The highest day temperature in September 2025 was 84°F. The lowest night temperature was 77°F. The average values for day and night temperatures during September were 81.5°F и 79.6°F respectivly.

The average sea surface temperature in September 2025 for Boa Vista was 83.9°F. The maximum and minimum values were 82.4°F and 85.2°F respectively.

You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in September for Boa Vista is 1.5 in. It makes september the most rainy month of the year.

The average wind speed in September is 12.3 mph. It makes September one of the most windless months of the year for Boa Vista.

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 Boa Vista in September is 7.2 hours.