Last updated: March 2, 2024
The weather in Juneau, United States, during September is characterized by an average temperature of 10°C (50°F). Highs can soar to 19°C (67°F), while lows may dip to 0°C (33°F). Typically, the humidity level in Juneau throughout September hovers around 101%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Juneau averages 259 mm (10.2 inches) of rainfall, typically over the course of 17 rainy days. The month enjoys an average of 12 hours 42 minutes of daylight, with the sun shining for approximately 5 hours 34 minutes each day. Additionally, there is a 8% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Juneau reaches a maximum of 6, 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.
| 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 | 4 | 5 | 6 | 6 | 6 | 4 | 3 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | Moderate | Low | ||||||||
| Time to burn | 45 min | 30 min | 25 min | 30 min | 45 min | ||||||||