September weather forecast
Fullerton, PA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Fullerton, Pennsylvania, with an average temperature varying between 74.3°F (23.5°C) and 55°F (12.8°C).

Temperature

September marks a gentle change in average high-temperature, declining from August's 81°F (27.2°C) to a still warm 74.3°F (23.5°C). An average minimum temperature of 55°F (12.8°C) marks the month of September.

Humidity

In September, the average relative humidity is 79%.

Rainfall

September is the month with the least rainfall. Rain falls for 11.5 days and accumulates 1.61" (41mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 27min.
On the first day of September, sunrise is at 6:29 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm EDT.

Sunshine

The average sunshine in September is 8.7h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.
Note: In September, an average UV index of 4 transforms into the following instructions:
Take precautions - Protection against sunburn is recommended. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.

Frequently asked questions

What are September temperatures in Fullerton?

Fullerton in September has an average high-temperature of 74.3°F (23.5°C) and an average low-temperature of 55°F (12.8°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, is computed to be 86°F (30°C).

What is the average humidity in September?

The average relative humidity in September is 79%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 11.5 days and accumulates 1.61" (41mm) of precipitation.

How many days does it rain in September?

In Fullerton, in September, during 11.5 rainfall days, 1.61" (41mm) of precipitation is typically accumulated.

When it does not snow?

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

Does it snow in September?

In Fullerton, 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 is the sunrise / sunset in September?

On the first day of September in Fullerton, sunrise is at 6:29 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm EDT.

How many hours of sunshine does Fullerton have in September?

In September, the average sunshine duration is 8.7h.

What is the UV index reading in September?

In Fullerton, the average daily maximum UV index in September 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
Fullerton, PA

Average temperature in September - Fullerton, PA
  • Average high temperature in September: 74.3°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 (34°F).

  • Average low temperature in September: 55°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in September
Fullerton, PA

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

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Fullerton, PA

Average wind speed in September - Fullerton, PA
  • Average wind speed in September: 5.5mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in September
Fullerton, PA

Average humidity in September - Fullerton, PA
  • Average humidity in September: 79%

The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).

Average rainfall in September
Fullerton, PA

Average rainfall in September - Fullerton, PA
  • Average rainfall in September: 1.61"

The wettest month (with the highest rainfall) is July (3.03").
The driest month (with the least rainfall) is September (1.61").

Average rainfall days in September
Fullerton, PA

Average rainfall days in September - Fullerton, PA
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (6.7 days).

Average snowfall in September
Fullerton, PA

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

The month with the highest snowfall is March (4.37").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Fullerton, PA

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

The month with the highest number of snowfall days is February (6.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Fullerton, PA
  • Average daylight in September: 12h and 3min

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 24min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).

Average sunshine days in September
Fullerton, PA

Average sunshine days in September - Fullerton, PA
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is January (20.5 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in September
Fullerton, PA

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

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

Average cloud cover in September
Fullerton, PA

Average cloud cover in September - Fullerton, PA
  • Average cloud cover in September: 39

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in September
Fullerton, PA

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

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

Fullerton, Pennsylvania, USA

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