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
A mild shift in the average high-temperature occurs in September, reducing from 83.1°F (28.4°C) in August to a still moderately hot 76.5°F (24.7°C). Throughout September, Gwynn Oak records an average temperature of 60.3°F (15.7°C) at night.Humidity
The average relative humidity in September is 76%.Rainfall
In Gwynn Oak, in September, during 13.5 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. Throughout the year, there are 160.6 rainfall days, and 31.3" (795mm) of precipitation is accumulated.Snowfall
In Gwynn Oak, Maryland, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:50 pm EDT.
Sunshine
In Gwynn Oak, the average sunshine in September is 9.1h.UV index
The average daily maximum UV index in September in Gwynn Oak is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: During September, 5 as the daily maximum UV index converts into the following advice:
Put precautions into practice - Protective measures against sun-induced damage are advised. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Gwynn Oak in September?
What is the average humidity in September in Gwynn Oak?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When are sunrise and sunset in September in Gwynn Oak?
How many hours of sunshine does Gwynn Oak have in September?
What is the UV index reading in September?
Average temperature in September
Gwynn Oak, MD
- Average high temperature in September: 76.5°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in September: 60.3°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in September
Gwynn Oak, MD
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Gwynn Oak, MD
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is March (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in September
Gwynn Oak, MD
- Average humidity in September: 76%
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is July (72%).
Average rainfall in September
Gwynn Oak, MD
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is August (3.94").
The driest months (with the least rainfall) are January and February (2.01").
Average rainfall days in September
Gwynn Oak, MD
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is February (8.8 days).
Average snowfall in September
Gwynn Oak, MD
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.72").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Gwynn Oak, MD
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (5.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Gwynn Oak, MD
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
Gwynn Oak, MD
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in September
Gwynn Oak, 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, February, November and December (UV index 2).
Average cloud cover in September
Gwynn Oak, MD
- Average cloud cover in September: 35
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Gwynn Oak, 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).
Gwynn Oak, Maryland, USA
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