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
With the onset of September, Stephen Knolls's average high-temperature slightly adjusts, moderately receding from August's 85.6°F (29.8°C) to a still warm 78.4°F (25.8°C). September in Stephen Knolls sees the temperature falling to a mean low of 61.7°F (16.5°C).Humidity
The average relative humidity in September is 73%.Rainfall
In September, in Stephen Knolls, the rain falls for 12.4 days. Throughout September, 2.2" (56mm) of precipitation is accumulated. In Stephen Knolls, during the entire year, the rain falls for 154.8 days and collects up to 30.28" (769mm) of precipitation.Snowfall
In Stephen Knolls, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:38 pm. On the last day of September, in Stephen Knolls, sunrise is at 7:03 am and sunset at 6:51 pm EDT.
Sunshine
The average sunshine in September in Stephen Knolls, Maryland, is 8.7h.UV index
In Stephen Knolls, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: A daily maximum UV index of 5 in September translates into the following instructions:
Exercise prevention - Warding off sunburn is urged. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Frequently asked questions
What are the temperatures in Stephen Knolls in September?
What is the average humidity in September in Stephen Knolls?
How much does it rain in Stephen Knolls in September?
When it does not snow in Stephen Knolls?
What is the average length of the day in September in Stephen Knolls?
When is the sunrise / sunset in September in Stephen Knolls?
How many hours of sunshine does Stephen Knolls have in September?
How high is the UV index in September in Stephen Knolls?
Average temperature in September
Stephen Knolls, MD
- Average high temperature in September: 78.4°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.7°F).
- Average low temperature in September: 61.7°F
The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (27.1°F).
Average pressure in September
Stephen Knolls, 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
Stephen Knolls, 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 (5.2mph).
Average humidity in September
Stephen Knolls, MD
- Average humidity in September: 73%
The months with the highest relative humidity are May, October and December (75%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
Stephen Knolls, MD
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (1.89").
Average rainfall days in September
Stephen Knolls, MD
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is November (8.5 days).
Average snowfall in September
Stephen Knolls, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Stephen Knolls, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.6 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
Stephen Knolls, 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: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Stephen Knolls, MD
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (12 days).
Average UV index in September
Stephen Knolls, 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
Stephen Knolls, MD
- Average cloud cover in September: 38
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Stephen Knolls, 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).
Stephen Knolls, Maryland, USA
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