Climate averages 1991–2020
Atani weather
in September.
A hot, very wet month: the 10th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Atani: daytime highs average 28.8°C and nights cool to about 22.9°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 212 mm of rain on roughly 28 days, which makes September a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 09 min on an average September day.
The nearest other city in this atlas is Onitsha (16 km away). In September its highs average 28.7°C, about as warm as Atani, with 200 mm of rain.
Among the 143 cities listed in Nigeria, Atani ranks joint 40th of 143 for the warmest September highs and 72nd of 143 for the driest September (rainfall, lowest first). The mean September high of those 143 cities is 28.6°C; Atani is 0.1°C warmer than that mean.
From September to October, average highs rise by 0.7°C to 29.4°C, and monthly rainfall falls from 212 mm to 184 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
Atani climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 34.5°C23.5°C | 23.5°C | 8.4 | 2.1 | 11.812 h |
| February | 34.9°C24.6°C | 24.6°C | 19 | 4.4 | 11.912 h |
| March | 33.6°C24.8°C | 24.8°C | 67 | 12.6 | 12.112 h |
| April | 32.0°C24.5°C | 24.5°C | 130 | 19.0 | 12.212 h |
| May | 30.6°C24.0°C | 24.0°C | 174 | 25.2 | 12.412 h |
| June | 29.1°C23.3°C | 23.3°C | 209 | 26.7 | 12.512 h |
| July | 28.3°C22.7°C | 22.7°C | 197 | 26.6 | 12.412 h |
| August | 28.4°C22.7°C | 22.7°C | 188 | 24.2 | 12.312 h |
| September, selected | 28.8°C22.9°C | 22.9°C | 212 | 27.7 | 12.212 h |
| October | 29.4°C23.2°C | 23.2°C | 184 | 26.3 | 12.012 h |
| November | 30.9°C23.4°C | 23.4°C | 47 | 8.4 | 11.912 h |
| December | 33.2°C23.5°C | 23.5°C | 7.2 | 1.6 | 11.812 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
- Onitsha in SeptemberNigeria · 16 kmHigh 28.7°C · Low 23.0°C · 200 mm rain
- Nkpor in SeptemberNigeria · 18 kmHigh 28.4°C · Low 22.7°C · 200 mm rain
- Nnewi in SeptemberNigeria · 19 kmHigh 28.2°C · Low 22.3°C · 279 mm rain
- Asaba in SeptemberNigeria · 21 kmHigh 28.9°C · Low 23.2°C · 200 mm rain
- Ihiala in SeptemberNigeria · 21 kmHigh 28.1°C · Low 22.2°C · 282 mm rain
- Igbo-Ukwu in SeptemberNigeria · 30 kmHigh 27.1°C · Low 21.1°C · 279 mm rain
- Agulu in SeptemberNigeria · 36 kmHigh 28.3°C · Low 22.2°C · 279 mm rain
- Awka in SeptemberNigeria · 42 kmHigh 28.8°C · Low 22.8°C · 222 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 Atani) is explained once on the Atani year overview and on the Sources, method and limits page.