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
Swanton experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a warm 77.7°F (25.4°C) in August to a pleasant 72.1°F (22.3°C). Throughout the nights in September, Swanton experiences an average low-temperature of 52.3°F (11.3°C).Humidity
The average relative humidity in September is 80%.Rainfall
In Swanton, in September, during 16.6 rainfall days, 2.48" (63mm) of precipitation is typically accumulated. Throughout the year, there are 185.7 rainfall days, and 35.39" (899mm) of precipitation is accumulated.Snowfall
In Swanton, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:45 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:00 pm EDT.
Sunshine
In September, the average sunshine is 8.3h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 4 in September translates into these instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Swanton have in September?
What is the UV index intensity in September?
Average temperature in September
Swanton, MD
- Average high temperature in September: 72.1°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in September: 52.3°F
The month with the highest average low temperature is July (58.5°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in September
Swanton, 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 (29.96"Hg).
Average wind speed in September
Swanton, MD
- Average wind speed in September: 5.2mph
The windiest months (with the highest average wind speed) are January and February (8.9mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Swanton, MD
- Average humidity in September: 80%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is July (78%).
Average rainfall in September
Swanton, MD
- Average rainfall in September: 2.48"
The wettest month (with the highest rainfall) is May (3.9").
The driest month (with the least rainfall) is November (2.24").
Average rainfall days in September
Swanton, MD
- Average rainfall days in September: 16.6 days
The month with the highest number of rainy days is May (22.3 days).
The month with the least rainy days is February (9.3 days).
Average snowfall in September
Swanton, MD
- Average snowfall in September: 0"
The month with the highest snowfall is February (7.6").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Swanton, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Swanton, 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 24min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Swanton, MD
- Average sunshine days in September: 11 days
The month with the most sunshine days is November (14.5 days).
The month with the least sunshine days is May (6.9 days).
Average UV index in September
Swanton, MD
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Swanton, MD
- Average cloud cover in September: 44
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 40).
Average visibility in September
Swanton, MD
- Average visibility in September: 4mi
The months with the highest visibility are March, April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are January, February and September (4mi).
Swanton, Maryland, USA
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