September weather forecast
Emmaus, PA

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Weather in September

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

Temperature

The arrival of September is marked by a minor reduction in average high-temperature, sliding from a moderately hot 81°F (27.2°C) in August to a still warm 74.3°F (23.5°C). In the month of September, the nighttime temperature dips to a steady average of 55°F (12.8°C).

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

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

Daylight

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

Sunshine

The average sunshine in September in Emmaus is 8.7h.

UV index

In Emmaus, Pennsylvania, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: In September, the maximum UV index of 4 suggests these recommendations:
Exercise prevention - Warding off sunburn is urged. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Updated: Aug 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Emmaus in September?

The average high-temperature and low-temperature during September are 74.3°F (23.5°C) and 55°F (12.8°C) respectively. In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is appraised at 86°F (30°C).

What is the average humidity in September?

In September, the average relative humidity is 79%.

What is the driest month?

The month with the least rainfall in Emmaus is September, when the rain falls for 11.5 days and typically collects 1.61" (41mm) of precipitation.

How much does it rain in September?

In Emmaus, during September, the rain falls for 11.5 days and regularly aggregates up to 1.61" (41mm) of precipitation.

When it does not snow?

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

Does it snow in September?

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

What is the average length of the day in September?

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

What time are sunrise and sunset in September?

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

How long on average sun shines in September?

The average sunshine duration in September is 8.7h.

How high is the UV index in September?

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health threat 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
Emmaus, PA

Average temperature in September - Emmaus, 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
Emmaus, PA

Average pressure in September - Emmaus, 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
Emmaus, PA

Average wind speed in September - Emmaus, 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
Emmaus, PA

Average humidity in September - Emmaus, 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
Emmaus, PA

Average rainfall in September - Emmaus, 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
Emmaus, PA

Average rainfall days in September - Emmaus, 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
Emmaus, PA

Average snowfall in September - Emmaus, 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
Emmaus, PA

Average snowfall days in September - Emmaus, 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
Emmaus, PA

Average daylight in September / Average sunshine in September - Emmaus, 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 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
Emmaus, PA

Average sunshine days in September - Emmaus, 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
Emmaus, PA

Average UV index in September - Emmaus, 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
Emmaus, PA

Average cloud cover in September - Emmaus, 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
Emmaus, PA

Average visibility in September - Emmaus, 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).

Emmaus, Pennsylvania, USA

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