Climate averages 1991–2020
Gao weather
in September.
A very hot, fairly dry month: the joint 4th 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 Gao: daytime highs average 39.2°C and nights cool to about 26.7°C. By daytime temperature it is the joint 4th warmest of the 12 months.
Expect about 16 mm of rain on roughly 4 days, which makes September a fairly dry month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 14 min on an average September day.
The nearest other city in this atlas is Timbuktu (321 km away). In September its highs average 38.4°C, 0.9°C cooler than Gao, with 16 mm of rain.
Among the 13 cities listed in Mali, Gao ranks 1st of 13 for the warmest September highs and joint 1st of 13 for the driest September (rainfall, lowest first). The mean September high of those 13 cities is 31.9°C; Gao is 7.3°C warmer than that mean.
From September to October, average highs stay level at 39.2°C, and monthly rainfall falls from 16 mm to 2.6 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
Gao climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.0°C14.4°C | 14.4°C | 0.3 | 0.1 | 11.311 h |
| February | 33.3°C16.7°C | 16.7°C | 0.1 | 0.0 | 11.612 h |
| March | 37.2°C20.0°C | 20.0°C | 0.1 | 0.0 | 12.012 h |
| April | 40.8°C24.1°C | 24.1°C | 0.6 | 0.2 | 12.512 h |
| May | 42.2°C27.4°C | 27.4°C | 2.3 | 0.8 | 12.913 h |
| June | 41.7°C28.7°C | 28.7°C | 7.6 | 2.8 | 13.113 h |
| July | 39.0°C27.2°C | 27.2°C | 31 | 7.9 | 13.013 h |
| August | 37.0°C26.0°C | 26.0°C | 56 | 11.2 | 12.713 h |
| September, selected | 39.2°C26.7°C | 26.7°C | 16 | 4.3 | 12.212 h |
| October | 39.2°C24.9°C | 24.9°C | 2.6 | 0.8 | 11.812 h |
| November | 35.7°C19.8°C | 19.8°C | 0.1 | 0.0 | 11.411 h |
| December | 31.7°C15.9°C | 15.9°C | 0.1 | 0.0 | 11.211 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
- Timbuktu in SeptemberMali · 321 kmHigh 38.4°C · Low 26.5°C · 16 mm rain
- Kaya in SeptemberBurkina Faso · 371 kmHigh 32.3°C · Low 23.1°C · 80 mm rain
- Niamey in SeptemberNiger · 384 kmHigh 34.5°C · Low 24.7°C · 45 mm rain
- Ouahigouya in SeptemberBurkina Faso · 393 kmHigh 32.9°C · Low 23.5°C · 85 mm rain
- Pouytenga in SeptemberBurkina Faso · 449 kmHigh 31.4°C · Low 22.9°C · 98 mm rain
- Saaba in SeptemberBurkina Faso · 458 kmHigh 31.5°C · Low 23.1°C · 108 mm rain
- Ouagadougou in SeptemberBurkina Faso · 463 kmHigh 31.5°C · Low 23.1°C · 108 mm rain
- Fada N'gourma in SeptemberBurkina Faso · 470 kmHigh 30.8°C · Low 22.8°C · 105 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 Gao) is explained once on the Gao year overview and on the Sources, method and limits page.