September weather forecast
Mill Creek, PA

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Weather in September

September, the first month of the autumn in Mill Creek, is still a warm month, with an average temperature ranging between max 74.3°F (23.5°C) and min 53.2°F (11.8°C).

Temperature

Mill Creek, Pennsylvania, records a mild change in average high-temperature during September, easing from 81.3°F (27.4°C) in August to a still moderately hot 74.3°F (23.5°C). In September, Mill Creek experiences an average nighttime temperature of 53.2°F (11.8°C).

Humidity

In September, the average relative humidity is 79%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.8 days and accumulates 1.85" (47mm) of precipitation.

Snowfall

In Mill Creek, snow does not fall in May through September.

Daylight

In September, the average length of the day is 12h and 27min.
On the first day of September, sunrise is at 6:39 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:55 pm EDT.

Sunshine

The average sunshine in September is 8.6h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 4 in September translates into this advice:
Undertake precautions - Obligation exists to protect against skin and eye damage. To avoid the Sun's strongest rays, limit exposure around the mid-day period. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.

Frequently asked questions

What is the temperature in September?

September temperatures vary between a high-temperature of 74.3°F (23.5°C) and a low-temperature of 53.2°F (11.8°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 estimated at 86°F (30°C).

What is the average humidity in September?

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

What is the driest month?

September is the month with the least rainfall. Rain falls for 12.8 days and accumulates 1.85" (47mm) of precipitation.

How many days does it rain in September?

In Mill Creek, Pennsylvania, in September, it is raining for 12.8 days, with typically 1.85" (47mm) of accumulated precipitation.

When it does not snow in Mill Creek?

May through September are months without snowfall.

Does it snow in September?

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

What is the average length of the day in September?

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

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:39 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:55 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.6h.

What is the UV index intensity in September?

In Mill Creek, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability 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
Mill Creek, PA

Average temperature in September - Mill Creek, PA
  • Average high temperature in September: 74.3°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (32.9°F).

  • Average low temperature in September: 53.2°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).

Average pressure in September
Mill Creek, PA

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

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in September
Mill Creek, PA

Average wind speed in September - Mill Creek, PA
  • Average wind speed in September: 4.8mph

The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).

Average humidity in September
Mill Creek, PA

Average humidity in September - Mill Creek, PA
  • Average humidity in September: 79%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is July (75%).

Average rainfall in September
Mill Creek, PA

Average rainfall in September - Mill Creek, PA
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is September (1.85").

Average rainfall days in September
Mill Creek, PA

Average rainfall days in September - Mill Creek, PA
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (9.5 days).

Average snowfall in September
Mill Creek, PA

Average snowfall in September - Mill Creek, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (5.24").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Mill Creek, PA

Average snowfall days in September - Mill Creek, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Mill Creek, PA

Average daylight in September / Average sunshine in September - Mill Creek, PA
  • Average daylight in September: 12h and 2min

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 4min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

Average sunshine days in September
Mill Creek, PA

Average sunshine days in September - Mill Creek, PA
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is November (16.7 days).
The month with the least sunshine days is May (10.7 days).

Average UV index in September
Mill Creek, PA

Average UV index in September - Mill Creek, PA
  • Average UV index in September: 4

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

Average cloud cover in September
Mill Creek, PA

Average cloud cover in September - Mill Creek, PA
  • Average cloud cover in September: 39

The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are July and August (Cloud cover 34).

Average visibility in September
Mill Creek, PA

Average visibility in September - Mill Creek, PA
  • Average visibility in September: 5mi

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

Mill Creek, Pennsylvania, USA

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