Climate averages 1991–2020
Arsi Negele weather
in September.
A mild, 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 mild month in Arsi Negele: daytime highs average 21.0°C and nights cool to about 13.2°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 369 mm of rain on roughly 29 days, which makes September a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 10 min on an average September day.
The nearest other city in this atlas is Shashamane (19 km away). In September its highs average 21.4°C, about as warm as Arsi Negele, with 136 mm of rain.
Among the 40 cities listed in Ethiopia, Arsi Negele ranks 32nd of 40 for the warmest September highs and 37th of 40 for the driest September (rainfall, lowest first). The mean September high of those 40 cities is 23.6°C; Arsi Negele is 2.6°C cooler than that mean.
From September to October, average highs rise by 0.3°C to 21.3°C, and monthly rainfall falls from 369 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
Arsi Negele climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 23.2°C11.3°C | 11.3°C | 33 | 6.6 | 11.712 h |
| February | 24.5°C11.9°C | 11.9°C | 40 | 6.3 | 11.912 h |
| March | 24.9°C13.4°C | 13.4°C | 114 | 13.5 | 12.112 h |
| April | 23.6°C14.2°C | 14.2°C | 263 | 22.3 | 12.312 h |
| May | 22.4°C13.9°C | 13.9°C | 332 | 28.0 | 12.512 h |
| June | 21.4°C13.4°C | 13.4°C | 198 | 28.1 | 12.513 h |
| July | 20.2°C13.4°C | 13.4°C | 193 | 28.4 | 12.513 h |
| August | 20.4°C13.4°C | 13.4°C | 248 | 29.1 | 12.412 h |
| September, selected | 21.0°C13.2°C | 13.2°C | 369 | 29.3 | 12.212 h |
| October | 21.3°C13.1°C | 13.1°C | 261 | 22.0 | 12.012 h |
| November | 21.9°C11.9°C | 11.9°C | 68 | 8.8 | 11.812 h |
| December | 22.2°C10.9°C | 10.9°C | 27 | 5.4 | 11.712 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
- Shashamane in SeptemberEthiopia · 19 kmHigh 21.4°C · Low 13.0°C · 136 mm rain
- Awasa in SeptemberEthiopia · 39 kmHigh 23.1°C · Low 14.2°C · 171 mm rain
- Ziway in SeptemberEthiopia · 65 kmHigh 22.7°C · Low 15.6°C · 114 mm rain
- K’olīto in SeptemberEthiopia · 65 kmHigh 22.9°C · Low 13.6°C · 163 mm rain
- Yirga ‘Alem in SeptemberEthiopia · 73 kmHigh 22.3°C · Low 13.1°C · 224 mm rain
- Mek’ī in SeptemberEthiopia · 90 kmHigh 24.4°C · Low 15.6°C · 111 mm rain
- Butajīra in SeptemberEthiopia · 91 kmHigh 21.7°C · Low 12.9°C · 408 mm rain
- Hosa’ina in SeptemberEthiopia · 93 kmHigh 19.4°C · Low 10.6°C · 355 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 Arsi Negele) is explained once on the Arsi Negele year overview and on the Sources, method and limits page.