September weather forecastBelfast, PA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Belfast, Pennsylvania, with temperature in the range of an average low of 54.3°F (12.4°C) and an average high of 73.9°F (23.3°C).Temperature
September's arrival signals a moderate reduction in the average high-temperature, easing from a moderately hot 80.2°F (26.8°C) in August to a still warm 73.9°F (23.3°C). Belfast's nights in September experience an average temperature drop to a cool 54.3°F (12.4°C).Humidity
In Belfast, the average relative humidity in September is 79%.Rainfall
September is the month with the least rainfall. Rain falls for 10.6 days and accumulates 1.02" (26mm) of precipitation.Snowfall
In Belfast, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 27min.On the first day of September, sunrise is at 6:28 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm EDT.
Sunshine
The average sunshine in September in Belfast is 8.7h.UV index
In Belfast, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Belfast, PA
- Average high temperature in September: 73.9°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in September: 54.3°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in September
Belfast, PA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Belfast, PA
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in September
Belfast, PA
- Average humidity in September: 79%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Belfast, PA
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is July (2.32").
The driest month (with the least rainfall) is September (1.02").
Average rainfall days in September
Belfast, PA
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in September
Belfast, PA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.52").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Belfast, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (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
Belfast, PA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in September
Belfast, PA
- Average sunshine days in September: 17 days
The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is July (13 days).
Average UV index in September
Belfast, PA
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Belfast, PA
- Average cloud cover in September: 40
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in September
Belfast, PA
- Average visibility in September: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
