?
When it does not snow?
Does it snow in September?
How cold is the water in September?
How many hours of daylight does Detroit have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Detroit, MI
- Average high temperature in September: 72.3°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in September: 58.3°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in September
Detroit, 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
Detroit, MI
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).
Average humidity in September
Detroit, MI
- Average humidity in September: 74%
The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (73%).
Average rainfall in September
Detroit, MI
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is May (2.87").
The driest month (with the least rainfall) is February (1.22").
Average rainfall days in September
Detroit, MI
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7.1 days).
Average snowfall in September
Detroit, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Detroit, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Detroit, MI
- Average sea temperature in September: 70.6°F
The best month for swimming (with the highest average sea temperature) is August (75.4°F).
The coldest month (with the lowest average sea temperature) is February (32.7°F).
Average daylight in September /
Average sunshine in September
Detroit, 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 6min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Detroit, MI
- Average sunshine days in September: 15 days
The month with the most sunshine days is November (15.2 days).
The month with the least sunshine days is February (10.7 days).
Average UV index in September
Detroit, MI
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Detroit, MI
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in September
Detroit, MI
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Detroit, Michigan, USA
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