Yei climate
Yei (South Sudan) has a tropical savanna (dry winter) climate (Köppen Aw). The average temperature over the year is 26 °C78 °F, and about 1,164 mm46 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Yei climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 3594 | 2068 | 2781 | 110.4 |
| Feb | 3697 | 2271 | 2984 | 150.6 |
| Mar | 3595 | 2272 | 2983 | 592.3 |
| Apr | 3391 | 2170 | 2780 | 1034.0 |
| May | 3086 | 2069 | 2577 | 1385.4 |
| Jun | 2984 | 1967 | 2476 | 1124.4 |
| Jul | 2983 | 1966 | 2475 | 1194.7 |
| Aug | 2883 | 1966 | 2474 | 1857.3 |
| Sep | 2883 | 1966 | 2475 | 1536.0 |
| Oct | 2984 | 2067 | 2476 | 1505.9 |
| Nov | 3086 | 1967 | 2576 | 823.2 |
| Dec | 3290 | 1967 | 2678 | 371.5 |
| Year | 3697 | 1966 | 2678 | 1,16446 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 41% | 57% | 6.1 | 11:54 |
| Feb | 38% | 67% | 6.0 | 11:59 |
| Mar | 51% | 78% | 5.7 | 12:05 |
| Apr | 65% | 81% | 5.5 | 12:12 |
| May | 75% | 76% | 5.5 | 12:18 |
| Jun | 76% | 76% | 5.0 | 12:21 |
| Jul | 76% | 77% | 4.8 | 12:20 |
| Aug | 79% | 76% | 5.1 | 12:15 |
| Sep | 79% | 72% | 5.6 | 12:08 |
| Oct | 78% | 78% | 5.5 | 12:01 |
| Nov | 72% | 69% | 5.5 | 11:56 |
| Dec | 56% | 50% | 5.8 | 11:53 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Yei is like
The warmest month is February, with an average high of 36 °C97 °F and a low of 22 °C71 °F. The coldest is August, when highs average 28 °C83 °F and lows 19 °C66 °F. Seasonal differences are small — just 5.4 °C9.8 °F between the warmest and the coolest month.
It is wet, with about 1,164 mm46 in of precipitation per year. The wettest three-month stretch is August–October, which brings 42% of the annual total. Months with less than 20 mm0.8 in on average: January and February. The wettest month is August (185 mm7.3 in), the driest is January (11 mm0.4 in).
Relative humidity ranges from 38% in February to 79% in September. The clearest skies (lowest average cloud amount, 50%) are typical of December. Average wind speed near the ground ranges from 5 km/h (3 mph) in August to 10 km/h (6 mph) in February.
Best time to visit Yei
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June and July and November: average highs of 29 °C83 °F to 30 °C86 °F with 82 mm3.2 in to 119 mm4.7 in of precipitation per month.
The most challenging month is February, which is hot, with average highs of 36 °C97 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Yei
- Wetter months (April–October) — highs 2883 to 33 °C91 °F, lows 1966 to 21 °C70 °F, about 137 mm5.4 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Drier months (November–March) — highs 3086 to 36 °C97 °F, lows 1967 to 22 °C72 °F, about 41 mm1.6 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
How Yei compares
Compared with Juba, about 131 km to the northeast, Yei is on average 2.9 °C5.3 °F cooler and receives 24% more precipitation (1,164 mm46 in vs 936 mm37 in). The difference is largest in April (3.5 °C6.3 °F cooler).
Of the 5 places in South Sudan covered by World Climates, Yei is the 5th warmest by annual mean temperature and the wettest by annual precipitation. See all of them on the South Sudan climate page.
Places in other countries with the most similar temperature and rainfall pattern: Gulu (Uganda, Aw), Lira (Uganda, Aw) and Bouaké (Ivory Coast, Aw).
Nearby places
- Juba 131 km · 28 °C83 °F · 936 mm37 in
- Gulu 232 km · 25 °C76 °F · 1,084 mm43 in
- Bunia 286 km · 22 °C71 °F · 1,128 mm44 in
- Masindi 293 km · 23 °C74 °F · 1,049 mm41 in
- Hoima 305 km · 24 °C75 °F · 1,063 mm42 in
- Lira 321 km · 25 °C77 °F · 953 mm38 in
- Bakwa 364 km · 25 °C76 °F · 1,593 mm63 in
- Isiro 370 km · 23 °C74 °F · 1,959 mm77 in
Frequently asked questions
What is the warmest month in Yei?
February is the warmest month in Yei, with an average high of 36 °C (97 °F) and an average low of 22 °C (71 °F).
What is the coldest month in Yei?
August is the coldest month, with an average high of 28 °C (83 °F) and an average low of 19 °C (66 °F).
When does it rain the most in Yei?
August is the wettest month with about 185 mm (7.3 in) of precipitation; January is the driest with about 11 mm (0.4 in).
What is the best time to visit Yei?
Judging by long-term averages, the most comfortable months are June and July and November.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 899 m, while Yei lies at about 836 m. Temperatures on this page were therefore adjusted by +0.4 °C0.7 °F using the standard lapse rate of 6.5 °C per 1,000 m.