September weather forecast
Smithfield, PA

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Weather in September

September, the first month of the autumn in Smithfield, is also a moderately hot month, with an average temperature varying between 75.6°F (24.2°C) and 54.5°F (12.5°C).

Temperature

As August shifts into September, a minor alteration in temperatures is observed, with average highs reducing from a moderately hot 81.5°F (27.5°C) to a still warm 75.6°F (24.2°C). In the month of September, the average temperature dips to a fresh 54.5°F (12.5°C) during the night.

Humidity

In September, the average relative humidity is 78%.

Rainfall

The month with the least rainfall is September, when the rain falls for 10.2 days and typically collects 0.67" (17mm) of precipitation.

Snowfall

In Smithfield, snow does not fall in June through September.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:47 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:15 am and sunset at 7:02 pm EDT.

Sunshine

In September, the average sunshine is 8.8h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

Frequently asked questions

What are September temperatures?

The average high-temperature, in September, in Smithfield, is 75.6°F (24.2°C), while the average low-temperature is 54.5°F (12.5°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, in August is calculated to be 87.8°F (31°C).

What is the average humidity in September?

In Smithfield, the average relative humidity in September is 78%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 10.2 days and typically collects 0.67" (17mm) of precipitation.

How much does it rain in September?

In Smithfield, in September, during 10.2 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.

When it does not snow?

June through September are months without snowfall in Smithfield.

Does it snow in September?

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

How many hours of daylight does Smithfield have in September?

In Smithfield, the average day length in September is 12h and 26min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:47 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:02 pm EDT.

How many hours of sunshine does Smithfield have in September?

The average sunshine duration in September is 8.8h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe 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
Smithfield, PA

Average temperature in September - Smithfield, PA
  • Average high temperature in September: 75.6°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

Average pressure in September
Smithfield, PA

Average pressure in September - Smithfield, PA
  • Average pressure in September: 30.05"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
Smithfield, PA

Average wind speed in September - Smithfield, PA
  • Average wind speed in September: 4.9mph

The windiest month (with the highest average wind speed) is January (7.6mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

Average humidity in September
Smithfield, PA

Average humidity in September - Smithfield, PA
  • Average humidity in September: 78%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (77%).

Average rainfall in September
Smithfield, PA

Average rainfall in September - Smithfield, PA
  • Average rainfall in September: 0.67"

The wettest month (with the highest rainfall) is May (1.57").
The driest month (with the least rainfall) is September (0.67").

Average rainfall days in September
Smithfield, PA

Average rainfall days in September - Smithfield, PA
  • Average rainfall days in September: 10.2 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (8.2 days).

Average snowfall in September
Smithfield, PA

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

The month with the highest snowfall is January (2.83").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Smithfield, PA

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

The month with the highest number of snowfall days is January (16.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).

Average sunshine days in September
Smithfield, PA

Average sunshine days in September - Smithfield, PA
  • Average sunshine days in September: 16.7 days

The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is January (9.1 days).

Average UV index in September
Smithfield, PA

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

The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September
Smithfield, PA

Average cloud cover in September - Smithfield, PA
  • Average cloud cover in September: 38

The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 35).

Average visibility in September
Smithfield, PA

Average visibility in September - Smithfield, 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).

Smithfield, Pennsylvania, USA

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