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
In Posen, entering September brings a subtle temperature decrement, reducing from August's pleasant 71.8°F (22.1°C) to an enjoyable 65.3°F (18.5°C). Posen's temperature lowers to a mean of 54.5°F (12.5°C) during the nights in September.Humidity
In September, the average relative humidity is 78%.Rainfall
In Posen, in September, during 12 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. Throughout the year, in Posen, there are 133.1 rainfall days, and 22.44" (570mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Posen.Daylight
The average length of the day in September in Posen is 12h and 31min.On the first day of the month, sunrise is at 6:57 am and sunset at 8:11 pm. On the last day of September, in Posen, Michigan, sunrise is at 7:32 am and sunset at 7:16 pm EDT.
Sunshine
In September, the average sunshine is 8.1h.UV index
In Posen, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The UV index of 3 during September leads to these advisories:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Posen?
What is the average humidity in September in Posen?
How much does it rain in Posen in September?
When it does not snow in Posen?
Does it snow in Posen in September?
What is the average length of the day in September in Posen?
When are sunrise and sunset in September in Posen?
How long on average sun shines in September in Posen?
What is the UV index reading in September in Posen?
Average temperature in September
Posen, MI
- Average high temperature in September: 65.3°F
The warmest month (with the highest average high temperature) is August (71.8°F).
The month with the lowest average high temperature is January (25°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is August (60.4°F).
The coldest month (with the lowest average low temperature) is February (17.8°F).
Average pressure in September
Posen, 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
Posen, MI
- Average wind speed in September: 9.3mph
The windiest months (with the highest average wind speed) are January and December (12.1mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).
Average humidity in September
Posen, MI
- Average humidity in September: 78%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is May (76%).
Average rainfall in September
Posen, MI
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is October (2.76").
The driest month (with the least rainfall) is February (1.22").
Average rainfall days in September
Posen, MI
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is October (17.4 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in September
Posen, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.75").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Posen, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (20.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Posen, MI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- 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: 1h and 42min).
Average sunshine days in September
Posen, MI
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is May (15.9 days).
The month with the least sunshine days is January (6.4 days).
Average UV index in September
Posen, 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
Posen, MI
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 83).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Posen, MI
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
Posen, Michigan, USA
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