Climate averages 1991–2020
Port-Gentil weather
in September.
A warm, fairly dry month: the 9th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Port-Gentil: daytime highs average 27.3°C and nights cool to about 23.6°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 34 mm of rain on roughly 9 days, which makes September a fairly dry month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 06 min on an average September day.
The nearest other city in this atlas is Owendo (138 km away). In September its highs average 28.3°C, 1.0°C warmer than Port-Gentil, with 123 mm of rain.
Among the 6 cities listed in Gabon, Port-Gentil ranks 6th of 6 for the warmest September highs and 1st of 6 for the driest September (rainfall, lowest first). The mean September high of those 6 cities is 28.3°C; Port-Gentil is 1.0°C cooler than that mean.
From September to October, average highs rise by 0.1°C to 27.4°C, and monthly rainfall rises from 34 mm to 147 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
Port-Gentil climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.5°C24.1°C | 24.1°C | 230 | 27.4 | 12.212 h |
| February | 28.9°C24.5°C | 24.5°C | 170 | 22.9 | 12.112 h |
| March | 29.3°C24.8°C | 24.8°C | 176 | 24.0 | 12.112 h |
| April | 29.1°C24.9°C | 24.9°C | 161 | 22.0 | 12.112 h |
| May | 28.4°C24.5°C | 24.5°C | 110 | 17.3 | 12.112 h |
| June | 27.0°C23.0°C | 23.0°C | 18 | 3.8 | 12.112 h |
| July | 26.5°C22.1°C | 22.1°C | 7.8 | 2.2 | 12.112 h |
| August | 26.8°C22.6°C | 22.6°C | 6.9 | 2.2 | 12.112 h |
| September, selected | 27.3°C23.6°C | 23.6°C | 34 | 8.6 | 12.112 h |
| October | 27.4°C24.0°C | 24.0°C | 147 | 23.2 | 12.112 h |
| November | 27.8°C23.8°C | 23.8°C | 275 | 28.0 | 12.112 h |
| December | 28.1°C23.9°C | 23.9°C | 262 | 28.4 | 12.212 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
- Owendo in SeptemberGabon · 138 kmHigh 28.3°C · Low 23.1°C · 123 mm rain
- Libreville in SeptemberGabon · 144 kmHigh 27.6°C · Low 23.4°C · 151 mm rain
- São Tomé in SeptemberSao Tome and Principe · 257 kmHigh 25.5°C · Low 23.8°C · 46 mm rain
- Bata in SeptemberEquatorial Guinea · 307 kmHigh 27.1°C · Low 22.9°C · 245 mm rain
- Ciudad de la Paz in SeptemberEquatorial Guinea · 343 kmHigh 26.9°C · Low 20.1°C · 266 mm rain
- Oyem in SeptemberGabon · 404 kmHigh 27.5°C · Low 20.1°C · 223 mm rain
- Kribi in SeptemberCameroon · 425 kmHigh 26.2°C · Low 23.3°C · 335 mm rain
- Ébolowa in SeptemberCameroon · 481 kmHigh 27.0°C · Low 20.5°C · 241 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 Port-Gentil) is explained once on the Port-Gentil year overview and on the Sources, method and limits page.