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
With September's onset, the weather reveals a slight temperature decrease, transitioning from a moderately hot 76.6°F (24.8°C) in August to an agreeable 69.4°F (20.8°C). During September, the nighttime temperature averages to a fresh 50.4°F (10.2°C).Humidity
In September, the average relative humidity in Roscommon is 79%.Rainfall
The month with the least rainfall is September, when the rain falls for 11.3 days and typically collects 1.1" (28mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 7:01 am and sunset at 8:14 pm. On the last day of September, in Roscommon, sunrise is at 7:35 am and sunset at 7:20 pm EDT.
Sunshine
In Roscommon, the average sunshine in September is 8h.UV index
The average daily maximum UV index in September in Roscommon is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: A daily maximum UV index of 3 in September translates into the following instructions:
Act with care - The need to guard against sun damage is communicated. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Roscommon?
What is the average humidity in September in Roscommon?
What is the driest month in Roscommon?
How many days does it rain in September in Roscommon?
When it does not snow in Roscommon?
Does it snow in Roscommon in September?
How many hours of daylight does Roscommon have in September?
What time are sunrise and sunset in September in Roscommon?
How long on average sun shines in September in Roscommon?
What is the UV index reading in September in Roscommon?
Average temperature in September
Roscommon, MI
- Average high temperature in September: 69.4°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (24.1°F).
- Average low temperature in September: 50.4°F
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).
Average pressure in September
Roscommon, MI
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Roscommon, MI
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is April (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in September
Roscommon, MI
- Average humidity in September: 79%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is May (72%).
Average rainfall in September
Roscommon, MI
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is October (2.64").
The driest month (with the least rainfall) is September (1.1").
Average rainfall days in September
Roscommon, MI
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is October (16.2 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in September
Roscommon, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (8.07").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Roscommon, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (21.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Roscommon, MI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 1h and 54min).
Average sunshine days in September
Roscommon, MI
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is September (16.3 days).
The month with the least sunshine days is January (7.8 days).
Average UV index in September
Roscommon, MI
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Roscommon, MI
- Average cloud cover in September: 38
The month with the most cloud cover is January (Cloud cover 80).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in September
Roscommon, MI
- Average visibility in September: 5mi
The months with the highest visibility are April, May, June and July (6mi).
The months with the lowest visibility are January and February (4mi).
Roscommon, Michigan, USA
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