September weather forecastBuffalo, NY
September
Weather in September
September in Buffalo experiences the onset of fall with milder days and cooler nights. Weather continues to transition towards lower values with temperatures diminishing from the summer highs. Autumn’s arrival is marked by noticeably less daylight hours and the complete lack of snow from May to September. Though it remains frequently sunny, clouds start to make a more regular appearance. The wind speed also displays a move upwards symbolizing the changing periodic influence.Temperature
September is characterized by a slight reduction in average high-temperature, easing from a moderately hot 78.4°F (25.8°C) in August to an agreeable 72°F (22.2°C). Throughout September, Buffalo registers a consistent average low-temperature of 56.7°F (13.7°C).Humidity
July through September, with an average relative humidity of 74%, are the least humid months.Rainfall
September is the month with the least rainfall. Rain falls for 15 days and accumulates 1.81" (46mm) of precipitation.Snowfall
June through September are months without snowfall.Ocean temperature
In Buffalo, in September, the average water temperature is 69.4°F (20.8°C).Note: Swimming in 69.4°F (20.8°C) is not a pleasurable activity for the majority of people. Breathing becomes increasingly challenging as water temperature descends from 69.8°F (21°C) to 59°F (15°C).
Daylight
In September, the average length of the day is 12h and 29min.On the first day of September, sunrise is at 6:40 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:58 pm EDT.
Sunshine
In Buffalo, the average sunshine in September is 8.8h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 4 during September translates into these guidelines:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Avoiding the Sun during its peak radiation time around midday is a healthy practice. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Buffalo, NY
- Average high temperature in September: 72°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in September: 56.7°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).
Average pressure in September
Buffalo, NY
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Buffalo, NY
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is January (11mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).
Average humidity in September
Buffalo, NY
- Average humidity in September: 74%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are July, August and September (74%).
Average rainfall in September
Buffalo, NY
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is May (2.87").
The driest month (with the least rainfall) is September (1.81").
Average rainfall days in September
Buffalo, NY
- Average rainfall days in September: 15 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (7.6 days).
Average snowfall in September
Buffalo, NY
- Average snowfall in September: 0"
The month with the highest snowfall is February (7.64").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Buffalo, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (19 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Buffalo, NY
- Average sea temperature in September: 69.4°F
The best month for swimming (with the highest average sea temperature) is August (74.2°F).
The coldest month (with the lowest average sea temperature) is February (34.9°F).
Average daylight in September /
Average sunshine in September
Buffalo, NY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in September
Buffalo, NY
- Average sunshine days in September: 12.5 days
The month with the most sunshine days is September (12.5 days).
The month with the least sunshine days is January (6.3 days).
Average UV index in September
Buffalo, NY
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in September
Buffalo, NY
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Buffalo, NY
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
