September weather forecastBethlehem, MD
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Bethlehem, Maryland, with an average temperature fluctuating between 77.4°F (25.2°C) and 63.5°F (17.5°C).Temperature
September's arrival signals a moderate reduction in the average high-temperature, easing from a warm 82.9°F (28.3°C) in August to a still moderately hot 77.4°F (25.2°C). Bethlehem reports a consistent average low-temperature of 63.5°F (17.5°C) throughout September nights.Humidity
In September, the average relative humidity is 77%.Rainfall
In September, the rain falls for 11.3 days. Throughout September, 0.79" (20mm) of precipitation is accumulated. Throughout the year, there are 130 rainfall days, and 15.04" (382mm) of precipitation is accumulated.Snowfall
In Bethlehem, snow does not fall in May through October.Daylight
In Bethlehem, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:33 pm. On the last day of September, sunrise is at 6:59 am and sunset at 6:47 pm EDT.
Sunshine
In Bethlehem, the average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 5 suggests these recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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
Average temperature in September
Bethlehem, MD
- Average high temperature in September: 77.4°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 (40.6°F).
- Average low temperature in September: 63.5°F
The month with the highest average low temperature is July (70.9°F).
The coldest month (with the lowest average low temperature) is January (29.7°F).
Average pressure in September
Bethlehem, 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
Bethlehem, MD
- Average wind speed in September: 7.1mph
The windiest months (with the highest average wind speed) are February and March (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Bethlehem, MD
- Average humidity in September: 77%
The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are January and November (73%).
Average rainfall in September
Bethlehem, MD
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is August (1.93").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days in September
Bethlehem, MD
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is February (7.4 days).
Average snowfall in September
Bethlehem, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.59").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Bethlehem, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3 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
Bethlehem, 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 24min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in September
Bethlehem, MD
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is November (21 days).
The month with the least sunshine days is August (13 days).
Average UV index in September
Bethlehem, 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, February and December (UV index 2).
Average cloud cover in September
Bethlehem, MD
- Average cloud cover in September: 33
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Bethlehem, MD
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
