The highest day temperature in September 2026 was 100°F. The lowest night temperature was 79°F. The average values for day and night temperatures during September were 89.8°F и 81.7°F respectivly.

The average sea surface temperature in September 2026 for Long Beach was 90.3°F. The maximum and minimum values were 87.0°F and 92.2°F respectively.

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

Precipitation total in September for Long Beach is 3.0 in. It makes september the most rainy month of the year.

The average wind speed in September is 7.2 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 Long Beach in September is 7.8 hours.