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
Ann Arbor records a mild change in average high-temperature during September, easing from a warm 78.3°F (25.7°C) in August to a pleasant 72.5°F (22.5°C). Throughout September, Ann Arbor registers a consistent average low-temperature of 54.9°F (12.7°C).Humidity
In Ann Arbor, the average relative humidity in September is 79%.Rainfall
In September, the rain falls for 13.4 days. Throughout September, 1.46" (37mm) of precipitation is accumulated. Throughout the year, there are 144.9 rainfall days, and 18.82" (478mm) of precipitation is accumulated.Snowfall
In Ann Arbor, snow does not fall in June through September.Daylight
In September, the average length of the day in Ann Arbor is 12h and 28min.On the first day of September, sunrise is at 7:01 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:17 pm EDT.
Sunshine
In Ann Arbor, the average sunshine in September is 8.1h.UV index
In Ann Arbor, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: In September, a regular UV index of 4 translates into these guidelines:
Undertake protective steps - Recommendations to avoid sunburn are issued. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow in Ann Arbor?
Does it snow in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Ann Arbor have in September?
How high is the UV index in September in Ann Arbor?
Average temperature in September
Ann Arbor, MI
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in September: 54.9°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure in September
Ann Arbor, 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
Ann Arbor, MI
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in September
Ann Arbor, MI
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Ann Arbor, MI
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is May (2.4").
The driest month (with the least rainfall) is December (0.87").
Average rainfall days in September
Ann Arbor, MI
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is January (5.2 days).
Average snowfall in September
Ann Arbor, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Ann Arbor, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Ann Arbor, 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 30min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Ann Arbor, MI
- Average sunshine days in September: 14.6 days
The month with the most sunshine days is October (17.5 days).
The month with the least sunshine days is July (10.3 days).
Average UV index in September
Ann Arbor, MI
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Ann Arbor, 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
Ann Arbor, MI
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Ann Arbor, Michigan, USA
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