The highest day temperature in September 2026 was 88°F. The lowest night temperature was 84°F. The average values for day and night temperatures during September were 86.5°F и 85.6°F respectivly.

The average sea surface temperature in September 2026 for Roatan was 89.6°F. The maximum and minimum values were 88.6°F and 90.2°F respectively.

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

Precipitation total in September for Roatan is 5.0 in.

The average wind speed in September is 11.6 mph. It makes September one of the most windless months of the year for Roatan.

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 Roatan in September is 7.8 hours.