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 September, the average high-temperature marginally drops from a warm 78.4°F (25.8°C) in August to a pleasant 72.7°F (22.6°C). Decatur, in the month of September, anticipates a consistent average low-temperature of 54.5°F (12.5°C).Humidity
In September, the average relative humidity in Decatur is 79%.Rainfall
In Decatur, in September, during 12.8 rainfall days, 1.57" (40mm) of precipitation is typically accumulated. Throughout the year, in Decatur, there are 139.4 rainfall days, and 20" (508mm) of precipitation is accumulated.Snowfall
In Decatur, Michigan, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 7:10 am and sunset at 8:17 pm. On the last day of September, in Decatur, sunrise is at 7:40 am and sunset at 7:26 pm EDT.
Sunshine
The average sunshine in September in Decatur is 8.1h.UV index
The average daily maximum UV index in September in Decatur is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Frequently asked questions
What are the temperatures in Decatur in September?
What is the average humidity in September in Decatur?
How many days does it rain in September in Decatur?
When it does not snow in Decatur?
Does it snow in Decatur in September?
How many hours of daylight does Decatur have in September?
What time are sunrise and sunset in September in Decatur?
How long on average sun shines in September in Decatur?
How high is the UV index in September in Decatur?
Average temperature in September
Decatur, MI
- Average high temperature in September: 72.7°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 (28.9°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Decatur, MI
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January, March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Decatur, MI
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in September
Decatur, MI
- Average humidity in September: 79%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in September
Decatur, MI
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is June (2.6").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in September
Decatur, MI
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in September
Decatur, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Decatur, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (17.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Decatur, 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 12min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).
Average sunshine days in September
Decatur, MI
- Average sunshine days in September: 14.3 days
The month with the most sunshine days is March (14.4 days).
The month with the least sunshine days is January (9.8 days).
Average UV index in September
Decatur, MI
- Average UV index in September: 4
The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Decatur, MI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Decatur, 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).
Decatur, Michigan, USA
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