The highest day temperature in September 2025 was 81°F. The lowest night temperature was 71°F. The average values for day and night temperatures during September were 75.8°F и 75.0°F respectivly.

The average sea surface temperature in September 2025 for Costa Calma was 76.3°F. The maximum and minimum values were 75.2°F and 77.0°F respectively.

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

Precipitation total in September for Costa Calma is 0.1 in. This value is relatively stable throughout the year.

The average wind speed in September is 12.7 mph.

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 Costa Calma in September is 10.0 hours.