1. United States
  2. Alaska
  3. Barter Island
  4. September

Barter Island, AK Climate in September

Temperature for September

In Barter Island, AK during September the average high temperature is 36.8°F. The hottest day on record was September 6, 1986 when the temperature recorded was 66.0°F.

Barter Island, AK daily average and extreme temperature range for September

Low Temperature

Overnight in September the average temperature drops below freezing at 29.5°F, with the lowest temperature of 3.9°F being recorded on September 25, 1975. On average there are 9 days in September when the temperature stays below freezing all day. In the worst September there were 23 days when the temperature did not make it above freezing. Overnight temperatures drop below freezing between 2 and 30 times in September.

Precipitation for September

In September the average monthly rainfall in Barter Island, AK is 0.24 inches with rain usually falling on between 9 and 10 days. 1949 was the driest September with only 0.00 inches of rain falling, and 1982 was the wettest September with 1.75 inches of rain. The wettest single day in September was 21 September 1982 when 0.75 inches of rain fell.

In September it usually snows on between 10 and 11 days. In September there have been some years when thunderstorms have occurred, although there are other years when there hasn't been a thunderstorm in September.

Show Year
Month Summary
JanuaryFebruaryMarchApril
MayJuneJulyAugust
SeptemberOctoberNovemberDecember