The highest day temperature in September 2026 was 73°F. The lowest night temperature was 48°F. The average values for day and night temperatures during September were 63.3°F и 53.9°F respectivly.

The average sea surface temperature in September 2026 for Astoria was 65.8°F. The maximum and minimum values were 61.6°F and 70.2°F respectively.

You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in September for Astoria is 0.9 in. It makes september one of the least rainy months of the year.

The average wind speed in September is 5.1 mph. It makes September one of the most windless months of the year for Astoria.

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 Astoria in September is 6.5 hours.