Weather in September
Temperature
September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's moderately hot 78.8°F (26°C) to a pleasant 71.6°F (22°C). Throughout September, Greater Rochester International Airport records an average temperature of 51.8°F (11°C) at night.Rainfall
In Greater Rochester International Airport, during September, the rain falls for 11 days and regularly aggregates up to 2.95" (75mm) of precipitation. In Greater Rochester International Airport, during the entire year, the rain falls for 152 days and collects up to 31.89" (810mm) of precipitation.Ocean temperature
In Greater Rochester International Airport, the average seawater temperature in September is 66.2°F (19°C).Note: Swimming in water with a temperature of 66.2°F (19°C) is not a pleasurable experience for the majority. As the temperature falls below 69.8°F (21°C), it becomes increasingly hard to control one's breathing.
Daylight
The average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:45 pm. On the last day of September, sunrise is at 7:07 am and sunset at 6:53 pm EDT.
Sunshine
In September, the average sunshine is 7h.UV index
The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The daily high UV index of 6 in September translates into this advice:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
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Average temperature in September
Greater Rochester International Airport, NY
- Average high temperature in September: 72°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30°F).
- Average low temperature in September: 52°F
The months with the highest average low temperature are July and August (59°F).
The coldest months (with the lowest average low temperature) are January and February (16°F).
Average rainfall in September
Greater Rochester International Airport, NY
- Average rainfall in September: 3"
The wettest month (with the highest rainfall) is August (3.3").
The driest months (with the least rainfall) are January and February (2").
Average rainfall days in September
Greater Rochester International Airport, NY
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is December (17 days).
The month with the least rainy days is July (9 days).
Average sea temperature in September
Greater Rochester International Airport, NY
- Average sea temperature in September: 66°F
The best month for swimming (with the highest average sea temperature) is August (70°F).
The coldest months (with the lowest average sea temperature) are February and March (36°F).
Average daylight in September /
Average sunshine in September
Greater Rochester International Airport, NY
- Average daylight in September: 12h and 3min
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: 7h
The months with the most sunshine are June and July (Average sunshine: 10h).
The months with the least sunshine are January, November and December (Average sunshine: 3h).
Average UV index in September
Greater Rochester International Airport, NY
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 8).
The months with the lowest UV index are January and December (UV index 1).
Greater Rochester International Airport, New York, USA
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