September weather forecastErie, PA
September
Weather in September
September in Erie, Pennsylvania, transitions from the warmth of late summer to the crisp nip of early fall. Trailing the scorching summer, it delivers milder and comfortable weather for residents. Falling to 58.8°F (14.9°C) on cooler days, the city witnesses a welcome change in temperatures. October ushers in a pronounced onset of autumn weather, often bringing chillier conditions. As a precursor to the vibrant hues of autumn, September opens the doors for heartwarming fall activities and events.Temperature
August's transformation into September witnesses an average high-temperature of an agreeable 69.6°F (20.9°C), noting a minor change from the preceding month. In the month of September, an average of 58.8°F (14.9°C) marks the low-temperature.Humidity
August through November, with an average relative humidity of 78%, are the least humid months.Rainfall
The month with the least rainfall in Erie, Pennsylvania, is September, when the rain falls for 7.9 days and typically collects 0.35" (9mm) of precipitation.Snowfall
In Erie, snow does not fall in June through October.Ocean temperature
In September, the average ocean temperature in Erie is 70°F (21.1°C).Note: In 70°F (21.1°C), swimming is not an enjoyable activity for most. The challenge of managing one's breathing increases as the temperature goes under 69.8°F (21°C).
Daylight
The average length of the day in September is 12h and 28min.On the first day of September in Erie, sunrise is at 6:46 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 7:03 pm EDT.
Sunshine
In Erie, the average sunshine in September is 8.8h.UV index
In Erie, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 4 during September leads to these advisories:
Put precautions into practice - Protective measures against sun-induced damage are advised. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Caution! The reflection of sand and water significantly amplifies the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Erie, PA
- Average high temperature in September: 69.6°F
The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in September: 58.8°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in September
Erie, PA
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Erie, PA
- Average wind speed in September: 9.4mph
The windiest month (with the highest average wind speed) is January (13.5mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in September
Erie, PA
- Average humidity in September: 78%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are August, September, October and November (78%).
Average rainfall in September
Erie, PA
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is October (0.83").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in September
Erie, PA
- Average rainfall days in September: 7.9 days
The month with the highest number of rainy days is August (11.7 days).
The month with the least rainy days is January (4 days).
Average snowfall in September
Erie, PA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.71").
The months with the least snowfall are June, July, August, September and October (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 (7.8 days).
The months with the least snowfall days are June, July, August, September and October (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: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in September
Erie, PA
- Average sunshine days in September: 19.6 days
The month with the most sunshine days is March (21.3 days).
The month with the least sunshine days is August (16.3 days).
Average UV index in September
Erie, PA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Erie, PA
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 76).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in September
Erie, PA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
