September Weather in Juneau

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%.

0°C (33°F)

Minimum temperature

10°C (50°F)

Average temperature

19°C (67°F)

Maximum temperature

101%

Humidity

Precipitation and Sunshine hours

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.

259 mm (10.2 inches)

Precipitation

17 rainy days

Rainy days

5 hours 34 minutes

Sunshine hours

8%

Chance of sun

UV Index

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.

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 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

Compare Juneau's Climate with Cities Worldwide