Gustavus
Alaska, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Gustavus, AK

Brown sand and water on a section of the Gustavus Beach, Alaska, and snow-peaked mountains in the far view
Brown sand and water on a section of the Gustavus Beach, Alaska, and snow-peaked mountains in the far view
September, the first month of the autumn, in Gustavus, is still a mild month, with average temperature fluctuating between 41.9°F (5.5°C) and 57°F (13.9°C).

Temperature

In September, the average high-temperature slightly decreases, from an enjoyable 63°F (17.2°C) in August, to a mild 57°F (13.9°C). In September, the average low-temperature is 41.9°F (5.5°C).

Rainfall

In Gustavus, during 21 rainfall days, 7.2" (183.1mm) of precipitation is typically accumulated. Throughout the year, there are 217 rainfall days, and 55.7" (1415.3mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Gustavus.

Daylight

In Gustavus, the average length of the day in September is 12.8h.

What is the temperature in September in Gustavus?

In September, the average high-temperature is 57°F (13.9°C), and the average low-temperature is 41.9°F (5.5°C).

How many days does it rain in September in Gustavus?

In Gustavus, Alaska, in September, it is raining for 21 days, with typically 7.2" (183.1mm) of accumulated precipitation.

Does it snow in Gustavus in September?

In Gustavus, Alaska, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Gustavus?

In Gustavus, Alaska, snow does not fall in June through September.

What is the average length of the day in September in Gustavus?

In Gustavus, Alaska, the average length of the day in September is 12.8h.
Average temperature in September - Gustavus, AK
  • Average high temperature in September: 57°F

The warmest month (with the highest average high temperature) is July (63.4°F).
The month with the lowest average high temperature is January (30.4°F).

  • Average low temperature in September: 41.9°F

The month with the highest average low temperature is July (48.1°F).
The coldest month (with the lowest average low temperature) is January (19°F).

Average rainfall in September - Gustavus, AK
  • Average rainfall in September: 7.2"

The wettest month (with the highest rainfall) is October (8.6").
The driest month (with the lowest rainfall) is April (2.5").

Average rainfall days in September - Gustavus, AK
  • Average rainfall days in September: 21 days

The month with the highest number of rainy days is October (24 days).
The month with the lowest number of rainy days is June (15 days).

Average snowfall in September - Gustavus, AK
  • Average snowfall in September: 0"

The month with the highest snowfall is January (19.7").
Months with the lowest snowfall are June, July, August and September (0").

Average daylight in September - Gustavus, AK
  • Average daylight in September: 12.8h

The month with the longest days is June (Average daylight: 18.2h).
The month with shortest days is December (Average daylight: 6.5h).