Last updated: March 2, 2024
The weather in Unalaska, United States, during September is characterized by an average temperature of 9°C (48°F). Highs can soar to 14°C (57°F), while lows may dip to 3°C (38°F). Typically, the humidity level in Unalaska throughout September hovers around 86%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Unalaska averages 117 mm (4.6 inches) of rainfall, typically over the course of 17 rainy days. The month enjoys an average of 12 hours 35 minutes of daylight, with the sun shining for approximately 6 hours 23 minutes each day. Additionally, there is a 19% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Unalaska reaches a maximum of 5, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 14:00 and 16:00, 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 | 0 | 0 | 1 | 1 | 2 | 3 | 4 | 5 | 5 | 4 | 4 | 3 | 2 |
| Exposure | Low | Moderate | Low | ||||||||||
| Time to burn | 45 min | 30 min | 45 min | ||||||||||