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
September's arrival signals a moderate reduction in the average high-temperature, easing from a moderately hot 77.9°F (25.5°C) in August to an agreeable 72°F (22.2°C). An average minimum temperature of 57.9°F (14.4°C) is recorded during the month of September.Humidity
The average relative humidity in September in Flat Rock, Michigan, is 77%.Rainfall
In September, in Flat Rock, the rain falls for 13.6 days. Throughout September, 1.81" (46mm) of precipitation is accumulated. Throughout the year, there are 151.8 rainfall days, and 25.47" (647mm) of precipitation is accumulated.Snowfall
In Flat Rock, snow does not fall in June through October.Daylight
The average length of the day in September in Flat Rock, Michigan, is 12h and 28min.On the first day of September in Flat Rock, sunrise is at 6:59 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 7:15 pm EDT.
Sunshine
The average sunshine in September in Flat Rock is 8.3h.UV index
The average daily maximum UV index in September in Flat Rock, Michigan, is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Frequently asked questions
What are September temperatures in Flat Rock?
What is the average humidity in September in Flat Rock?
How much does it rain in Flat Rock in September?
When it does not snow in Flat Rock?
What is the average length of the day in September in Flat Rock?
When are sunrise and sunset in September in Flat Rock?
How many hours of sunshine does Flat Rock have in September?
How high is the UV index in September in Flat Rock?
Average temperature in September
Flat Rock, MI
- Average high temperature in September: 72°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (29.5°F).
- Average low temperature in September: 57.9°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).
Average pressure in September
Flat Rock, 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
Flat Rock, MI
- Average wind speed in September: 7.9mph
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
Flat Rock, MI
- Average humidity in September: 77%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Flat Rock, MI
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is December (1.26").
Average rainfall days in September
Flat Rock, MI
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (6.1 days).
Average snowfall in September
Flat Rock, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.25").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Flat Rock, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Flat Rock, 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: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in September
Flat Rock, MI
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is July (10.3 days).
Average UV index in September
Flat Rock, 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
Flat Rock, MI
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Flat Rock, 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).
Flat Rock, Michigan, USA
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