September weather forecast
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 also an agreeable month in Rochester, New York, with an average temperature varying between 56.1°F (13.4°C) and 71.1°F (21.7°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, in September, the average low-temperature is 56.1°F (13.4°C).

Humidity

August and September, with an average relative humidity of 76%, are the least humid months.

Rainfall

The month with the least rainfall is September, when the rain falls for 13.9 days and typically collects 1.85" (47mm) of precipitation.

Snowfall

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

Ocean temperature

In September, the average ocean 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

The average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:34 am and sunset at 7:45 pm. On the last day of September, in Rochester, New York, sunrise is at 7:06 am and sunset at 6:53 pm EDT.

Sunshine

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

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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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 is the least humid month in Rochester?

August and September, with an average relative humidity of 76%, are the least humid months in Rochester, New York.

What is the average humidity in September in Rochester?

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

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.

How much does it rain in Rochester in September?

In Rochester, in September, during 13.9 rainfall days, 1.85" (47mm) of precipitation is typically accumulated.

When it does not snow in Rochester?

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

Does it snow in Rochester in September?

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

What is the ocean temperature in September in Rochester?

In Rochester, in September, the average water temperature is 68.5°F (20.3°C). Swimming in 68.5°F (20.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Rochester have in September?

In September, the average day length in Rochester is 12h and 29min.

When are sunrise and sunset in September in Rochester?

On the first day of September, sunrise is at 6:34 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:53 pm EDT.

How many hours of sunshine does Rochester have in September?

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

What is the UV index reading in September in Rochester?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"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).

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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%

The months with the highest relative humidity are January and February (84%).
The 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").
The 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).
The 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: 12h and 29min

The month with the longest days is June (Average daylight: 15h and 20min).
The month with the shortest days is December (Average daylight: 9h and 3min).

  • Average sunshine in September: 9h and 18min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 2h and 42min).

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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).
The 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

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

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