Yei, South Sudan climate

As Tropical savanna (dry summer)

Yei has a remarkably steady tropical climate (Tropical savanna (dry summer), Köppen As). The hottest month is March with an average daily high near 35°C, while the coldest is August averaging around 19°C at night. Precipitation totals about 1402 mm a year and is strongly seasonal — October alone averages 220 mm while January barely receives 11 mm.

☀️ All year

Very hot

Daytime highs near 35°C most of the year.

About 127 days a year above 32 °C

🌙 Nights

Stays warm

Even the coolest nights stay near 19°C.

🌧️ Rain

Wet

About 1402 mm of rain a year.

Wettest in October

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Yei climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	34	36	35	32	30	28	28	28	28	28	29	32
Avg temp (°C)	27	29	29	27	25	24	23	23	24	24	24	26
Avg low (°C)	20	21	22	21	20	19	19	19	19	19	19	19
Precipitation (mm)	11	15	68	150	152	131	161	177	167	220	128	21

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	34	36	35	32	30	28
Avg temp (°C)	27	29	29	27	25	24
Avg low (°C)	20	21	22	21	20	19
Precipitation (mm)	11	15	68	150	152	131

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	28	28	28	28	29	32
Avg temp (°C)	23	23	24	24	24	26
Avg low (°C)	19	19	19	19	19	19
Precipitation (mm)	161	177	167	220	128	21

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with high ≥ 32°C (days)	23	26	26	16	6	3	2	0.6	1	2	6	15

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with high ≥ 32°C (days)	23	26	26	16	6	3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with high ≥ 32°C (days)	2	0.6	1	2	6	15

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	54	60	75	80	73	73	76	74	69	75	66	48
Relative humidity (%)	45	40	51	66	76	78	79	80	80	80	74	59
Wind speed (m/s)	2.4	2.6	2.3	1.9	1.4	1.4	1.3	1.3	1.3	1.4	1.7	2.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	54	60	75	80	73	73
Relative humidity (%)	45	40	51	66	76	78
Wind speed (m/s)	2.4	2.6	2.3	1.9	1.4	1.4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	76	74	69	75	66	48
Relative humidity (%)	79	80	80	80	74	59
Wind speed (m/s)	1.3	1.3	1.3	1.4	1.7	2.1

Methodology & sources

Temperature & precipitation — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →