Climate averages 1991–2020
Oyem weather
in September.
A warm, very wet month: the 8th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Oyem: daytime highs average 27.5°C and nights cool to about 20.1°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 223 mm of rain on roughly 27 days, which makes September a very wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 07 min on an average September day.
The nearest other city in this atlas is Ciudad de la Paz (84 km away). In September its highs average 26.9°C, 0.6°C cooler than Oyem, with 266 mm of rain.
Among the 6 cities listed in Gabon, Oyem ranks 5th of 6 for the warmest September highs and 6th of 6 for the driest September (rainfall, lowest first). The mean September high of those 6 cities is 28.3°C; Oyem is 0.8°C cooler than that mean.
From September to October, average highs fall by 0.3°C to 27.2°C, and monthly rainfall rises from 223 mm to 261 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
Oyem climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.0°C20.3°C | 20.3°C | 84 | 16.4 | 12.012 h |
| February | 29.0°C20.5°C | 20.5°C | 113 | 17.2 | 12.112 h |
| March | 28.8°C20.6°C | 20.6°C | 200 | 25.4 | 12.112 h |
| April | 28.8°C20.7°C | 20.7°C | 226 | 26.4 | 12.112 h |
| May | 28.3°C20.6°C | 20.6°C | 185 | 26.9 | 12.212 h |
| June | 27.6°C20.2°C | 20.2°C | 143 | 22.7 | 12.212 h |
| July | 27.2°C19.8°C | 19.8°C | 119 | 20.4 | 12.212 h |
| August | 27.4°C20.0°C | 20.0°C | 117 | 20.6 | 12.212 h |
| September, selected | 27.5°C20.1°C | 20.1°C | 223 | 27.2 | 12.112 h |
| October | 27.2°C20.1°C | 20.1°C | 261 | 29.1 | 12.112 h |
| November | 27.4°C19.9°C | 19.9°C | 232 | 27.3 | 12.012 h |
| December | 28.3°C20.1°C | 20.1°C | 116 | 20.4 | 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
- Ciudad de la Paz in SeptemberEquatorial Guinea · 84 kmHigh 26.9°C · Low 20.1°C · 266 mm rain
- Ébolowa in SeptemberCameroon · 152 kmHigh 27.0°C · Low 20.5°C · 241 mm rain
- Sangmélima in SeptemberCameroon · 155 kmHigh 27.7°C · Low 20.2°C · 191 mm rain
- Bata in SeptemberEquatorial Guinea · 204 kmHigh 27.1°C · Low 22.9°C · 245 mm rain
- Mbalmayo in SeptemberCameroon · 213 kmHigh 26.9°C · Low 20.4°C · 166 mm rain
- Kribi in SeptemberCameroon · 238 kmHigh 26.2°C · Low 23.3°C · 335 mm rain
- Yaoundé in SeptemberCameroon · 252 kmHigh 26.4°C · Low 20.3°C · 184 mm rain
- Libreville in SeptemberGabon · 272 kmHigh 27.6°C · Low 23.4°C · 151 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 Oyem) is explained once on the Oyem year overview and on the Sources, method and limits page.