Addis Ababa weather in September
In September, Addis Ababa has daytime highs averaging 20 °C, nights around 10 °C, with 24 wet days. Figures are 1991–2020 climate normals.
- 19.8°C Average high
- 10.1°C Average low
- 24days Wet days
- 270mm Rainfall
- 12h Daylight
Daily temperatures through September
How September develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 September | 19.8 °C | 10.4 °C | 94 % |
| 11–20 September | 19.9 °C | 10.0 °C | 85 % |
| 21–30 September | 19.8 °C | 9.7 °C | 66 % |
- Rain is most likely over days 1–10 of September (94 % of days) and least likely over days 21–30 (66 %).
What to expect
| Measure | Typical September | Share of the month |
|---|---|---|
| Days above 25 °C | 0 of 30 | 0 % |
| Days above 30 °C | 0 of 30 | 0 % |
| Days below 0 °C | 0 of 30 | 0 % |
| Days with more than 1 mm rain | 24 of 30 | 81 % |
Conditions in September
| Measure | Average |
|---|---|
| Mean temperature | 15 °C |
| Record high (1991–2020) | 22 °C |
| Record low (1991–2020) | 4.8 °C |
| Relative humidity | 83 % |
| Wind speed | 11 km/h |
| Cloud cover | 60 % |
Where Addis Ababa ranks in September
| Ranking | Position | Value |
|---|---|---|
| The coolest places in Africa in September | 7thof 50 | 20 °C |
September compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| July | 19.6 °C | 369 mm | 74 % |
| August | 19.6 °C | 395 mm | 75 % |
| September | 19.8 °C | 270 mm | 60 % |
| October | 20.6 °C | 46 mm | 44 % |
| November | 21.4 °C | 10 mm | 35 % |
See all twelve months for Addis Ababa
- September is the 10th warmest month here.
- It is the 10th driest month of the year.
- It ranks 9th for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 24 of 30 days — 81 % of the month.
- Nights are about 9.7 °C cooler than the middle of the day.
- The hottest September day on record since 1991 reached 22 °C, 2.2 °C above the usual daytime high.
Nearby destinations in September
| Destination | Avg high | Wet days |
|---|---|---|
| Addis Ababa | 20 °C | 24 |
| Bishoftu | 22 °C | 20 |
| Nazrēt | 26 °C | 14 |
| Hosa’ina | 19 °C | 28 |
QuestionsSeptember in Addis Ababa, answered
How warm is Addis Ababa in September?
Daily highs average 20 °C and nights fall to about 10 °C, a spread of 9.7 °C between afternoon and dawn. That makes September the 8th warmest month of the year here.
Does it rain much in Addis Ababa in September?
September averages 270 mm of rain, spread over about 24 of the 30 days — 81 % of the month. Cloud cover averages 60 % of the sky.
How long are the days in September?
Addis Ababa averages 12 hours between sunrise and sunset in September. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.