Erie
Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Erie, PA

The somber town of Erie, Pennsylvania, from above on a cool and sunny day, with a clear view of the dark and calm water of Lake Erie in the back
The somber town of Erie, Pennsylvania, from above on a cool and sunny day, with a clear view of the dark and calm water of Lake Erie in the back
The first month of the autumn, September, is still a pleasant month in Erie, Pennsylvania, with average temperature varying between 55.8°F (13.2°C) and 72°F (22.2°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 78.6°F (25.9°C) in August, to a pleasant 72°F (22.2°C). In September, in Erie, Pennsylvania, the average low-temperature is 55.8°F (13.2°C).

Humidity

In September, the average relative humidity in Erie is 74.5%.

Rainfall

September is the month with the most rainfall. Rain falls for 11.1 days and accumulates 4.6" (117.1mm) of precipitation.

Snowfall

In Erie snow does not fall in May through September.

Ocean temperature

In Erie, Pennsylvania, in September, the average water temperature is 70°F (21.1°C).
Note: For swimming, a surface water temperature of 70°F (21.1°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

In Erie, the average length of the day is 12.5h.

Sunshine

The average sunshine in Erie is 6h.

UV index

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in September in Erie?

In Erie, Pennsylvania, in September, the average high-temperature is 72°F (22.2°C), and the average low-temperature is 55.8°F (13.2°C).

What is the average humidity in September in Erie?

The average relative humidity in September is 74.5%.

How much does it rain in Erie in September?

In Erie, Pennsylvania, during September, the rain falls for 11.1 days and regularly aggregates up to 4.6" (117.1mm) of precipitation.

What is the wettest month in Erie?

The month with the most rainfall in Erie, Pennsylvania, is September when the rain falls for 11.1 days and typically aggregates up to 4.6" (117.1mm) of precipitation.

Does it snow in Erie in September?

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

When it does not snow in Erie?

May through September are months without snowfall in Erie.

What is the ocean temperature in September in Erie?

In Erie, the average seawater temperature in September is 70°F (21.1°C). For most, swimming in 70°F (21.1°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

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

In Erie, the average length of the day in September is 12.5h.

How many hours of sunshine does Erie have in September?

In Erie, Pennsylvania, the average sunshine in September is 6h.

How high is the UV index in September in Erie?

The average daily maximum UV index in September in Erie is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Erie, PA
  • Average high temperature in September: 71.9°F

The warmest month (with the highest average high temperature) is July (79.8°F).
The month with the lowest average high temperature is January (33.7°F).

  • Average low temperature in September: 55.8°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 (20.8°F).

Average humidity in September - Erie, PA
  • Average humidity in September: 74.5%

The month with the highest relative humidity is February (75.4%).
The month with the lowest relative humidity is April (67.9%).

Average rainfall in September - Erie, PA
  • Average rainfall in September: 4.6"

The wettest month (with the highest rainfall) is September (4.6").
The driest month (with the lowest rainfall) is February (2.4").

Average rainfall days in September - Erie, PA
  • Average rainfall days in September: 11.1 days

The month with the highest number of rainy days is January (19.6 days).
The month with the lowest number of rainy days is July (10.2 days).

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

The month with the highest snowfall is January (29.6").
Months with the lowest snowfall are May, June, July, August and September (0").

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

The month with the highest number of snowfall days is January (16.5 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average sea temperature in September - Erie, PA
  • Average sea temperature in September: 70°F

The best month for swimming (with the highest average sea temperature) is August (75.1°F).
The coldest month (with the lowest average sea temperature) is February (32.5°F).

Average daylight in September / Average sunshine in September - Erie, PA
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 6h

Months with most sunshine are June and July (Average sunshine: 9h).
The month with least sunshine is December (Average sunshine: 2h).

Average UV index in September - Erie, PA
  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 8).
Months with the lowest UV index are January and December (UV index 1).