The highest day temperature in September 2025 was 85°F. The lowest night temperature was 77°F. The average values for day and night temperatures during September were 83.4°F и 77.8°F respectivly.

The average sea surface temperature in September 2025 for Libreville was 82.1°F. The maximum and minimum values were 80.4°F and 83.8°F respectively.

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

Precipitation total in September for Libreville is 3.2 in. It makes september one of the least rainy months of the year.

The average wind speed in September is 8.7 mph. It makes September one of the most windy months of the year for Libreville.

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 Libreville in September is 3.9 hours.