September weather forecast
Bethel Park, PA

Weather in September

September, the first month of the autumn, in Bethel Park, is also a moderately hot month, with average temperature varying between 75.7°F (24.3°C) and 55.6°F (13.1°C).

Temperature

In September, the average high-temperature slightly decreases, from a warm 82.2°F (27.9°C) in August, to a still moderately hot 75.7°F (24.3°C). In September, the average low-temperature is 55.6°F (13.1°C).

Humidity

In September, the average relative humidity in Bethel Park is 77%.

Rainfall

In Bethel Park, during September, the rain falls for 14.3 days and regularly aggregates up to 2.52" (64mm) of precipitation. Throughout the year, there are 187.9 rainfall days, and 35.59" (904mm) of precipitation is accumulated.

Snowfall

In Bethel Park snow does not fall in June through September.

Daylight

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

Sunshine

The average sunshine in Bethel Park is 8.5h.

UV index

In Bethel Park, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the average humidity in September in Bethel Park?

The average relative humidity in September in Bethel Park, Pennsylvania, is 77%.

How much does it rain in Bethel Park in September?

In Bethel Park, Pennsylvania, in September, during 14.3 rainfall days, 2.52" (64mm) of precipitation is typically accumulated.

When it does not snow in Bethel Park?

June through September are months without snowfall.

Does it snow in Bethel Park in September?

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

What is the average length of the day in September in Bethel Park?

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

How many hours of sunshine does Bethel Park have in September?

The average sunshine in September in Bethel Park is 8.5h.

How high is the UV index in September in Bethel Park?

In September, the average daily maximum UV index in Bethel Park, Pennsylvania, is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Bethel Park, PA

Average temperature in September - Bethel Park, PA
  • Average high temperature in September: 75.7°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in September: 55.6°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (21°F).

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Average pressure in September
Bethel Park, PA

Average pressure in September - Bethel Park, PA
  • Average pressure in September: 30.05"

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

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Average wind speed in September
Bethel Park, PA

Average wind speed in September - Bethel Park, PA
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

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Average humidity in September
Bethel Park, PA

Average humidity in September - Bethel Park, PA
  • Average humidity in September: 77%

Months with the highest relative humidity are January and February (84%).
Months with the lowest relative humidity are July and August (75%).

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Average rainfall in September
Bethel Park, PA

Average rainfall in September - Bethel Park, PA
  • Average rainfall in September: 2.52"

The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is November (2.2").

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Average rainfall days in September
Bethel Park, PA

Average rainfall days in September - Bethel Park, PA
  • Average rainfall days in September: 14.3 days

The month with the highest number of rainy days is May (21.5 days).
The month with the least rainy days is February (11.3 days).

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Average snowfall in September
Bethel Park, PA

Average snowfall in September - Bethel Park, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (5.83").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Bethel Park, PA

Average snowfall days in September - Bethel Park, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (17.1 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Bethel Park, PA

Average daylight in September / Average sunshine in September - Bethel Park, PA
  • 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: 8.5h

The month with the most sunshine is August (Average sunshine: 10.2h).
The month with the least sunshine is January (Average sunshine: 3h).

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Average sunshine days in September
Bethel Park, PA

Average sunshine days in September - Bethel Park, PA
  • Average sunshine days in September: 13.5 days

The month with the most sunshine days is November (15.1 days).
The month with the least sunshine days is January (7.7 days).

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Average UV index in September
Bethel Park, PA

Average UV index in September - Bethel Park, PA
  • Average UV index in September: 4

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

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Average cloud cover in September
Bethel Park, PA

Average cloud cover in September - Bethel Park, 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 33).

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Average visibility in September
Bethel Park, PA

Average visibility in September - Bethel Park, PA
  • Average visibility in September: 5mi

Months with the highest visibility are April, June, July, August and November (6mi).
Months with the lowest visibility are January and February (4mi).

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