September weather forecast
Bellevue, PA

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Weather in September

September, the first month of the autumn in Bellevue, is also a moderately hot month, with temperature in the range of an average high of 75.7°F (24.3°C) and an average low of 55.9°F (13.3°C).

Temperature

As September arrives, Bellevue's weather displays a minor decrease in high-temperatures, transitioning from August's moderately hot 82.2°F (27.9°C) to a still warm 75.7°F (24.3°C). In the month of September, an average of 55.9°F (13.3°C) marks the low-temperature.

Humidity

In Bellevue, the average relative humidity in September is 76%.

Rainfall

In Bellevue, during September, the rain falls for 12.9 days and regularly aggregates up to 2.13" (54mm) of precipitation. In Bellevue, during the entire year, the rain falls for 163.6 days and collects up to 26.93" (684mm) of precipitation.

Snowfall

In Bellevue, 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 6:48 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:03 pm EDT.

Sunshine

In September, the average sunshine is 8.2h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: In September, a daily UV index of 4 turns into the following recommendations:
Guard yourself - Avoiding sunburn is suggested. Around midday, solar radiation is most harmful; hence, exposure should be limited. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Updated: Jul 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

The high-temperature during September is 75.7°F (24.3°C) and the low-temperature is 55.9°F (13.3°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is calculated to be 87.8°F (31°C).

What is the average humidity in September?

In Bellevue, the average relative humidity in September is 76%.

How many days does it rain in September?

In September, the rain falls for 12.9 days. Throughout September, 2.13" (54mm) of precipitation is accumulated.

When it does not snow?

May through September are months without snowfall.

Does it snow in Bellevue in September?

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

What is the average length of the day in September?

In September, the average day length is 12h and 27min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:48 am and sunset at 7:51 pm. On the last day of the month, in Bellevue, Pennsylvania, sunrise is at 7:16 am and sunset at 7:03 pm EDT.

How many hours of sunshine does Bellevue have in September?

In Bellevue, the average sunshine duration in September is 8.2h.

What is the UV index reading in September?

The average daily maximum UV index in September in Bellevue, Pennsylvania, is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
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
Bellevue, PA

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

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (33.1°F).

  • Average low temperature in September: 55.9°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (21°F).

Average pressure in September
Bellevue, PA

Average pressure in September - Bellevue, PA
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in September
Bellevue, PA

Average wind speed in September - Bellevue, PA
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is January (8mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

Average humidity in September
Bellevue, PA

Average humidity in September - Bellevue, PA
  • Average humidity in September: 76%

The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are July and August (73%).

Average rainfall in September
Bellevue, PA

Average rainfall in September - Bellevue, PA
  • Average rainfall in September: 2.13"

The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is November (1.54").

Average rainfall days in September
Bellevue, PA

Average rainfall days in September - Bellevue, PA
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is May (18.9 days).
The month with the least rainy days is January (8.9 days).

Average snowfall in September
Bellevue, PA

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

The month with the highest snowfall is January (3.31").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Bellevue, PA

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

The month with the highest number of snowfall days is January (14.4 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
Bellevue, PA

Average daylight in September / Average sunshine in September - Bellevue, 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 1min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).

Average sunshine days in September
Bellevue, PA

Average sunshine days in September - Bellevue, PA
  • Average sunshine days in September: 13.8 days

The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is February (9.6 days).

Average UV index in September
Bellevue, PA

Average UV index in September - Bellevue, 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).

Average cloud cover in September
Bellevue, PA

Average cloud cover in September - Bellevue, PA
  • Average cloud cover in September: 40

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 34).

Average visibility in September
Bellevue, PA

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

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

Bellevue, Pennsylvania, USA

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