Yei in Summer
In summer (June, July and August), Yei sees average daytime highs around 27°C and overnight lows near 19°C, with 525 mm of rain over about 73 wet days across the season. It is the coldest season of the year and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 27°C. The sky is clear or mostly clear about 11% of the time across summer, and the air most often feels muggy.
Summer is Yei's 2nd-best season to visit on our travel score. For the whole year in context, see Yei's year-round climate.
- Avg daytime high
- 27°C
- coldest season of the year
- Avg overnight low
- 19°C
- Rainfall
- 525 mm
- 73 wet days
- Avg wind
- 5 km/h
- Travel score
- 4.2
- 2nd-best season
- Months
- Jun · Jul · Aug
Temperature in Yei in Summer
Across summer, daytime highs hold fairly steady around 27°C.
A typical summer day in Yei reaches about 27°C and drops to 19°C overnight. The warmest of the three months is June, the coolest August.
How summer really feels in Yei
Once humidity and wind are folded in, summer brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Yei weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 33° / 21° | 10 | 2 | 11.8 | 4.5 |
| Feb | 34° / 22° | 15 | 3.5 | 11.9 | 3.7 |
| Mar | 33° / 22° | 67 | 12.1 | 12 | 3.4 |
| Apr | 30° / 21° | 146 | 19.7 | 12.1 | 3.5 |
| May | 29° / 20° | 155 | 21.6 | 12.2 | 4.0 |
| Jun | 28° / 19° | 143 | 21.8 | 12.2 | 4.4 |
| Jul | 27° / 19° | 183 | 24.6 | 12.2 | 4.3 |
| Aug | 27° / 19° | 199 | 26.9 | 12.1 | 4.0 |
| Sep | 28° / 19° | 178 | 24.4 | 12 | 4.1 |
| Oct | 28° / 19° | 225 | 25.9 | 11.9 | 3.8 |
| Nov | 29° / 20° | 123 | 16 | 11.8 | 4.6 |
| Dec | 31° / 20° | 21 | 4 | 11.8 | 5.3 |
Cloud cover in Summer
The sky is clear or mostly clear about 11% of the time across summer.
Chance of precipitation in Summer
Yei gets around 525 mm of rain over 73 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 5 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 12 min in early June to 12 h 06 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.1 kWh/m².
Hazard calendar for Yei
In summer, Yei overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Yei's rainy season runs April–November, when most of the year's rain falls.
Is summer a good time to visit Yei?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Yei for sightseeing.
What to pack for Yei in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Yei sees daytime highs around 27°C and nights near 19°C. Pack light clothes and rain gear. Worth having: sun protection. About 73 days see rain.
UV index in Yei in Summer
Clear-sky midday UV across summer averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Yei peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 10 (extreme).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 11 | 14 | 15 | 14 | 12 | 10 | 11 | 12 | 13 | 13 | 10 | 10 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 14 | Extreme |
| Mar | 15 | Extreme |
| Apr | 14 | Extreme |
| May | 12 | Extreme |
| Jun | 10 | Extreme |
| Jul | 11 | Extreme |
| Aug | 12 | Extreme |
| Sep | 13 | Extreme |
| Oct | 13 | Extreme |
| Nov | 10 | Extreme |
| Dec | 10 | Very high |
Air quality in Yei in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Yei is worst in January — around 101 µg/m³ PM2.5 (unhealthy), about 7.6× the cleanest month (October, 13 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 101 | 55 | 27 | 15 | 14 | 21 | 22 | 17 | 14 | 13 | 18 | 49 |
| Level | Unhealthy | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 101 | Unhealthy |
| Feb | 55 | Poor |
| Mar | 27 | Moderate |
| Apr | 15 | Moderate |
| May | 14 | Moderate |
| Jun | 21 | Moderate |
| Jul | 22 | Moderate |
| Aug | 17 | Moderate |
| Sep | 14 | Moderate |
| Oct | 13 | Moderate |
| Nov | 18 | Moderate |
| Dec | 49 | Poor |
Where is Yei?
Yei sits at 4.1°N, 30.7°E, 836 m above sea level, in South Sudan. The nearest listed city is Koboko, 82 km away.
Topography around Yei
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Yei.
Within 3 km, the terrain around Yei has only modest variations in elevation — a maximum elevation change of 62 m around an average of 824 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 156 m; within 80 km, large variations in elevation — a maximum elevation change of 1,060 m.
The land around Yei is covered by shrubs (46%) and trees (21%) within 3 km, shrubs (51%) and grassland (34%) within 16 km, and shrubs (50%) and trees (34%) within 80 km.
South Sudan travel facts
- Travel advisory
- Level 4
- Do Not Travel
- Prices
- ≈ 6% of US
- price level, 2021
- GDP per capita
- $1,080
- 2015
- Happiness
- 2.8 / 10
- World Happiness, 2019
- Homicide rate
- 14
- per 100k, 2012
- Road deaths
- 36.7
- per 100k/yr, 2019
- Income group
- Low
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Yei (4.0944°, 30.6764°, elevation 836 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.