Climate averages 1991–2020
Boa Vista weather
in September.
A hot, wet month: the 8th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Boa Vista: daytime highs average 30.8°C and nights cool to about 23.2°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 94 mm of rain on roughly 15 days, which makes September a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 08 min on an average September day.
The nearest other city in this atlas is Georgetown (524 km away). In September its highs average 29.1°C, 1.6°C cooler than Boa Vista, with 96 mm of rain.
Among the 448 cities listed in Brazil, Boa Vista ranks joint 101st of 448 for the warmest September highs and joint 338th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Boa Vista is 3.2°C warmer than that mean.
From September to October, average highs rise by 1.1°C to 31.8°C, and monthly rainfall falls from 94 mm to 71 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Boa Vista climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 32.1°C24.1°C | 24.1°C | 34 | 6.7 | 12.012 h |
| February | 32.5°C24.3°C | 24.3°C | 31 | 5.8 | 12.012 h |
| March | 33.0°C24.6°C | 24.6°C | 59 | 9.1 | 12.112 h |
| April | 31.1°C24.0°C | 24.0°C | 200 | 17.4 | 12.212 h |
| May | 28.8°C23.2°C | 23.2°C | 343 | 26.4 | 12.212 h |
| June | 28.3°C22.7°C | 22.7°C | 310 | 27.3 | 12.312 h |
| July | 28.3°C22.4°C | 22.4°C | 249 | 26.7 | 12.312 h |
| August | 29.3°C22.7°C | 22.7°C | 156 | 22.2 | 12.212 h |
| September, selected | 30.8°C23.2°C | 23.2°C | 94 | 15.4 | 12.112 h |
| October | 31.8°C23.8°C | 23.8°C | 71 | 12.8 | 12.112 h |
| November | 31.6°C24.0°C | 24.0°C | 90 | 13.6 | 12.012 h |
| December | 31.5°C24.1°C | 24.1°C | 58 | 10.3 | 12.012 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Georgetown in SeptemberGuyana · 524 kmHigh 29.1°C · Low 25.5°C · 96 mm rain
- Upata in SeptemberVenezuela · 609 kmHigh 31.1°C · Low 22.2°C · 103 mm rain
- Ciudad Guayana in SeptemberVenezuela · 652 kmHigh 31.3°C · Low 23.3°C · 112 mm rain
- Manaus in SeptemberBrazil · 662 kmHigh 31.2°C · Low 24.6°C · 121 mm rain
- Ciudad Bolívar in SeptemberVenezuela · 670 kmHigh 31.2°C · Low 23.7°C · 138 mm rain
- Manacapuru in SeptemberBrazil · 680 kmHigh 30.5°C · Low 25.0°C · 138 mm rain
- Paramaribo in SeptemberSuriname · 698 kmHigh 31.0°C · Low 24.2°C · 66 mm rain
- Itacoatiara in SeptemberBrazil · 708 kmHigh 31.2°C · Low 25.2°C · 109 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Boa Vista) is explained once on the Boa Vista year overview and on the Sources, method and limits page.