September weather forecast and climate
Amsterdam, NJ

The first month of the autumn, September, is still a warm month in Amsterdam, New Jersey, with average temperature fluctuating between 55.2°F (12.9°C) and 74.5°F (23.6°C).

Temperature

In Amsterdam, the average high-temperature marginally drops, from 81.1°F (27.3°C) in August, to a still moderately hot 74.5°F (23.6°C). In September, in Amsterdam, the average low-temperature is 55.2°F (12.9°C).

Humidity

In Amsterdam, the average relative humidity is 79%.

Rainfall

September is the month with the least rainfall. Rain falls for 8.9 days and accumulates 0.71" (18mm) of precipitation.

Snowfall

May through October are months without snowfall in Amsterdam.

Daylight

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

Sunshine

In Amsterdam, the average sunshine in September is 8.8h.

UV index

In Amsterdam, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Amsterdam?

In September, the average high-temperature is 74.5°F (23.6°C), and the average low-temperature is 55.2°F (12.9°C).

What is the average humidity in September in Amsterdam?

In September, the average relative humidity in Amsterdam is 79%.

How many days does it rain in September in Amsterdam?

In Amsterdam, during September, the rain falls for 8.9 days and regularly aggregates up to 0.71" (18mm) of precipitation.

What is the driest month in Amsterdam?

September is the month with the least rainfall. Rain falls for 8.9 days and accumulates 0.71" (18mm) of precipitation.

When it does not snow in Amsterdam?

May through October are months without snowfall in Amsterdam.

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

In September, the average length of the day in Amsterdam, New Jersey, is 12.4h.

How long on average sun shines in September in Amsterdam?

In September, the average sunshine is 8.8h.

What is the UV index reading in September in Amsterdam?

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.
Average temperature in September - Amsterdam, NJ
  • Average high temperature in September: 23.6°C

The warmest month (with the highest average high temperature) is July (28.5°C).
The month with the lowest average high temperature is January (1.3°C).

  • Average low temperature in September: 12.9°C

The month with the highest average low temperature is July (17.7°C).
The coldest month (with the lowest average low temperature) is January (-5.8°C).

Average pressure in September - Amsterdam, NJ
  • Average pressure in September: 1017.9mbar

The month with the highest atmospheric pressure is November (1019.9mbar).
The month with the lowest atmospheric pressure is June (1013.8mbar).

Average wind speed in September - Amsterdam, NJ
  • Average wind speed in September: 8.9km/h

The windiest month (with the highest average wind speed) is March (13.1km/h).
The calmest month (with the lowest average wind speed) is August (7.9km/h).

Average humidity in September - Amsterdam, NJ
  • Average humidity in September: 79%

The month with the highest relative humidity is February (81%).
Months with the lowest relative humidity are April and July (76%).

Average rainfall in September - Amsterdam, NJ
  • Average rainfall in September: 18mm

The wettest month (with the highest rainfall) is July (42mm).
The driest month (with the least rainfall) is September (18mm).

Average rainfall days in September - Amsterdam, NJ
  • Average rainfall days in September: 8.9 days

The month with the highest number of rainy days is May (13.9 days).
The month with the least rainy days is January (7.1 days).

Average snowfall in September - Amsterdam, NJ
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (36mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in September - Amsterdam, NJ
  • Average snowfall days in September: 0 days

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

Average daylight in September / Average sunshine in September - Amsterdam, NJ
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 8.8h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is February (Average sunshine: 4.6h).

Average sunshine days in September - Amsterdam, NJ
  • Average sunshine days in September: 18.6 days

The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (14 days).

Average UV index in September - Amsterdam, NJ
  • Average UV index in September: 4

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

Average cloud cover in September - Amsterdam, NJ
  • Average cloud cover in September: 39

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in September - Amsterdam, NJ
  • Average visibility in September: 8km

Months with the highest visibility are January, March, April, November and December (9km).
Months with the lowest visibility are February, May, June, July, August, September and October (8km).