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%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
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.
Precipitation
Rainy days
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Chance of sun
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.
| 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 | ||||||||||