September weather forecast and climate
Sea Cliff, NY

The first month of the autumn, September, is still a warm month in Sea Cliff, New York, with temperature in the range of an average high of 73.4°F (23°C) and an average low of 63.5°F (17.5°C).

Temperature

In Sea Cliff, New York, the average high-temperature in September marginally drops, from a moderately hot 80.4°F (26.9°C) in August, to a still warm 73.4°F (23°C). In September, the average low-temperature is 63.5°F (17.5°C).

Humidity

The average relative humidity in September is 73%.

Rainfall

The month with the least rainfall in Sea Cliff, New York, is September when the rain falls for 12.9 days and typically collects 2.4" (61mm) of precipitation.

Snowfall

In Sea Cliff, New York, snow does not fall in May through October.

Ocean temperature

In Sea Cliff, in September, the average water temperature is 70.2°F (21.2°C).
Note: Swimming in 70.2°F (21.2°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

The average length of the day is 12.4h.

Sunshine

In Sea Cliff, the average sunshine is 9h.

UV index

In September, the average daily maximum UV index in Sea Cliff is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. 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. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in September in Sea Cliff?

In Sea Cliff, in September, the average high-temperature is 73.4°F (23°C), and the average low-temperature is 63.5°F (17.5°C).

What is the average humidity in September in Sea Cliff?

In September, the average relative humidity in Sea Cliff, New York, is 73%.

How much does it rain in Sea Cliff in September?

In Sea Cliff, New York, during September, the rain falls for 12.9 days and regularly aggregates up to 2.4" (61mm) of precipitation.

What is the driest month in Sea Cliff?

September is the month with the least rainfall in Sea Cliff. Rain falls for 12.9 days and accumulates 2.4" (61mm) of precipitation.

When it does not snow in Sea Cliff?

In Sea Cliff, New York, snow does not fall in May through October.

What is the ocean temperature in September in Sea Cliff?

In Sea Cliff, the average seawater temperature in September is 70.2°F (21.2°C). For swimming, a surface water temperature of 70.2°F (21.2°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).

How many hours of daylight does Sea Cliff have in September?

In September, the average length of the day is 12.4h.

How many hours of sunshine does Sea Cliff have in September?

In September, the average sunshine is 9h.

How high is the UV index in September in Sea Cliff?

The average daily maximum UV index in September in Sea Cliff, New York, is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.
Average temperature in September - Sea Cliff, NY
  • Average high temperature in September: 23°C

The warmest month (with the highest average high temperature) is July (27.5°C).
The month with the lowest average high temperature is January (2.5°C).

  • Average low temperature in September: 17.5°C

Months with the highest average low temperature are July and August (21.3°C).
The coldest month (with the lowest average low temperature) is January (-2.6°C).

Average pressure in September - Sea Cliff, NY
  • Average pressure in September: 1017.7mbar

The month with the highest atmospheric pressure is November (1019.2mbar).
The month with the lowest atmospheric pressure is June (1013.6mbar).

Average wind speed in September - Sea Cliff, NY
  • Average wind speed in September: 13.4km/h

The windiest month (with the highest average wind speed) is January (18km/h).
The calmest month (with the lowest average wind speed) is July (11.7km/h).

Average humidity in September - Sea Cliff, NY
  • Average humidity in September: 73%

Months with the highest relative humidity are February, May and December (75%).
Months with the lowest relative humidity are August and November (71%).

Average rainfall in September - Sea Cliff, NY
  • Average rainfall in September: 61mm

The wettest month (with the highest rainfall) is December (103mm).
The driest month (with the least rainfall) is September (61mm).

Average rainfall days in September - Sea Cliff, NY
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is January (9.3 days).

Average snowfall in September - Sea Cliff, NY
  • Average snowfall in September: 0mm

The month with the highest snowfall is March (51mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in September - Sea Cliff, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (6.8 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

Average sea temperature in September - Sea Cliff, NY
  • Average sea temperature in September: 21.2°C

The best month for swimming (with the highest average sea temperature) is August (23.4°C).
The coldest month (with the lowest average sea temperature) is February (4.4°C).

Average daylight in September / Average sunshine in September - Sea Cliff, NY
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 9h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is February (Average sunshine: 4.8h).

Average sunshine days in September - Sea Cliff, NY
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is November (18 days).
The month with the least sunshine days is July (10.6 days).

Average UV index in September - Sea Cliff, NY
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in September - Sea Cliff, NY
  • Average cloud cover in September: 33

Months with the most cloud cover are February and December (Cloud cover 47).
Months with the least cloud cover are July and August (Cloud cover 29).

Average visibility in September - Sea Cliff, NY
  • Average visibility in September: 10km

Months with the highest visibility are August, September and November (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, October and December (9km).