The highest day temperature in September 2023 was 69°F. The lowest night temperature was 46°F. The average values for day and night temperatures during September were 61.0°F и 52.6°F respectivly.

The average sea surface temperature in September 2023 for Whidbey Island was 58.2°F. The maximum and minimum values were 55.2°F and 60.6°F respectively.

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

Precipitation total in September for Whidbey Island is 1.0 in. It makes september one of the least rainy months of the year.

The average wind speed in September is 5.6 mph. It makes September one of the most windless months of the year for Whidbey Island.

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 Whidbey Island in September is 8.1 hours.