September Weather in South Portland

Last updated: March 2, 2024

The weather in South Portland, United States, during September is characterized by an average temperature of 17°C (63°F). Highs can soar to 24°C (76°F), while lows may dip to 10°C (50°F). Typically, the humidity level in South Portland throughout September hovers around 71%.

10°C (50°F)

Minimum temperature

17°C (63°F)

Average temperature

24°C (76°F)

Maximum temperature

71%

Humidity

Precipitation and Sunshine hours

In September, South Portland averages 77 mm (3.0 inches) of rainfall, typically over the course of 8 rainy days. The month enjoys an average of 12 hours 26 minutes of daylight, with the sun shining for approximately 9 hours 35 minutes each day. Additionally, there is a 43% probability of sunny days during this period.

77 mm (3.0 inches)

Precipitation

8 rainy days

Rainy days

9 hours 35 minutes

Sunshine hours

43%

Chance of sun

UV Index

In September, the UV Index in South Portland reaches a maximum of 7, indicating a level of High exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 25 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 1 1 3 5 6 7 7 6 5 3 2 1 1
Exposure Low Moderate High Moderate Low
Time to burn 45 min 30 min 25 min 30 min 45 min

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