The highest day temperature in September 2026 was 85°F. The lowest night temperature was 69°F. The average values for day and night temperatures during September were 83.3°F и 74.1°F respectivly.

The average sea surface temperature in September 2026 for Ilheus was 82.3°F. The maximum and minimum values were 81.6°F and 83.2°F respectively.

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

Precipitation total in September for Ilheus is 1.3 in. It makes september the least rainy month of the year.

The average wind speed in September is 6.6 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 Ilheus in September is 5.4 hours.