Climate averages 1991–2020
Yei weather
in September.
A warm, wet month: the joint 9th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Yei: daytime highs average 27.9°C and nights cool to about 19.0°C. By daytime temperature it is the joint 9th warmest of the 12 months.
Expect about 178 mm of rain on roughly 24 days, which makes September a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 08 min on an average September day.
The nearest other city in this atlas is Arua (122 km away). In September its highs average 26.6°C, 1.4°C cooler than Yei, with 105 mm of rain.
Among the 6 cities listed in South Sudan, Yei ranks 6th of 6 for the warmest September highs and 6th of 6 for the driest September (rainfall, lowest first). The mean September high of those 6 cities is 30.0°C; Yei is 2.1°C cooler than that mean.
From September to October, average highs stay level at 28.0°C, and monthly rainfall rises from 178 mm to 225 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
Yei climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 33.3°C21.6°C | 21.6°C | 9.5 | 2.0 | 11.912 h |
| February | 34.4°C22.7°C | 22.7°C | 15 | 3.4 | 12.012 h |
| March | 33.0°C22.5°C | 22.5°C | 67 | 12.2 | 12.112 h |
| April | 30.6°C21.4°C | 21.4°C | 146 | 19.7 | 12.212 h |
| May | 29.0°C20.5°C | 20.5°C | 155 | 21.7 | 12.312 h |
| June | 27.9°C19.5°C | 19.5°C | 143 | 22.0 | 12.412 h |
| July | 27.3°C18.8°C | 18.8°C | 183 | 24.6 | 12.312 h |
| August | 27.5°C18.8°C | 18.8°C | 199 | 27.2 | 12.212 h |
| September, selected | 27.9°C19.0°C | 19.0°C | 178 | 24.4 | 12.112 h |
| October | 28.0°C19.3°C | 19.3°C | 225 | 25.9 | 12.012 h |
| November | 29.1°C19.7°C | 19.7°C | 123 | 16.2 | 11.912 h |
| December | 31.2°C20.4°C | 20.4°C | 21 | 4.0 | 11.912 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
- Arua in SeptemberUganda · 122 kmHigh 26.6°C · Low 17.2°C · 105 mm rain
- Juba in SeptemberSouth Sudan · 131 kmHigh 30.2°C · Low 21.7°C · 113 mm rain
- Gulu in SeptemberUganda · 232 kmHigh 27.5°C · Low 18.3°C · 163 mm rain
- Bunia in SeptemberDemocratic Republic of the Congo · 286 kmHigh 26.0°C · Low 17.5°C · 129 mm rain
- Masindi in SeptemberUganda · 293 kmHigh 26.7°C · Low 18.1°C · 145 mm rain
- Hoima in SeptemberUganda · 305 kmHigh 26.5°C · Low 18.1°C · 280 mm rain
- Lira in SeptemberUganda · 321 kmHigh 27.9°C · Low 18.1°C · 117 mm rain
- Bakwa in SeptemberDemocratic Republic of the Congo · 364 kmHigh 28.2°C · Low 20.4°C · 175 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 Yei) is explained once on the Yei year overview and on the Sources, method and limits page.