Yei climate — normals and trends
Yei (South Sudan) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 23.8 °C and it receives 1,640 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is February (26.6 °C on average) and the coldest is July (22.0 °C). Rainfall peaks in October.
Yei averages 0 frost days, 127 hot days (≥ 30 °C) and 217 rainy days per year.
Yei has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The hottest day of the period reached 38.8 °C (on 21 February 2005) and the coldest 14.2 °C (on 6 February 1957).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
YeiCentral Equatoria
- coords
- 4.09°, 30.68°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
23.8°C
Average daily high
29.1°C
Average daily low
19.7°C
Annual rainfall
1,640mm
Sunshine / day
10.5h
Mean relative humidity
71%
Average peak wind
10.6km/h
Seasonal range
4.6°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
127 d/yr
Rainy days (≥ 1 mm)
217 d/yr
Annual snowfall
0.0 cm
Average feels-like high
32.2 °C
Average feels-like low
21.2 °C
Average peak gust
28.2 km/h
Tropical nights (≥ 20 °C)
136 d/yr
Solar radiation
19.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.72 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
38.8 °C
21 February 2005
Coldest day
14.2 °C
6 February 1957
Wettest day
81 mm
1 November 1993
Windiest day
28.5 km/h
14 March 1992
Strongest gust
63.4 km/h
14 March 1992
Hottest feels-like
40.9 °C
25 February 2005
Coldest feels-like
10.9 °C
5 February 1957
Sunniest day
12.0 h
24 March 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 33.2 °C | +1.3 °C | 0 mm | -15 mm |
| Feb | 35.1 °C | +2.4 °C | 0 mm | -31 mm |
| Mar | 33.0 °C | +1.4 °C | 22 mm | -75 mm |
| Apr | 30.7 °C | +0.7 °C | 88 mm | -68 mm |
| May | 29.9 °C | +1.2 °C | 86 mm | -84 mm |
| Jun | 28.8 °C | +1.2 °C | 99 mm | -57 mm |
| Jul | 27.5 °C | +0.6 °C | 223 mm | +39 mm |
| Aug | 27.2 °C | +0.2 °C | 234 mm | +17 mm |
| Sep | 28.8 °C | +1.4 °C | 198 mm | -1 mm |
| Oct | 28.5 °C | +0.9 °C | 183 mm | -51 mm |
| Nov | 30.5 °C | +2.1 °C | 77 mm | -72 mm |
| Dec | 31.2 °C | +1.2 °C | 6 mm | -28 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Yei?
Yei has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 23.8 °C and it receives 1,640 mm of precipitation per year.
What is the hottest day ever recorded in Yei?
The hottest day measured in Yei between 1940 and 2025 was 21 February 2005, reaching 38.8 °C.
What is the coldest day in Yei?
The coldest day measured in Yei between 1940 and 2025 was 6 February 1957, at 14.2 °C.
Does it snow in Yei?
Almost never: Yei sees virtually no snow, with about 0 frost days per year.
Has the climate of Yei warmed?
Yes: Yei warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Yei?
The wettest day measured in Yei between 1940 and 2025 was 1 November 1993, with 81 mm of rain in 24 hours.
What was the windiest day in Yei?
The windiest day measured in Yei between 1940 and 2025 was 14 March 1992, with winds reaching 28.5 km/h.
What is the warmest month in Yei?
The warmest month in Yei is February (26.6 °C on average); the coldest is July (22.0 °C).
How much does it rain in Yei?
Yei receives on average 1,640 mm of precipitation per year, spread over about 217 rainy days.
Is it sunny in Yei?
Yei gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.
Are there tropical nights in Yei?
Yes: Yei has on average 136 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Yei?
In Yei, between 1940 and 2025, the highest apparent temperature reached 40.9 °C on 25 February 2005, and the lowest was 10.9 °C on 5 February 1957.
Compare Yei with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Yei