Rochester
New York, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Rochester, NY

The High Falls in Rochester, New York, and the distant view of the city
The High Falls in Rochester, New York, and the distant view of the city
The first month of the autumn, September, is still a pleasant month in Rochester, New York, with average temperature ranging between min 52°F (11.1°C) and max 71.6°F (22°C).

Temperature

In September, the average high-temperature slightly decreases, from a warm 79.2°F (26.2°C) in August, to a pleasant 71.6°F (22°C). The average low-temperature, in Rochester, is 52°F (11.1°C).

Humidity

In Rochester, the average relative humidity in September is 76.8%.

Rainfall

In Rochester, in September, it is raining for 11.5 days, with typically 3.4" (85.9mm) of accumulated precipitation. In Rochester, during the entire year, the rain falls for 166.8 days and collects up to 34.3" (870.4mm) of precipitation.

Snowfall

June through September are months without snowfall.

Ocean temperature

In Rochester, the average water temperature is 68.5°F (20.3°C).
Note: For swimming, a surface water temperature of 68.5°F (20.3°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

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

Sunshine

In Rochester, the average sunshine in September is 7.1h.

What is the temperature in September in Rochester?

In September, in Rochester, the average high-temperature is 71.6°F (22°C), and the average low-temperature is 52°F (11.1°C).

What is the average humidity in September in Rochester?

In September, the average relative humidity in Rochester, New York, is 76.8%.

How many days does it rain in September in Rochester?

In Rochester, New York, in September, during 11.5 rainfall days, 3.4" (85.9mm) of precipitation is typically accumulated.

Does it snow in Rochester in September?

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

When it does not snow in Rochester?

June through September are months without snowfall in Rochester, New York.

What is the ocean temperature in September in Rochester?

In Rochester, New York, the average seawater temperature in September is 68.5°F (20.3°C). For swimming, a surface water temperature of 68.5°F (20.3°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

What is the average length of the day in September in Rochester?

The average length of the day in September in Rochester is 12.5h.

How long on average sun shines in September in Rochester?

The average sunshine in September is 7.1h.
Average temperature in September - Rochester, NY
  • Average high temperature in September: 71.6°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.7°F).

  • Average low temperature in September: 52°F

The month with the highest average low temperature is July (60.7°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).

Average humidity in September - Rochester, NY
  • Average humidity in September: 76.8%

The month with the highest relative humidity is December (77.5%).
The month with the lowest relative humidity is April (67%).

Average rainfall in September - Rochester, NY
  • Average rainfall in September: 3.4"

The wettest month (with the highest rainfall) is August (3.5").
The driest month (with the lowest rainfall) is February (2").

Average rainfall days in September - Rochester, NY
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is January (19.4 days).
Months with the lowest number of rainy days are July and August (10.8 days).

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

The month with the highest snowfall is January (28.2").
Months with the lowest snowfall are June, July, August and September (0").

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 (18 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

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).

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 shortest days is December (Average daylight: 9h).

  • Average sunshine in September: 7.1h

The month with most sunshine is July (Average sunshine: 10.1h).
The month with least sunshine is December (Average sunshine: 2.5h).