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
With the arrival of September, Mount Clemens experiences a modest decline in average high-temperatures, transitioning from a warm 78.1°F (25.6°C) in August to a pleasant 71.4°F (21.9°C). In September, the recorded average low-temperature is a refreshing 56.8°F (13.8°C).Humidity
April, May, July through October, with an average relative humidity of 76%, are the least humid months.Rainfall
In Mount Clemens, in September, it is raining for 13.3 days, with typically 1.73" (44mm) of accumulated precipitation. Throughout the year, there are 146.8 rainfall days, and 22.72" (577mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Ocean temperature
In Mount Clemens, in September, the average water temperature is 69.4°F (20.8°C).Note: Swimming in water that is 69.4°F (20.8°C) is not enjoyable for most. Breathing becomes more challenging to manage as the water temperature dips from 69.8°F (21°C) to 59°F (15°C).
Daylight
In Mount Clemens, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:57 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 8.4h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 4 during September translates into the following directions:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the least humid month?
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?
How cold is the water in September?
What is the average length of the day in September?
What time are sunrise and sunset in September in Mount Clemens?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Mount Clemens, MI
- Average high temperature in September: 71.4°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).
Average pressure in September
Mount Clemens, MI
- Average pressure in September: 30.04"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
Mount Clemens, MI
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).
Average humidity in September
Mount Clemens, MI
- Average humidity in September: 76%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April, May, July, August, September and October (76%).
Average rainfall in September
Mount Clemens, MI
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is December (1.18").
Average rainfall days in September
Mount Clemens, MI
- Average rainfall days in September: 13.3 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in September
Mount Clemens, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.41").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Mount Clemens, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (11.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Mount Clemens, MI
- Average sea temperature in September: 69.4°F
The best month for swimming (with the highest average sea temperature) is August (73.9°F).
The coldest month (with the lowest average sea temperature) is February (32.5°F).
Average daylight in September /
Average sunshine in September
Mount Clemens, MI
- Average daylight in September: 12h and 3min
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 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
Mount Clemens, MI
- Average sunshine days in September: 14.4 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is July (10.5 days).
Average UV index in September
Mount Clemens, MI
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Mount Clemens, MI
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Mount Clemens, MI
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Mount Clemens, Michigan, USA
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