September weather forecast
Slippery Rock, PA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Slippery Rock, Pennsylvania, with temperature in the range of an average high of 73.4°F (23°C) and an average low of 53.6°F (12°C).

Temperature

September's arrival aligns with a minor decrease in average high-temperatures, from August's moderately hot 79.7°F (26.5°C) to a still warm 73.4°F (23°C). Slippery Rock sees an average low-temperature of 53.6°F (12°C) during September.

Humidity

In Slippery Rock, the average relative humidity in September is 81%.

Rainfall

In September, in Slippery Rock, the rain falls for 15.8 days. Throughout September, 2.68" (68mm) of precipitation is accumulated. In Slippery Rock, during the entire year, the rain falls for 177.8 days and collects up to 36.65" (931mm) of precipitation.

Snowfall

In Slippery Rock, snow does not fall in June through September.

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of the month, sunrise is at 6:47 am and sunset at 7:52 pm. On the last day of September, sunrise is at 7:16 am and sunset at 7:03 pm EDT.

Sunshine

In Slippery Rock, the average sunshine in September is 8h.

UV index

In Slippery Rock, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 in September transforms into the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
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Frequently asked questions

What are the temperatures in Slippery Rock in September?

The average high-temperature, in September, in Slippery Rock, is 73.4°F (23°C), while the average low-temperature is 53.6°F (12°C). The average heat index (a.k.a. 'real feel', 'feels like'), which combines relative humidity and air temperature, in July is computed to be 86°F (30°C).

What is the average humidity in September in Slippery Rock?

In September, the average relative humidity in Slippery Rock, Pennsylvania, is 81%.

How many days does it rain in September in Slippery Rock?

In Slippery Rock, Pennsylvania, during September, the rain falls for 15.8 days and regularly aggregates up to 2.68" (68mm) of precipitation.

When it does not snow in Slippery Rock?

June through September are months without snowfall in Slippery Rock, Pennsylvania.

Does it snow in Slippery Rock in September?

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

What is the average length of the day in September in Slippery Rock?

The average day length in September in Slippery Rock, Pennsylvania, is 12h and 28min.

When are sunrise and sunset in September in Slippery Rock?

On the first day of September in Slippery Rock, Pennsylvania, sunrise is at 6:47 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:03 pm EDT.

How many hours of sunshine does Slippery Rock have in September?

In September, the average sunshine duration in Slippery Rock is 8h.

What is the UV index reading in September in Slippery Rock?

In September, the average daily maximum UV index in Slippery Rock, Pennsylvania, is 3. A UV Index of 3 to 5 symbolizes 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
Slippery Rock, PA

Average temperature in September - Slippery Rock, PA
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.3°F).

  • Average low temperature in September: 53.6°F

The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is January (18.1°F).

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Average pressure in September
Slippery Rock, PA

Average pressure in September - Slippery Rock, PA
  • Average pressure in September: 30.05"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).

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Average wind speed in September
Slippery Rock, PA

Average wind speed in September - Slippery Rock, PA
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).

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Average humidity in September
Slippery Rock, PA

Average humidity in September - Slippery Rock, PA
  • Average humidity in September: 81%

The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are April, May, June, July and August (79%).

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Average rainfall in September
Slippery Rock, PA

Average rainfall in September - Slippery Rock, PA
  • Average rainfall in September: 2.68"

The wettest month (with the highest rainfall) is April (3.74").
The driest month (with the least rainfall) is November (2.36").

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Average rainfall days in September
Slippery Rock, PA

Average rainfall days in September - Slippery Rock, PA
  • Average rainfall days in September: 15.8 days

The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (8.1 days).

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Average snowfall in September
Slippery Rock, PA

Average snowfall in September - Slippery Rock, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (8.54").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Slippery Rock, PA

Average snowfall days in September - Slippery Rock, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (19.1 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
Slippery Rock, PA

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

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 0min

The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).

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Average sunshine days in September
Slippery Rock, PA

Average sunshine days in September - Slippery Rock, PA
  • Average sunshine days in September: 12.5 days

The month with the most sunshine days is November (13.1 days).
The month with the least sunshine days is February (6.3 days).

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Average UV index in September
Slippery Rock, PA

Average UV index in September - Slippery Rock, PA
  • Average UV index in September: 3

The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in September
Slippery Rock, PA

Average cloud cover in September - Slippery Rock, PA
  • Average cloud cover in September: 43

The month with the most cloud cover is January (Cloud cover 76).
The month with the least cloud cover is August (Cloud cover 38).

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Average visibility in September
Slippery Rock, PA

Average visibility in September - Slippery Rock, PA
  • Average visibility in September: 5mi

The months with the highest visibility are March, April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February and December (4mi).

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Slippery Rock, Pennsylvania, USA

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