September weather forecastAspen Hill Park, MD
September
Weather in September
September, the first month of the autumn in Aspen Hill Park, is still a warm month, with temperature in the range of an average high of 78.3°F (25.7°C) and an average low of 61°F (16.1°C).Temperature
As September arrives, Aspen Hill Park's weather displays a minor decrease in high-temperatures, transitioning from August's warm 84.9°F (29.4°C) to a still moderately hot 78.3°F (25.7°C). Aspen Hill Park's temperature drops to an average low of 61°F (16.1°C) during the nights of September.Humidity
In September, the average relative humidity is 73%.Rainfall
In September, the rain falls for 12.9 days. Throughout September, 2.44" (62mm) of precipitation is accumulated. In Aspen Hill Park, during the entire year, the rain falls for 161.3 days and collects up to 33.19" (843mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:37 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm EDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
In Aspen Hill Park, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: A daily maximum UV index of 5 in September translates into the following instructions:
Prioritize safety - Recommendations to avert sunburn are shared. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Aspen Hill Park, MD
- Average high temperature in September: 78.3°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in September: 61°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).
Average pressure in September
Aspen Hill Park, MD
- Average pressure in September: 30.06"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
Aspen Hill Park, MD
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in September
Aspen Hill Park, MD
- Average humidity in September: 73%
The months with the highest relative humidity are May, October and December (76%).
The month with the lowest relative humidity is July (70%).
Average rainfall in September
Aspen Hill Park, MD
- Average rainfall in September: 2.44"
The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.17").
Average rainfall days in September
Aspen Hill Park, MD
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (8.8 days).
Average snowfall in September
Aspen Hill Park, MD
- Average snowfall in September: 0"
The months with the highest snowfall are January and March (3.03").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Aspen Hill Park, MD
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (5.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Aspen Hill Park, MD
- Average daylight in September: 12h and 24min
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: 8h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Aspen Hill Park, MD
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is November (19.5 days).
The months with the least sunshine days are May and July (11 days).
Average UV index in September
Aspen Hill Park, 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, November and December (UV index 2).
Average cloud cover in September
Aspen Hill Park, MD
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Aspen Hill Park, 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).
