September weather forecastBelfast, NY
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Belfast, New York, with an average temperature fluctuating between 49.8°F (9.9°C) and 69.6°F (20.9°C).Temperature
A moderate decline in average high-temperatures is noted in September, moving from a moderately hot 75.7°F (24.3°C) in August to a pleasant 69.6°F (20.9°C). Nighttime temperature lowers to an average of 49.8°F (9.9°C) in September.Humidity
In Belfast, the average relative humidity in September is 81%.Rainfall
The month with the least rainfall is September, when the rain falls for 15.5 days and typically collects 1.85" (47mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Belfast, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:38 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:55 pm EDT.
Sunshine
In Belfast, the average sunshine in September is 8.3h.UV index
In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: During September, 3 as the daily maximum UV index converts into the following advice:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Belfast, NY
- Average high temperature in September: 69.6°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (27.5°F).
- Average low temperature in September: 49.8°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).
Average pressure in September
Belfast, NY
- 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 (29.93"Hg).
Average wind speed in September
Belfast, NY
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in September
Belfast, NY
- Average humidity in September: 81%
The months with the highest relative humidity are January and February (89%).
The months with the lowest relative humidity are May, June and July (79%).
Average rainfall in September
Belfast, NY
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is April (3.07").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in September
Belfast, NY
- Average rainfall days in September: 15.5 days
The month with the highest number of rainy days is July (19.5 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in September
Belfast, NY
- Average snowfall in September: 0"
The month with the highest snowfall is February (11.1").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Belfast, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (20.4 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, NY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 30min).
Average sunshine days in September
Belfast, NY
- Average sunshine days in September: 12 days
The month with the most sunshine days is September (12 days).
The month with the least sunshine days is February (5.2 days).
Average UV index in September
Belfast, NY
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Belfast, NY
- Average cloud cover in September: 44
The month with the most cloud cover is January (Cloud cover 78).
The months with the least cloud cover are July and August (Cloud cover 40).
Average visibility in September
Belfast, NY
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February and December (4mi).
