September weather forecastMarlow Heights, MD
September
Weather in September
The first month of the autumn, September, is still a warm month in Marlow Heights, Maryland, with an average temperature fluctuating between 78.4°F (25.8°C) and 61.9°F (16.6°C).Temperature
Marlow Heights in September undergoes a slight reduction in the average high-temperature, shifting from August's 85.8°F (29.9°C) to a still moderately hot 78.4°F (25.8°C). Marlow Heights experiences an average low-temperature of 61.9°F (16.6°C) in the month of September.Humidity
In September, the average relative humidity is 74%.Rainfall
In Marlow Heights, in September, it is raining for 12.5 days, with typically 1.85" (47mm) of accumulated precipitation. In Marlow Heights, during the entire year, the rain falls for 149.1 days and collects up to 26.14" (664mm) of precipitation.Snowfall
In Marlow Heights, snow does not fall in April through November.Daylight
In Marlow Heights, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:37 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm EDT.
Sunshine
In September, the average sunshine in Marlow Heights is 9h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In September, an average UV index of 5 transforms into the following instructions:
Put precautions into practice - Guidance to elude sunburn is provided. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Marlow Heights, MD
- Average high temperature in September: 78.4°F
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.6°F).
- Average low temperature in September: 61.9°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (27.5°F).
Average pressure in September
Marlow Heights, 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 (29.95"Hg).
Average wind speed in September
Marlow Heights, MD
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Marlow Heights, MD
- Average humidity in September: 74%
The month with the highest relative humidity is May (76%).
The months with the lowest relative humidity are April and July (71%).
Average rainfall in September
Marlow Heights, MD
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is August (3.46").
The driest month (with the least rainfall) is January (1.57").
Average rainfall days in September
Marlow Heights, MD
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is November (8.1 days).
Average snowfall in September
Marlow Heights, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.17").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Marlow Heights, MD
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (3.8 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
Marlow Heights, MD
- Average daylight in September: 12h and 24min
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 30min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).
Average sunshine days in September
Marlow Heights, MD
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (12.8 days).
Average UV index in September
Marlow Heights, MD
- Average UV index in September: 5
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Marlow Heights, MD
- Average cloud cover in September: 36
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
Marlow Heights, MD
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
