September Weather in Ketchikan

Last updated: March 2, 2024

The weather in Ketchikan, United States, during September is characterized by an average temperature of 12°C (55°F). Highs can soar to 17°C (63°F), while lows may dip to 9°C (48°F). Typically, the humidity level in Ketchikan throughout September hovers around 92%.

9°C (48°F)

Minimum temperature

12°C (55°F)

Average temperature

17°C (63°F)

Maximum temperature

92%

Humidity

Precipitation and Sunshine hours

In September, Ketchikan averages 302 mm (11.9 inches) of rainfall, typically over the course of 17 rainy days. The month enjoys an average of 12 hours 38 minutes of daylight, with the sun shining for approximately 6 hours 8 minutes each day. Additionally, there is a 10% probability of sunny days during this period.

302 mm (11.9 inches)

Precipitation

17 rainy days

Rainy days

6 hours 8 minutes

Sunshine hours

10%

Chance of sun

UV Index

In September, the UV Index in Ketchikan reaches a maximum of 5, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 30 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 2 3 4 5 5 5 4 2 1 1 1
Exposure Low Moderate Low
Time to burn 45 min 30 min 45 min

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