September weather forecast
Heidelberg, PA

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Weather in September

September, the first month of the autumn in Heidelberg, is still a warm month, with an average temperature ranging between min 55.8°F (13.2°C) and max 75.7°F (24.3°C).

Temperature

September signals a slight drop in average high-temperature, sliding from August's 82.4°F (28°C) to a still moderately hot 75.7°F (24.3°C). During the month of September, an average temperature of 55.8°F (13.2°C) is noted during the nights.

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Heidelberg, in September, during 10.6 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, there are 132.6 rainfall days, and 11.5" (292mm) of precipitation is accumulated.

Snowfall

In Heidelberg, snow does not fall in May through October.

Daylight

In September, the average length of the day is 12h and 27min.
On the first day of the month, sunrise is at 6:48 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:16 am and sunset at 7:03 pm EDT.

Sunshine

The average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: A daily high UV index of 4 in September leads to these guidelines:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.

Frequently asked questions

What is the average September temperature?

The average high-temperature and low-temperature during September are 75.7°F (24.3°C) and 55.8°F (13.2°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is appraised at 87.8°F (31°C).

What is the average humidity in September?

In September, the average relative humidity is 77%.

How many days does it rain in September?

In Heidelberg, during September, the rain falls for 10.6 days and regularly aggregates up to 0.79" (20mm) of precipitation.

When it does not snow?

May through October are months without snowfall in Heidelberg.

How many hours of daylight does Heidelberg have in September?

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

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:48 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.

How long on average sun shines in September?

The average sunshine duration in September is 8.5h.

How high is the UV index in September?

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's 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
Heidelberg, PA

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

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in September: 55.8°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).

Average pressure in September
Heidelberg, PA

Average pressure in September - Heidelberg, 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
Heidelberg, PA

Average wind speed in September - Heidelberg, PA
  • Average wind speed in September: 5.1mph

The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

Average humidity in September
Heidelberg, PA

Average humidity in September - Heidelberg, PA
  • Average humidity in September: 77%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (75%).

Average rainfall in September
Heidelberg, PA

Average rainfall in September - Heidelberg, PA
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is July (1.34").
The driest month (with the least rainfall) is November (0.67").

Average rainfall days in September
Heidelberg, PA

Average rainfall days in September - Heidelberg, PA
  • Average rainfall days in September: 10.6 days

The month with the highest number of rainy days is July (15.6 days).
The month with the least rainy days is February (6.4 days).

Average snowfall in September
Heidelberg, PA

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

The month with the highest snowfall is February (0.98").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Heidelberg, PA

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

The month with the highest number of snowfall days is January (9.3 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
Heidelberg, PA

Average daylight in September / Average sunshine in September - Heidelberg, 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 3min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in September
Heidelberg, PA

Average sunshine days in September - Heidelberg, PA
  • Average sunshine days in September: 16.4 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (12.2 days).

Average UV index in September
Heidelberg, PA

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

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

Average cloud cover in September
Heidelberg, PA

Average cloud cover in September - Heidelberg, 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).

Average visibility in September
Heidelberg, PA

Average visibility in September - Heidelberg, 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).

Heidelberg, Pennsylvania, USA

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