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
The arrival of September corresponds with a light shift in temperature, down from a warm 82.8°F (28.2°C) in August to a still moderately hot 77°F (25°C). Allen temperatures generally rest at a low of 65.8°F (18.8°C) during the September nights.Humidity
In September, the average relative humidity in Allen is 78%.Rainfall
In Allen, in September, during 13.8 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. Throughout the year, there are 158.2 rainfall days, and 29.96" (761mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September in Allen is 12h and 25min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:46 pm EDT.
Sunshine
In September, the average sunshine in Allen is 9.5h.UV index
In September, the average daily maximum UV index in Allen, Maryland, is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: In September, the UV index of 5 transforms into the following advice:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Frequently asked questions
What is the average September temperature in Allen?
What is the average humidity in September in Allen?
How much does it rain in Allen in September?
When it does not snow in Allen?
What is the average length of the day in September in Allen?
When is the sunrise / sunset in September in Allen?
How long on average sun shines in September in Allen?
What is the UV index reading in September in Allen?
Average temperature in September
Allen, MD
- Average high temperature in September: 77°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (42.1°F).
- Average low temperature in September: 65.8°F
The month with the highest average low temperature is July (72.3°F).
The coldest month (with the lowest average low temperature) is January (31.5°F).
Average pressure in September
Allen, MD
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Allen, MD
- Average wind speed in September: 8.2mph
The windiest months (with the highest average wind speed) are January, February and March (10.4mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in September
Allen, MD
- Average humidity in September: 78%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is January (74%).
Average rainfall in September
Allen, MD
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is August (3.46").
The driest month (with the least rainfall) is January (1.93").
Average rainfall days in September
Allen, MD
- Average rainfall days in September: 13.8 days
The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is January (9.7 days).
Average snowfall in September
Allen, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.34").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Allen, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Allen, MD
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are February and December (Average sunshine: 5h and 18min).
Average sunshine days in September
Allen, MD
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is August (9.8 days).
Average UV index in September
Allen, MD
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Allen, MD
- Average cloud cover in September: 31
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
Allen, MD
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Allen, Maryland, USA
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