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
The start of September signals a gentle decrease in the average high-temperature, transitioning from a warm 79.7°F (26.5°C) in August to an agreeable 72.7°F (22.6°C). During September, Royal Oak experiences an average low-temperature of 56.8°F (13.8°C) at night.Humidity
In September, the average relative humidity is 74%.Rainfall
In Royal Oak, in September, it is raining for 13 days, with typically 1.81" (46mm) of accumulated precipitation. Throughout the year, there are 147.7 rainfall days, and 22.52" (572mm) of precipitation is accumulated.Snowfall
In Royal Oak, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:58 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 is 8.1h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: An average maximum UV index of 4 in September leads to these recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow in Royal Oak?
Does it snow in September?
How many hours of daylight does Royal Oak have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Royal Oak, MI
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).
Average pressure in September
Royal Oak, 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
Royal Oak, MI
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in September
Royal Oak, 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 (72%).
Average rainfall in September
Royal Oak, MI
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is May (2.72").
The driest month (with the least rainfall) is February (1.3").
Average rainfall days in September
Royal Oak, MI
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is May (17.3 days).
The months with the least rainy days are January and February (6.4 days).
Average snowfall in September
Royal Oak, 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
Royal Oak, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Royal Oak, 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 1min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Royal Oak, MI
- Average sunshine days in September: 14.9 days
The month with the most sunshine days is November (15.3 days).
The month with the least sunshine days is February (10.3 days).
Average UV index in September
Royal Oak, 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
Royal Oak, MI
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in September
Royal Oak, 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).
Royal Oak, Michigan, USA
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