September weather forecast
Irwin, PA

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Weather in September

September, the first month of the autumn in Irwin, is also a moderately hot month, with an average temperature varying between 55°F (12.8°C) and 75.4°F (24.1°C).

Temperature

Irwin's transition into September involves a gentle shift in temperature, receding from 81.5°F (27.5°C) in August to a still moderately hot 75.4°F (24.1°C). Irwin, in September, experiences an average temperature of 55°F (12.8°C) at night.

Humidity

In Irwin, the average relative humidity in September is 77%.

Rainfall

In Irwin, in September, during 12.8 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. Throughout the year, there are 161.9 rainfall days, and 19.29" (490mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:46 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:02 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 of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: In September, an average UV index of 4 transforms into the following instructions:
Adopt protective measures - Suggestions to resist sunburn are offered. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.

Frequently asked questions

What is the usual temperature for Irwin in September?

The high-temperature during September is 75.4°F (24.1°C) and the low-temperature is 55°F (12.8°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in August is estimated at 86°F (30°C).

What is the average humidity in September?

The average relative humidity in September is 77%.

How much does it rain in September?

In Irwin, in September, it is raining for 12.8 days, with typically 1.38" (35mm) of accumulated precipitation.

When it does not snow?

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

Does it snow in September?

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

How many hours of daylight does Irwin have in September?

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

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:46 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:02 pm EDT.

How many hours of sunshine does Irwin have in September?

The average sunshine duration in September is 8.7h.

What is the UV index reading in September in Irwin?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health risk 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
Irwin, PA

Average temperature in September - Irwin, PA
  • Average high temperature in September: 75.4°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (33.6°F).

  • Average low temperature in September: 55°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

Average pressure in September
Irwin, PA

Average pressure in September - Irwin, 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
Irwin, PA

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

The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

Average humidity in September
Irwin, PA

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

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April, July and August (76%).

Average rainfall in September
Irwin, PA

Average rainfall in September - Irwin, PA
  • Average rainfall in September: 1.38"

The wettest month (with the highest rainfall) is May (2.28").
The driest months (with the least rainfall) are January and November (1.14").

Average rainfall days in September
Irwin, PA

Average rainfall days in September - Irwin, PA
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (9.1 days).

Average snowfall in September
Irwin, PA

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

The month with the highest snowfall is January (2.13").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Irwin, PA

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

The month with the highest number of snowfall days is January (14.2 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
Irwin, PA

Average daylight in September / Average sunshine in September - Irwin, 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 24min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in September
Irwin, PA

Average sunshine days in September - Irwin, PA
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is November (17 days).
The month with the least sunshine days is February (9 days).

Average UV index in September
Irwin, PA

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

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

Average cloud cover in September
Irwin, PA

Average cloud cover in September - Irwin, PA
  • Average cloud cover in September: 37

The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 32).

Average visibility in September
Irwin, PA

Average visibility in September - Irwin, 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).

Irwin, Pennsylvania, USA

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