September weather forecast and climate
Middle Island, NY

The first month of the autumn, September, is also an agreeable month in Middle Island, New York, with average temperature fluctuating between 64.9°F (18.3°C) and 72.1°F (22.3°C).

Temperature

In Middle Island, New York, the average high-temperature in September marginally drops, from a moderately hot 78.3°F (25.7°C) in August, to a pleasant 72.1°F (22.3°C). The average low-temperature, in September, is 64.9°F (18.3°C).

Humidity

The average relative humidity in Middle Island is 74%.

Rainfall

In Middle Island, New York, during September, the rain falls for 12.6 days and regularly aggregates up to 2.32" (59mm) of precipitation. In Middle Island, during the entire year, the rain falls for 153 days and collects up to 35.04" (890mm) of precipitation.

Snowfall

April, June through November are months without snowfall.

Daylight

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

Sunshine

In September, the average sunshine is 8.9h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. 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.

What is the temperature in September in Middle Island?

In September, the average high-temperature is 72.1°F (22.3°C), and the average low-temperature is 64.9°F (18.3°C).

What is the average humidity in September in Middle Island?

In Middle Island, the average relative humidity in September is 74%.

How much does it rain in Middle Island in September?

In Middle Island, in September, during 12.6 rainfall days, 2.32" (59mm) of precipitation is typically accumulated.

When it does not snow in Middle Island?

April, June through November are months without snowfall in Middle Island, New York.

How many hours of daylight does Middle Island have in September?

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

How many hours of sunshine does Middle Island have in September?

In September, the average sunshine is 8.9h.

How high is the UV index in September in Middle Island?

In Middle Island, New York, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.
Average temperature in September - Middle Island, NY
  • Average high temperature in September: 22.3°C

The warmest months (with the highest average high temperature) are July and August (25.7°C).
The month with the lowest average high temperature is January (3.3°C).

  • Average low temperature in September: 18.3°C

Months with the highest average low temperature are July and August (21.6°C).
The coldest month (with the lowest average low temperature) is January (-1.4°C).

Average pressure in September - Middle Island, NY
  • Average pressure in September: 1017.6mbar

The month with the highest atmospheric pressure is November (1018.9mbar).
The month with the lowest atmospheric pressure is June (1013.6mbar).

Average wind speed in September - Middle Island, NY
  • Average wind speed in September: 16.5km/h

The windiest month (with the highest average wind speed) is January (21.8km/h).
The calmest month (with the lowest average wind speed) is July (14km/h).

Average humidity in September - Middle Island, NY
  • Average humidity in September: 74%

Months with the highest relative humidity are May and June (78%).
The month with the lowest relative humidity is November (71%).

Average rainfall in September - Middle Island, NY
  • Average rainfall in September: 59mm

The wettest month (with the highest rainfall) is December (97mm).
The driest month (with the least rainfall) is January (57mm).

Average rainfall days in September - Middle Island, NY
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is January (8 days).

Average snowfall in September - Middle Island, NY
  • Average snowfall in September: 0mm

The month with the highest snowfall is March (55mm).
Months with the least snowfall are April, June, July, August, September, October and November (0mm).

Average snowfall days in September - Middle Island, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4.6 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Middle Island, 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: 8.9h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.7h).

Average sunshine days in September - Middle Island, NY
  • Average sunshine days in September: 15.8 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is August (12.5 days).

Average UV index in September - Middle Island, 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 and December (UV index 2).

Average cloud cover in September - Middle Island, NY
  • Average cloud cover in September: 33

The month with the most cloud cover is December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 28).

Average visibility in September - Middle Island, NY
  • Average visibility in September: 10km

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