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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.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours 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 (mph) | 5.4 | 5.8 | 5.1 | 4.2 | 3.2 | 3.1 | 3.0 | 3.0 | 3.0 | 3.0 | 3.9 | 4.7 |
| 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 (mph) | 5.4 | 5.8 | 5.1 | 4.2 | 3.2 | 3.1 |
| 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 (mph) | 3.0 | 3.0 | 3.0 | 3.0 | 3.9 | 4.7 |
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.