September weather forecast
Northampton, PA

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Weather in September

The first month of the autumn, September, is still a warm month in Northampton, Pennsylvania, with an average temperature fluctuating between 74.1°F (23.4°C) and 55°F (12.8°C).

Temperature

The beginning of September brings a minor change in the average high-temperature, shifting from 81°F (27.2°C) in August to a still warm 74.1°F (23.4°C). September nights observe an average temperature dip to a cool 55°F (12.8°C).

Humidity

The average relative humidity in September is 79%.

Rainfall

September is the month with the least rainfall. Rain falls for 11.6 days and accumulates 1.93" (49mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 27min.
On the first day of the month, sunrise is at 6:29 am and sunset at 7:33 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:45 pm EDT.

Sunshine

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

UV index

In Northampton, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In September, an average UV index of 4 transforms into the following instructions:
Take necessary precautions - Defending against sun damage is advocated. To protect against the Sun's most potent rays, avoid direct exposure around midday. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.

Frequently asked questions

What is the average September temperature?

The average high-temperature, in September, in Northampton, is 74.1°F (23.4°C), while the average low-temperature is 55°F (12.8°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, is calculated to be 86°F (30°C).

What is the average humidity in September?

The average relative humidity in September is 79%.

What is the driest month?

September is the month with the least rainfall in Northampton. Rain falls for 11.6 days and accumulates 1.93" (49mm) of precipitation.

How many days does it rain in September in Northampton?

In Northampton, in September, during 11.6 rainfall days, 1.93" (49mm) of precipitation is typically accumulated.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

How many hours of daylight does Northampton have in September?

The average day length in September is 12h and 27min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:29 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm EDT.

How many hours of sunshine does Northampton have in September?

In Northampton, the average sunshine duration in September is 8.8h.

How high is the UV index in September?

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
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
Northampton, PA

Average temperature in September - Northampton, PA
  • Average high temperature in September: 74.1°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in September: 55°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in September
Northampton, PA

Average pressure in September - Northampton, PA
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Northampton, PA

Average wind speed in September - Northampton, PA
  • Average wind speed in September: 5.5mph

The windiest months (with the highest average wind speed) are January and March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in September
Northampton, PA

Average humidity in September - Northampton, PA
  • Average humidity in September: 79%

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

Average rainfall in September
Northampton, PA

Average rainfall in September - Northampton, PA
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is July (3.19").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days in September
Northampton, PA

Average rainfall days in September - Northampton, PA
  • Average rainfall days in September: 11.6 days

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (9.9 days).

Average snowfall in September
Northampton, PA

Average snowfall in September - Northampton, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (4.88").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Northampton, PA

Average snowfall days in September - Northampton, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Northampton, PA

Average daylight in September / Average sunshine in September - Northampton, PA
  • 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: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in September
Northampton, PA

Average sunshine days in September - Northampton, PA
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is February (11.7 days).

Average UV index in September
Northampton, PA

Average UV index in September - Northampton, PA
  • Average UV index in September: 4

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

Average cloud cover in September
Northampton, PA

Average cloud cover in September - Northampton, PA
  • Average cloud cover in September: 39

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in September
Northampton, PA

Average visibility in September - Northampton, PA
  • Average visibility in September: 5mi

The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).

Northampton, Pennsylvania, USA

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