September weather forecast
Monessen, PA

Weather in September

September, the first month of the autumn in Monessen, is still a warm month, with an average temperature varying between 75.4°F (24.1°C) and 55°F (12.8°C).

Temperature

In September, the average high-temperature slightly decreases from 81.9°F (27.7°C) in August to a still warm 75.4°F (24.1°C). In Monessen, the average low-temperature is 55°F (12.8°C).

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Monessen, Pennsylvania, during September, the rain falls for 14.3 days and regularly aggregates up to 2.4" (61mm) of precipitation. Throughout the year, in Monessen, there are 191.3 rainfall days, and 35.24" (895mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

In Monessen, Pennsylvania, 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 7:51 pm. On the last day of September, in Monessen, Pennsylvania, sunrise is at 7:15 am and sunset at 7:03 pm EDT.

Sunshine

The average sunshine in September in Monessen is 8.7h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
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 the 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.
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FAQ

What is the average humidity in September in Monessen?

The average relative humidity in September in Monessen, Pennsylvania, is 78%.

How much does it rain in Monessen in September?

In Monessen, in September, during 14.3 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

When it does not snow in Monessen?

In Monessen, Pennsylvania, snow does not fall in June through September.

Does it snow in Monessen in September?

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

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

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

What time are sunrise and sunset in September in Monessen?

In September, on the first day of the month, sunrise is at 6:47 am and sunset at 7:51 pm. On the last day of the month, in Monessen, Pennsylvania, sunrise is at 7:15 am and sunset at 7:03 pm EDT.

How many hours of sunshine does Monessen have in September?

In September, the average sunshine duration is 8.7h.

How high is the UV index in September in Monessen?

In September, the average daily maximum UV index in Monessen, Pennsylvania, is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.

Average temperature in September
Monessen, PA

Average temperature in September - Monessen, PA
  • Average high temperature in September: 75.4°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in September: 55°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

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Average pressure in September
Monessen, PA

Average pressure in September - Monessen, 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).

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Average wind speed in September
Monessen, PA

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

The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).

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Average humidity in September
Monessen, PA

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

The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is August (76%).

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Average rainfall in September
Monessen, PA

Average rainfall in September - Monessen, PA
  • Average rainfall in September: 2.4"

The wettest month (with the highest rainfall) is May (3.78").
The driest month (with the least rainfall) is November (2.13").

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Average rainfall days in September
Monessen, PA

Average rainfall days in September - Monessen, PA
  • Average rainfall days in September: 14.3 days

The month with the highest number of rainy days is May (21.8 days).
The months with the least rainy days are January and February (11.7 days).

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Average snowfall in September
Monessen, PA

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

The month with the highest snowfall is January (6.26").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Monessen, PA

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

The month with the highest number of snowfall days is January (17.8 days).
The 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
Monessen, PA

Average daylight in September / Average sunshine in September - Monessen, PA
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 59min).
The month with the shortest days is December (Average daylight: 9h and 22min).

  • Average sunshine in September: 8.7h

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
Monessen, PA

Average sunshine days in September - Monessen, PA
  • Average sunshine days in September: 13.7 days

The month with the most sunshine days is November (14.3 days).
The month with the least sunshine days is January (6.8 days).

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Average UV index in September
Monessen, PA

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

The 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
Monessen, PA

Average cloud cover in September - Monessen, PA
  • Average cloud cover in September: 37

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
Monessen, PA

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

The months with the highest visibility are April, August and November (6mi).
The months with the lowest visibility are January and February (4mi).

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