September weather forecast
Hewlett Harbor, NY

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Weather in September

The first month of the autumn, September, is still a pleasant month in Hewlett Harbor, New York, with an average temperature varying between 64.2°F (17.9°C) and 73.2°F (22.9°C).

Temperature

In Hewlett Harbor, entering September brings a subtle temperature decrement, reducing from August's moderately hot 79.9°F (26.6°C) to a pleasant 73.2°F (22.9°C). The month of September in Hewlett Harbor shows a minor drop from daytime temperatures, generally recording a low average of 64.2°F (17.9°C).

Humidity

The average relative humidity in September is 74%.

Rainfall

In September, in Hewlett Harbor, the rain falls for 12.4 days. Throughout September, 1.38" (35mm) of precipitation is accumulated. In Hewlett Harbor, during the entire year, the rain falls for 135.3 days and collects up to 18.62" (473mm) of precipitation.

Snowfall

April through September are months without snowfall.

Ocean temperature

In Hewlett Harbor, in September, the average water temperature is 70.2°F (21.2°C).
Note: In water of 70.2°F (21.2°C), the majority of people do not enjoy swimming. Breathing becomes increasingly hard to manage as the temperature drops from 69.8°F (21°C) to 59°F (15°C).

Daylight

In September, the average length of the day in Hewlett Harbor is 12h and 27min.
On the first day of the month, sunrise is at 6:22 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:38 pm EDT.

Sunshine

The average sunshine in September is 9.1h.

UV index

The average daily maximum UV index in September in Hewlett Harbor, New York, is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: In September, an average UV index of 5 transforms into the following instructions:
Take necessary precautions - Defending against sun damage is advocated. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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Frequently asked questions

What is the temperature in September in Hewlett Harbor?

September temperatures in Hewlett Harbor, New York, vary between a high-temperature of 73.2°F (22.9°C) and a low-temperature of 64.2°F (17.9°C). The average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in July is estimated at 84.2°F (29°C).

What is the average humidity in September in Hewlett Harbor?

The average relative humidity in September is 74%.

How many days does it rain in September in Hewlett Harbor?

In September, in Hewlett Harbor, the rain falls for 12.4 days. Throughout September, 1.38" (35mm) of precipitation is accumulated.

When it does not snow in Hewlett Harbor?

In Hewlett Harbor, New York, snow does not fall in April through September.

Does it snow in Hewlett Harbor in September?

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

What is the ocean temperature in September in Hewlett Harbor?

In September, the average ocean temperature is 70.2°F (21.2°C). For most, swimming in 70.2°F (21.2°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).

What is the average length of the day in September in Hewlett Harbor?

The average day length in September in Hewlett Harbor, New York, is 12h and 27min.

When are sunrise and sunset in September in Hewlett Harbor?

In September, on the first day of the month, sunrise is at 6:22 am and sunset at 7:26 pm. On the last day of the month, in Hewlett Harbor, sunrise is at 6:50 am and sunset at 6:38 pm EDT.

How long on average sun shines in September in Hewlett Harbor?

The average sunshine duration in September is 9.1h.

How high is the UV index in September in Hewlett Harbor?

In Hewlett Harbor, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Hewlett Harbor, NY

Average temperature in September - Hewlett Harbor, NY
  • Average high temperature in September: 73.2°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in September: 64.2°F

The month with the highest average low temperature is August (71.1°F).
The coldest month (with the lowest average low temperature) is January (28.2°F).

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Average pressure in September
Hewlett Harbor, NY

Average pressure in September - Hewlett Harbor, NY
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Hewlett Harbor, NY

Average wind speed in September - Hewlett Harbor, NY
  • Average wind speed in September: 9.1mph

The windiest month (with the highest average wind speed) is January (12.4mph).
The calmest month (with the lowest average wind speed) is July (8mph).

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Average humidity in September
Hewlett Harbor, NY

Average humidity in September - Hewlett Harbor, NY
  • Average humidity in September: 74%

The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is November (72%).

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Average rainfall in September
Hewlett Harbor, NY

Average rainfall in September - Hewlett Harbor, NY
  • Average rainfall in September: 1.38"

The wettest months (with the highest rainfall) are July and August (2.32").
The driest month (with the least rainfall) is January (0.91").

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Average rainfall days in September
Hewlett Harbor, NY

Average rainfall days in September - Hewlett Harbor, NY
  • Average rainfall days in September: 12.4 days

The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is January (7.3 days).

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Average snowfall in September
Hewlett Harbor, NY

Average snowfall in September - Hewlett Harbor, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (1.02").
The months with the least snowfall are April, May, June, July, August and September (0").

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Average snowfall days in September
Hewlett Harbor, NY

Average snowfall days in September - Hewlett Harbor, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in September
Hewlett Harbor, NY

Average sea temperature in September - Hewlett Harbor, NY
  • Average sea temperature in September: 70.1°F

The best month for swimming (with the highest average sea temperature) is August (74.1°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).

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Average daylight in September /
Average sunshine in September
Hewlett Harbor, NY

Average daylight in September / Average sunshine in September - Hewlett Harbor, NY
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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Average sunshine days in September
Hewlett Harbor, NY

Average sunshine days in September - Hewlett Harbor, NY
  • Average sunshine days in September: 15.6 days

The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is July (13.6 days).

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Average UV index in September
Hewlett Harbor, NY

Average UV index in September - Hewlett Harbor, NY
  • Average UV index in September: 5

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

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Average cloud cover in September
Hewlett Harbor, NY

Average cloud cover in September - Hewlett Harbor, NY
  • Average cloud cover in September: 32

The months with the most cloud cover are February and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in September
Hewlett Harbor, NY

Average visibility in September - Hewlett Harbor, NY
  • Average visibility in September: 6mi

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

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Hewlett Harbor, New York, USA

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