Climate averages 1991–2020
Brazzaville weather
in September.
A hot, fairly dry month: the warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Brazzaville: daytime highs average 31.2°C and nights cool to about 21.7°C. By daytime temperature it is the warmest month of the year.
Expect about 16 mm of rain on roughly 5 days, which makes September a fairly dry month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 05 min on an average September day.
The nearest other city in this atlas is Kinshasa (8 km away). In September its highs average 31.2°C, about as warm as Brazzaville, with 16 mm of rain.
Among the 4 cities listed in the Republic of the Congo, Brazzaville ranks 1st of 4 for the warmest September highs and 3rd of 4 for the driest September (rainfall, lowest first). The mean September high of those 4 cities is 28.8°C; Brazzaville is 2.4°C warmer than that mean.
From September to October, average highs fall by 0.8°C to 30.4°C, and monthly rainfall rises from 16 mm to 112 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
Brazzaville climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.3°C22.5°C | 22.5°C | 116 | 20.9 | 12.312 h |
| February | 30.0°C22.8°C | 22.8°C | 103 | 15.8 | 12.212 h |
| March | 30.3°C23.0°C | 23.0°C | 109 | 17.9 | 12.112 h |
| April | 29.8°C23.0°C | 23.0°C | 140 | 21.2 | 12.012 h |
| May | 29.6°C22.6°C | 22.6°C | 73 | 14.5 | 11.912 h |
| June | 29.6°C20.7°C | 20.7°C | 4.0 | 1.2 | 11.912 h |
| July | 29.9°C19.8°C | 19.8°C | 0.6 | 0.2 | 11.912 h |
| August | 30.1°C20.4°C | 20.4°C | 4.7 | 1.0 | 12.012 h |
| September, selected | 31.2°C21.7°C | 21.7°C | 16 | 5.0 | 12.112 h |
| October | 30.4°C22.5°C | 22.5°C | 112 | 18.7 | 12.212 h |
| November | 29.0°C22.3°C | 22.3°C | 183 | 25.0 | 12.312 h |
| December | 28.9°C22.3°C | 22.3°C | 156 | 24.9 | 12.412 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
- Kinshasa in SeptemberDemocratic Republic of the Congo · 8 kmHigh 31.2°C · Low 21.7°C · 16 mm rain
- Masina in SeptemberDemocratic Republic of the Congo · 18 kmHigh 31.4°C · Low 21.7°C · 19 mm rain
- Inkisi in SeptemberDemocratic Republic of the Congo · 99 kmHigh 29.7°C · Low 20.4°C · 21 mm rain
- Mbanza-Ngungu in SeptemberDemocratic Republic of the Congo · 120 kmHigh 27.9°C · Low 18.5°C · 18 mm rain
- Kimpese in SeptemberDemocratic Republic of the Congo · 172 kmHigh 29.3°C · Low 20.4°C · 11 mm rain
- Nkayi in SeptemberRepublic of the Congo · 222 kmHigh 29.8°C · Low 21.4°C · 11 mm rain
- Mbanza Kongo in SeptemberAngola · 251 kmHigh 27.9°C · Low 18.9°C · 11 mm rain
- Bandundu Province in SeptemberDemocratic Republic of the Congo · 256 kmHigh 31.6°C · Low 22.9°C · 99 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 Brazzaville) is explained once on the Brazzaville year overview and on the Sources, method and limits page.
Kinshasa lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures come from the same 0.1° cell and differ only by the elevation adjustment.