September weather forecast and climate
Rochester, NY

Amazing High Falls in Rochester, New York, USA
Amazing High Falls in Rochester, New York, USA

Weather in September

The first month of the autumn, September, is still a pleasant month in Rochester, New York, with temperature in the range of an average high of 71.1°F (21.7°C) and an average low of 56.1°F (13.4°C).

Temperature

In September, the average high-temperature slightly decreases, from a moderately hot 76.6°F (24.8°C) in August, to an agreeable 71.1°F (21.7°C). In Rochester, the average low-temperature is 56.1°F (13.4°C).

Humidity

Months with the lowest humidity in Rochester, New York, are August and September, with an average relative humidity of 76%.

Rainfall

September is the month with the least rainfall. Rain falls for 13.9 days and accumulates 1.85" (47mm) of precipitation.

Snowfall

In Rochester snow does not fall in June through September.

Ocean temperature

In Rochester, New York, the average seawater temperature is 68.5°F (20.3°C).
Note: For most, swimming in 68.5°F (20.3°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

In September, the average length of the day is 12.5h.

Sunshine

The average sunshine in September is 9.3h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Rochester?

In Rochester, New York, in September, the average high-temperature is 71.1°F (21.7°C), and the average low-temperature is 56.1°F (13.4°C).

What are the least humid months in Rochester?

Months with the lowest humidity in Rochester, New York, are August and September, with an average relative humidity of 76%.

What is the average humidity in September in Rochester?

The average relative humidity in September in Rochester, New York, is 76%.

How many days does it rain in September in Rochester?

In Rochester, during September, the rain falls for 13.9 days and regularly aggregates up to 1.85" (47mm) of precipitation.

What is the driest month in Rochester?

September is the month with the least rainfall. Rain falls for 13.9 days and accumulates 1.85" (47mm) of precipitation.

Does it snow in Rochester in September?

In Rochester, New York, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Rochester?

In Rochester, New York, snow does not fall in June through September.

What is the ocean temperature in September in Rochester?

In September, the average ocean temperature is 68.5°F (20.3°C). For most, swimming in 68.5°F (20.3°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

How many hours of daylight does Rochester have in September?

In Rochester, New York, the average length of the day in September is 12.5h.

How many hours of sunshine does Rochester have in September?

In September, the average sunshine in Rochester, New York, is 9.3h.

What is the UV index intensity in September in Rochester?

In Rochester, New York, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in September
Rochester, NY

Average temperature in September - Rochester, NY
  • Average high temperature in September: 71.1°F

The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (29.3°F).

  • Average low temperature in September: 56.1°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in September
Rochester, NY

Average pressure in September - Rochester, NY
  • Average pressure in September: 30.05"

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in September
Rochester, NY

Average wind speed in September - Rochester, NY
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is January (11.6mph).
The calmest month (with the lowest average wind speed) is July (7mph).

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Average humidity in September
Rochester, NY

Average humidity in September - Rochester, NY
  • Average humidity in September: 76%

Months with the highest relative humidity are January and February (84%).
Months with the lowest relative humidity are August and September (76%).

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Average rainfall in September
Rochester, NY

Average rainfall in September - Rochester, NY
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is May (2.99").
The driest month (with the least rainfall) is September (1.85").

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Average rainfall days in September
Rochester, NY

Average rainfall days in September - Rochester, NY
  • Average rainfall days in September: 13.9 days

The month with the highest number of rainy days is August (18.7 days).
The month with the least rainy days is February (7.8 days).

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Average snowfall in September
Rochester, NY

Average snowfall in September - Rochester, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is February (7.01").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Rochester, NY

Average snowfall days in September - Rochester, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (17.6 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Rochester, NY

Average sea temperature in September - Rochester, NY
  • Average sea temperature in September: 68.6°F

The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is March (35.8°F).

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Average daylight in September /
Average sunshine in September
Rochester, NY

Average daylight in September / Average sunshine in September - Rochester, NY
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in September: 9.3h

The month with the most sunshine is July (Average sunshine: 10.6h).
Months with the least sunshine are January and February (Average sunshine: 2.7).

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Average sunshine days in September
Rochester, NY

Average sunshine days in September - Rochester, NY
  • Average sunshine days in September: 13.9 days

The month with the most sunshine days is September (13.9 days).
The month with the least sunshine days is February (6.7 days).

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Average UV index in September
Rochester, NY

Average UV index in September - Rochester, NY
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in September
Rochester, NY

Average cloud cover in September - Rochester, NY
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is August (Cloud cover 28).

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Average visibility in September
Rochester, NY

Average visibility in September - Rochester, NY
  • Average visibility in September: 6mi

Months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January and February (5mi).

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