Brazzaville weather in September
In September, Brazzaville has an average high of 32 °C89 °F and an average low of 22 °C72 °F, with about 57 mm2.2 in of precipitation. September is the warmest month of the year and ranks 9th for precipitation.
How September compares with other months
Compared with August, September is 1.2 °C2.2 °F warmer on average and wetter by 44 mm1.7 in. Compared with October, September is about the same temperature and drier by 119 mm4.7 in. Daylight lasts about 12.1 hours around the middle of the month. Average relative humidity is 72% and the average cloud amount 61%.
Is September a good time to visit Brazzaville?
September is not among the most comfortable months by our comfort score: it is hot (average high 32 °C89 °F). The most comfortable months in Brazzaville are June–August.
What to wear in September
For Brazzaville in September, pack very light, breathable clothing, a sun hat and plenty of water.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Brazzaville | 3289 | 2272 | 572.2 |
| Kinshasa | 3289 | 2373 | 783.1 |
| Inkisi | 3187 | 2069 | 522.1 |
| Mbanza-Ngungu | 3087 | 1966 | 512.0 |
| Nkayi | 3392 | 2170 | 351.4 |
| Mbanza Kongo | 3290 | 1967 | 341.4 |
| Bandundu Province | 3189 | 2374 | 1184.7 |
| Matadi | 3392 | 2169 | 240.9 |
| Dolisie | 3289 | 2067 | 281.1 |
Nearby places that are more than 1 °C1.8 °F cooler: Inkisi, Mbanza-Ngungu, Mbanza Kongo and Dolisie.
Other months in Brazzaville
- January30 °C86 °F / 22 °C72 °F
- February30 °C86 °F / 23 °C73 °F
- March30 °C86 °F / 23 °C73 °F
- April30 °C86 °F / 23 °C73 °F
- May30 °C86 °F / 22 °C72 °F
- June30 °C86 °F / 20 °C68 °F
- July30 °C86 °F / 19 °C67 °F
- August31 °C88 °F / 20 °C69 °F
- September32 °C89 °F / 22 °C72 °F
- October31 °C87 °F / 23 °C73 °F
- November29 °C85 °F / 23 °C73 °F
- December29 °C85 °F / 22 °C72 °F
Frequently asked questions
How warm is Brazzaville in September?
In September the average high in Brazzaville is 32 °C (89 °F) and the average low is 22 °C (72 °F).
Does it rain a lot in Brazzaville in September?
On average about 57 mm (2.2 in) of precipitation falls in September; it ranks 9th of the 12 months.
Is September the warmest month in Brazzaville?
Yes. September is the warmest month in Brazzaville. The coldest month is July, with an average low of 19 °C (67 °F).
How long is the day in Brazzaville in September?
In the middle of September the day in Brazzaville lasts about 12.1 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Brazzaville in September?
The average relative humidity in September is about 72%. Combined with warm days, it can feel muggy.
How cloudy is Brazzaville in September?
On average about 61% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 438 m, while Brazzaville lies at about 284 m. Temperatures on this page were therefore adjusted by +1 °C1.8 °F using the standard lapse rate of 6.5 °C per 1,000 m.