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
South Lyon's September weather features a light decline in high-temperatures, reducing from a moderately hot 78.3°F (25.7°C) in August to an agreeable 71.8°F (22.1°C). South Lyon records an average low of 54.5°F (12.5°C) throughout the nights in September.Humidity
In South Lyon, the average relative humidity in September is 78%.Rainfall
In South Lyon, Michigan, in September, it is raining for 11.5 days, with typically 0.87" (22mm) of accumulated precipitation. Throughout the year, there are 121.2 rainfall days, and 11.77" (299mm) of precipitation is accumulated.Snowfall
In South Lyon, Michigan, snow does not fall in June through September.Daylight
The average length of the day in September in South Lyon, Michigan, is 12h and 28min.On the first day of September in South Lyon, sunrise is at 7:00 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
The average sunshine in September is 7.9h.UV index
The average daily maximum UV index in September in South Lyon is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in South Lyon?
What is the average humidity in September in South Lyon?
How much does it rain in South Lyon in September?
When it does not snow in South Lyon?
Does it snow in South Lyon in September?
How many hours of daylight does South Lyon have in September?
What time are sunrise and sunset in September in South Lyon?
How many hours of sunshine does South Lyon have in September?
What is the UV index reading in September in South Lyon?
Average temperature in September
South Lyon, MI
- Average high temperature in September: 71.8°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).
Average pressure in September
South Lyon, 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
South Lyon, 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 (6.5mph).
Average humidity in September
South Lyon, 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 April (76%).
Average rainfall in September
South Lyon, MI
- Average rainfall in September: 0.87"
The wettest month (with the highest rainfall) is May (1.54").
The driest month (with the least rainfall) is February (0.51").
Average rainfall days in September
South Lyon, MI
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (15.1 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in September
South Lyon, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.61").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
South Lyon, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
South Lyon, 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: 7h and 5min
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 48min).
Average sunshine days in September
South Lyon, MI
- Average sunshine days in September: 16 days
The month with the most sunshine days is October (19.3 days).
The month with the least sunshine days is May (12.8 days).
Average UV index in September
South Lyon, MI
- Average UV index in September: 3
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
South Lyon, MI
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
South Lyon, 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).
South Lyon, Michigan, USA
Weather forecast for your location
2. Allow the app to use your location