Climate averages 1991–2020
Niamey weather
in September.
A very hot, moderately wet month: the 9th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a very hot month in Niamey: daytime highs average 34.5°C and nights cool to about 24.7°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 45 mm of rain on roughly 7 days, which makes September a moderately wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 13 min on an average September day.
The nearest other city in this atlas is Dosso (128 km away). In September its highs average 33.3°C, 1.3°C cooler than Niamey, with 58 mm of rain.
Among the 8 cities listed in Niger, Niamey ranks joint 4th of 8 for the warmest September highs and 5th of 8 for the driest September (rainfall, lowest first). The mean September high of those 8 cities is 35.6°C; Niamey is 1.1°C cooler than that mean.
From September to October, average highs rise by 2.9°C to 37.4°C, and monthly rainfall falls from 45 mm to 8.8 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
Niamey climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.6°C15.8°C | 15.8°C | 0 | 0.0 | 11.411 h |
| February | 34.7°C18.0°C | 18.0°C | 0.1 | 0.0 | 11.712 h |
| March | 38.4°C21.3°C | 21.3°C | 1.0 | 0.4 | 12.012 h |
| April | 40.8°C25.1°C | 25.1°C | 1.9 | 0.6 | 12.412 h |
| May | 40.5°C27.9°C | 27.9°C | 8.3 | 2.3 | 12.713 h |
| June | 38.3°C27.3°C | 27.3°C | 21 | 5.1 | 12.913 h |
| July | 34.8°C25.4°C | 25.4°C | 61 | 10.7 | 12.813 h |
| August | 32.2°C24.1°C | 24.1°C | 122 | 15.2 | 12.613 h |
| September, selected | 34.5°C24.7°C | 24.7°C | 45 | 6.5 | 12.212 h |
| October | 37.4°C24.2°C | 24.2°C | 8.8 | 1.9 | 11.812 h |
| November | 36.0°C19.2°C | 19.2°C | 0 | 0.0 | 11.512 h |
| December | 32.7°C16.5°C | 16.5°C | 0 | 0.0 | 11.311 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
- Dosso in SeptemberNiger · 128 kmHigh 33.3°C · Low 24.2°C · 58 mm rain
- Fada N'gourma in SeptemberBurkina Faso · 249 kmHigh 30.8°C · Low 22.8°C · 105 mm rain
- Birnin Kebbi in SeptemberNigeria · 255 kmHigh 32.2°C · Low 24.0°C · 77 mm rain
- Jega in SeptemberNigeria · 285 kmHigh 31.5°C · Low 23.8°C · 96 mm rain
- Pouytenga in SeptemberBurkina Faso · 309 kmHigh 31.4°C · Low 22.9°C · 98 mm rain
- Birni N Konni in SeptemberNiger · 341 kmHigh 34.4°C · Low 24.7°C · 47 mm rain
- Sokoto in SeptemberNigeria · 343 kmHigh 32.6°C · Low 24.1°C · 68 mm rain
- Kaya in SeptemberBurkina Faso · 349 kmHigh 32.3°C · Low 23.1°C · 80 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 Niamey) is explained once on the Niamey year overview and on the Sources, method and limits page.