September weather forecastBel Air, MD
September
Weather in September
September signifies the emergence of the fall season in Bel Air. The temperature starts to drop, indicating the end of the hot summer spell, yet the daylight hours are longer than that of autumn's peak. The climate's transition from summer to autumn paints colorful foliage around the town. The start of school season and the return of cool nights guide the townspeople back to their longer sleeves and jackets. Yet, September accommodates variable weather patterns, making it one of the best periods for outdoor exploration.Temperature
The start of September involves a subtle temperature drop, shifting from a warm 82.2°F (27.9°C) in August to a still moderately hot 76.1°F (24.5°C). Bel Air's temperature tends to fall to an average low of 59.2°F (15.1°C) during the nights of September.Humidity
In September, the average relative humidity is 78%.Rainfall
In September, the rain falls for 14.3 days. Throughout September, 2.48" (63mm) of precipitation is accumulated. In Bel Air, during the entire year, the rain falls for 170.1 days and collects up to 36.42" (925mm) of precipitation.Snowfall
June through October are months without snowfall.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:35 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:49 pm EDT.
Sunshine
In Bel Air, the average sunshine in September is 9h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 4 suggests this advice:
Put precautions into practice - Guidance to elude sunburn is provided. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bel Air, MD
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (37.6°F).
- Average low temperature in September: 59.2°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25.3°F).
Average pressure in September
Bel Air, MD
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Bel Air, MD
- Average wind speed in September: 6.1mph
The windiest month (with the highest average wind speed) is March (9mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in September
Bel Air, MD
- Average humidity in September: 78%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is April (74%).
Average rainfall in September
Bel Air, MD
- Average rainfall in September: 2.48"
The wettest month (with the highest rainfall) is August (4.49").
The driest month (with the least rainfall) is January (2.36").
Average rainfall days in September
Bel Air, MD
- Average rainfall days in September: 14.3 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (9.1 days).
Average snowfall in September
Bel Air, MD
- Average snowfall in September: 0"
The month with the highest snowfall is March (3.62").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Bel Air, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Bel Air, 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 24min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Bel Air, MD
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is November (18.3 days).
The month with the least sunshine days is May (8.8 days).
Average UV index in September
Bel Air, MD
- Average UV index in September: 4
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
Bel Air, MD
- Average cloud cover in September: 36
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
Bel Air, 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).
