Weather in Boa Vista in September 2025
- September is usually the hottest month of the year in Boa Vista;
- September is usually the wettest month of the year in Boa Vista;
Average weather
Average temperature in Boa Vista in September
Going from a maximum of +86°F during the day to a minimum of +77°F during the night, the temperature in September averages around +84°F.
The average maximum temperature goes up 40% by the end of the month, compared with the beginning of the month, from +82°F to +86°F.
Is Boa Vista warm or cold in September?
Boa Vista is typically warm in September.
Maximum temperatures go up compared to the previous month from +81°F to +82°F. The minimum temperature also goes up from +75°F to +77°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is the hottest month in Boa Vista, here is the comparison with other months:
Climate in Boa Vista in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +81°F | +82°F | +81°F | ||||
| Min. temperature | ||||||
| +72°F | +73°F | +70°F | ||||
| Max. temperature | ||||||
| +86°F | +86°F | +88°F | ||||
| Rainfall | ||||||
| 28 mm | 40 mm | 15 mm | ||||
| Wind | ||||||
| 3 m/s | 4 m/s | 4 m/s | ||||
| Humidity | ||||||
| 79% | 80% | 78% | ||||
| Air pressure | ||||||
| 1012 HPa | 1012 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 4 | 5 | 8 | ||||
| Cloudy days | ||||||
| 19 | 16 | 19 | ||||
| Rainy days | ||||||
| 8 | 9 | 3 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting warmer as September arrives. The average maximum temperature goes up from +81°F to +82°F during the day. Prepare for more rain. Average rainfall goes from 28 mm to 40 mm. Humidity rises from 79% to 80%. Winds are stronger in comparison to August, going up from 3 m/s to 4 m/s on average. The good news is there are likely to be more sunny days in September, from 4 to 5.
October brings much the same weather, it remains good.
Wind
The average wind speed is 5 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Boa Vista is gradually increasing during September, going from 4 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Boa Vista?
Climate Change Over the Years
The climate in Boa Vista in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1986 (+75°F) and the highest in 2023 (+79°F). The driest year was 1992 with only 16 mm of rainfall, and the wettest year was 1999 with 229 mm.
FAQ
Is September a good time to visit Boa Vista?
Can you sunbathe in Boa Vista in September?
Is Boa Vista rainy in September?
Is it sunny in Boa Vista in September?
Monthly weather in Boa Vista
Source of the data
For this page, we’ve looked at the typical weather in Boa Vista, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.