Yei weather in December

In December, Yei sees average daytime highs of 31°C and overnight lows near 20°C, with 21 mm of rain across 4 wet days and about 11.8 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 30°C in the first days to 32°C by the end. The sky is clear or mostly clear about 38% of the time in December, and the air most often feels humid.

Daylight stretches from about 11 h 48 min at the start of December to 11 h 48 min by month's end. Set against the rest of the year, December is Yei's 2nd-clearest and 4th-windiest month. For the whole year in context, see Yei's year-round climate.

Daytime high
31°
4th warmest
Overnight low
20°
7th coldest
Rainfall
21 mm
4 wet days
Daylight
11 h 48 min
7:01 AM – 6:46 PM
Cloud cover
54%
2nd clearest
Wind
8 km/h
4th windiest
Solar energy
5.59 kWh/m²
Travel score
5.3
out of 10

Yei is City in South Sudan.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 30°C in the first days to 32°C by the end.

A typical December day in Yei reaches about 31°C in the afternoon and slips back to 20°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 33°C. Set against its neighbours, December runs about 2°C warmer than November and about 2°C cooler than January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13020
23020
33020
43020
53020
63020
73020
83020
93020
103020
113020
123020
133020
143120
153120
163120
173120
183120
193120
203120
213120
223120
233120
243121
253121
263221
273221
283221
293221
303221
313221

How December really feels in Yei

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

December 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 December compares with the rest of the year at a glance. December is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 21°10211.84.5
Feb34° / 22°153.511.93.7
Mar33° / 22°6712.1123.4
Apr30° / 21°14619.712.13.5
May29° / 20°15521.612.24.0
Jun28° / 19°14321.812.24.4
Jul27° / 19°18324.612.24.3
Aug27° / 19°19926.912.14.0
Sep28° / 19°17824.4124.1
Oct28° / 19°22525.911.93.8
Nov29° / 20°1231611.84.6
Dec31° / 20°21411.85.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 21% of December, with mostly cloudy or overcast conditions the remaining 41%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25446
35545
45545
55644
65644
75644
85743
95743
105743
115842
125842
135941
146040
156040
166139
176238
186238
196238
206238
216337
226337
236238
246238
256238
266139
276139
286139
296040
306040
316040

Chance of precipitation in December

Any precipitation

Yei gets around 21 mm of rain over 4 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 13% and peaks near 25% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
125
224
324
423
522
621
721
820
919
1018
1117
1216
1315
1414
1513
1612
1711
1810
199
208
218
227
237
246
256
266
276
286
296
306
316

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the humid band about 34% of days. Sticky, muggy-or-worse air turns up on roughly 11% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14204631
24214729
34224727
45234725
56234723
67244722
78254720
89264619
911274617
1012284515
1114284414
1216294312
1318304111
1420314010
152231389
162432377
172632357
182932336
193132315
203432304
213632284
223832264
234032243
244232233
254431213
264631203
274831193
284930173
295130163
305329153
315528143

Wind in December

Winds average 8 km/h in December.

Across December, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 48 min at the start of December to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 6:54 AM to 7:07 AM, and sunset from 6:40 PM to 6:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:546:40
211.86:546:41
311.86:556:41
411.86:556:41
511.86:556:42
611.86:566:42
711.86:566:43
811.86:576:43
911.86:576:43
1011.86:586:44
1111.86:586:44
1211.86:596:45
1311.86:596:45
1411.87:006:45
1511.87:006:46
1611.87:016:46
1711.87:016:47
1811.87:016:47
1911.87:026:48
2011.87:026:48
2111.87:036:49
2211.87:036:49
2311.87:046:50
2411.87:046:50
2511.87:056:51
2611.87:056:51
2711.87:066:52
2811.87:066:52
2911.87:076:52
3011.87:076:53
3111.87:076:53

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.59 kWh/m².

For context, solar energy here swings from a low near 5 kWh/m² to a high of 6.1 kWh/m² in February across the year — December's 5.59 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.7Bright
235.7Bright
245.7Bright
255.7Bright
265.7Bright
275.7Bright
285.7Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in December

Hazard calendar for Yei

In seasonPeak

None of Yei's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Yei's rainy season runs April–November, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Yei?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.3
Sightseeing
1st-best month of the year
7.6
Beach & pool
1st-best month of the year

December is a reasonable time to visit Yei for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Yei in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Yei sees daytime highs around 31°C and nights near 20°C. Pack light clothes. Worth having: sun protection. About 4 days see rain.

light clothessun protection

UV index in Yei in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 10 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 17UV 15Dec 15UV 10
UV index (midday)Level
Jan11Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul11Extreme
Aug12Extreme
Sep13Extreme
Oct13Extreme
Nov10Extreme
Dec10Very high

Air quality in Yei in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December 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).

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyModeratePoorJan 1795 µg/m³Oct 1114 µg/m³
PM2.5 (µg/m³)Level
Jan101Unhealthy
Feb55Poor
Mar27Moderate
Apr15Moderate
May14Moderate
Jun21Moderate
Jul22Moderate
Aug17Moderate
Sep14Moderate
Oct13Moderate
Nov18Moderate
Dec49Poor
Location & terrain

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.

KobokoYumbeAruaMoyoJubaAruAdjumaniWatsa

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.

3 km
62 m
16 km
156 m
80 km
1,060 m
treesshrubsgrasslandcroplandartificial surfaces
December weather nearby: Koboko 82 km · Yumbe 94 km · Arua 122 km · Moyo 126 km · Juba 131 km · Aru 138 km · Adjumani 147 km · Watsa 173 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
Christian 61%folk religion 33%Muslim 6%

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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).