Erie
Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Erie, PA

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  • The 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).

  • The 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).

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  • The 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%).

  • The 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").

  • The 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).

  • The 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").

  • The 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).

  • The average sea temperature in September: 66°F

The best month for swimming (with the highest average sea temperature) is August (72°F).
Coldest months (with the lowest average sea temperature) are February and March (36°F).

  • The average daylight in September: 12h

Months with the longest days are May, June and July (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9h).

  • The 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).

  • The 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).

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