September weather - Autumn 2024

Weather in September
Frequently asked questions
Average temperature in September
Average pressure in September
Average wind speed in September
Average humidity in September
Average rainfall in September
Average rainfall days in September
Average snowfall in September
Average snowfall days in September
Average daylight in September
Average sunshine in September
Average sunshine days in September
Average UV index in September
Average cloud cover in September
Average visibility in September

The iconic and unifying Pennsylvania monument in a vast green field with neat grounds and green trees in the city of Gettysburg, Pennsylvania

Weather in September

The arrival of September marks the transition from summer to fall in Gettysburg, heralding a consistent drop in temperatures. The weather still feels predominantly warm, but rainfall becomes less frequent, decreasing to 0.75" (19mm) over the month. Daylight hours continue to decline while the number of sunshine hours start to taper off too. Wind speeds take an upward swing as the effects of the fall season begin to show. Despite the subtle changes, September maintains a fair balance between the summer heat and incoming autumn chills.

Temperature

September indicates a minor shift in the average high-temperature, from August's 81.3°F (27.4°C) to a still moderately hot 74.8°F (23.8°C). In September, Gettysburg encounters an average low-temperature of 56.3°F (13.5°C) during the night.

Humidity

In September, the average relative humidity in Gettysburg, Pennsylvania, is 79%.

Rainfall

In Gettysburg, during September, the rain falls for 10.5 days and regularly aggregates up to 0.75" (19mm) of precipitation. In Gettysburg, Pennsylvania, during the entire year, the rain falls for 125 days and collects up to 12.13" (308mm) of precipitation.

Snowfall

In Gettysburg, snow does not fall in May through September.

Daylight

The average length of the day in September in Gettysburg is 12h and 26min.
On the first day of September in Gettysburg, sunrise is at 6:37 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

Sunshine

The average sunshine in September in Gettysburg is 8.9h.

UV index

In Gettysburg, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Take measures. Individuals with light skin might experience burns in under 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.

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Frequently asked questions

What are September temperatures in Gettysburg?

In September, the average high-temperature and low-temperature in Gettysburg, Pennsylvania, are 74.8°F (23.8°C) and 56.3°F (13.5°C) respectively. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, in August is evaluated at 86°F (30°C).

What is the average humidity in September in Gettysburg?

In Gettysburg, Pennsylvania, the average relative humidity in September is 79%.

How much does it rain in Gettysburg in September?

In Gettysburg, Pennsylvania, during September, the rain falls for 10.5 days and regularly aggregates up to 0.75" (19mm) of precipitation.

When it does not snow in Gettysburg?

May through September are months without snowfall.

Does it snow in Gettysburg in September?

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

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

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

When are sunrise and sunset in September in Gettysburg?

In September, on the first day of the month, sunrise is at 6:37 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

How long on average sun shines in September in Gettysburg?

In September, the average sunshine duration in Gettysburg, Pennsylvania, is 8.9h.

What is the UV index reading in September in Gettysburg?

In Gettysburg, Pennsylvania, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

81.3°F 27.4°C

74.8°F 23.8°C

63.1°F 17.3°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

5.3mph 8.5km/h

5.7mph 9.2km/h

7.3mph 11.7km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

13.6

16.3

19.4

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Gettysburg, PA

Average high temperature in September: 74.8°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (35.6°F).

Average low temperature in September: 56.3°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

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Average pressure in September
Gettysburg, PA

Average pressure in September: 30.06"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
Gettysburg, PA

Average wind speed in September: 5.4mph

The windiest months (with the highest average wind speed) are January, February and March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in September
Gettysburg, PA

Average humidity in September: 79%

The month with the highest relative humidity is May (80%).
The months with the lowest relative humidity are April and July (75%).

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Average rainfall in September
Gettysburg, PA

Average rainfall in September: 0.75"

The wettest month (with the highest rainfall) is July (1.46").
The driest months (with the least rainfall) are January and February (0.71").

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Average rainfall days in September
Gettysburg, PA

Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (5 days).

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Average snowfall in September
Gettysburg, PA

Average snowfall in September: 0"

The month with the highest snowfall is March (1.3").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Gettysburg, PA

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (6.4 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
Gettysburg, PA

Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in September
Gettysburg, PA

Average sunshine days in September: 16.3 days

The month with the most sunshine days is November (21.6 days).
The month with the least sunshine days is August (13.6 days).

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Average UV index in September
Gettysburg, PA

Average UV index in September: 4

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

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Average cloud cover in September
Gettysburg, PA

Average cloud cover in September: 38

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in September
Gettysburg, PA

Average visibility in September: 5mi

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

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September weather forecast
Gettysburg, PA

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