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 warm 77.9°F (25.5°C) in August to an agreeable 72°F (22.2°C). Portland records an average low of 52.5°F (11.4°C) throughout the nights in September.Humidity
In Portland, the average relative humidity in September is 79%.Rainfall
In Portland, in September, during 10 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. In Portland, during the entire year, the rain falls for 121.9 days and collects up to 12.01" (305mm) of precipitation.Snowfall
June through September are months without snowfall in Portland, Michigan.Daylight
In Portland, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 7:05 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 7:22 pm EDT.
Sunshine
The average sunshine in September is 8h.UV index
In September, the average daily maximum UV index in Portland is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the UV index of 3 transforms into the following advice:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Portland in September?
What is the average humidity in September in Portland?
How much does it rain in Portland in September?
When it does not snow in Portland?
Does it snow in Portland in September?
How many hours of daylight does Portland have in September?
When is the sunrise / sunset in September in Portland?
How many hours of sunshine does Portland have in September?
How high is the UV index in September in Portland?
Average temperature in September
Portland, MI
- Average high temperature in September: 72°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (27.1°F).
- Average low temperature in September: 52.5°F
The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in September
Portland, MI
- Average pressure in September: 30.03"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
Portland, MI
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is February (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in September
Portland, MI
- Average humidity in September: 79%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Portland, MI
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is May (1.77").
The driest months (with the least rainfall) are February and November (0.63").
Average rainfall days in September
Portland, MI
- Average rainfall days in September: 10 days
The month with the highest number of rainy days is May (14.5 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in September
Portland, MI
- Average snowfall in September: 0"
The month with the highest snowfall is December (2.05").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Portland, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Portland, MI
- Average daylight in September: 12h and 3min
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 0min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 42min).
Average sunshine days in September
Portland, MI
- Average sunshine days in September: 17.8 days
The month with the most sunshine days is September (17.8 days).
The month with the least sunshine days is February (13.2 days).
Average UV index in September
Portland, MI
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Portland, MI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Portland, 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).
Portland, Michigan, USA
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