September weather forecastRochester Hills, MI
September
Weather in September
The transitional season of fall initiates in September in Rochester Hills, Michigan. Temperatures follow a downward trajectory from their August peak, contributing to the steady caramelization of the lush summer foliage. The allure of fall makes it a favored season for tourists, resulting in increased city activity. The decrease in temperature and rainfall aids in the gradual transition towards the upcoming chill of winter. Sunsets occurring earlier each evening initiate the inevitable reduction in daylight hours experienced in the fall months.Temperature
September witnesses a gentle descent in average high-temperature, descending from August's moderately hot 78.4°F (25.8°C) to an agreeable 71.8°F (22.1°C). Rochester Hills anticipates an average minimum temperature of 55.4°F (13°C) in the month of September.Humidity
The average relative humidity in September is 76%.Rainfall
In Rochester Hills, in September, during 12.1 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. In Rochester Hills, during the entire year, the rain falls for 146.2 days and collects up to 18.5" (470mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 6:58 am and sunset at 8:06 pm. On the last day of September, sunrise is at 7:29 am and sunset at 7:15 pm EDT.
Sunshine
The average sunshine in September in Rochester Hills is 8.2h.UV index
In Rochester Hills, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rochester Hills, MI
- Average high temperature in September: 71.8°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in September: 55.4°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure in September
Rochester Hills, MI
- Average pressure in September: 30.03"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
Rochester Hills, MI
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in September
Rochester Hills, MI
- Average humidity in September: 76%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are April, May, July and August (75%).
Average rainfall in September
Rochester Hills, MI
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is May (2.28").
The driest months (with the least rainfall) are February and December (1.02").
Average rainfall days in September
Rochester Hills, MI
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (6.4 days).
Average snowfall in September
Rochester Hills, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Rochester Hills, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Rochester Hills, MI
- Average daylight in September: 12h and 30min
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 12min
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 6min).
Average sunshine days in September
Rochester Hills, MI
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is November (14.9 days).
The month with the least sunshine days is February (9.8 days).
Average UV index in September
Rochester Hills, 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
Rochester Hills, MI
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in September
Rochester Hills, 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).
