The highest day temperature in September 2026 was 58°F. The lowest night temperature was 39°F. The average values for day and night temperatures during September were 51.5°F и 47.1°F respectivly.

The average sea surface temperature in September 2026 for Wasilla was 44.3°F. The maximum and minimum values were 41.0°F and 46.2°F respectively.

Most of the days in September are gloomy but you can also expect sunny days.

Precipitation total in September for Wasilla is 1.4 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 3.5 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Wasilla in September is 3.8 hours.