Nyanza climate — normals and trends
Nyanza (Rwanda) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 18.8 °C and it receives 921 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 August (19.9 °C on average) and the coldest is November (18.1 °C). Rainfall peaks in April.
Nyanza averages 0 frost days, 0 hot days (≥ 30 °C) and 171 rainy days per year.
Nyanza has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The hottest day of the period reached 31.7 °C (on 23 February 2005) and the coldest 8.1 °C (on 1 July 1972).
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
NyanzaSouthern Province
- coords
- -2.35°, 29.75°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.8°C
Average daily high
24.2°C
Average daily low
13.7°C
Annual rainfall
921mm
Sunshine / day
10.3h
Mean relative humidity
72%
Average peak wind
11.1km/h
Seasonal range
1.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
171 d/yr
Annual snowfall
0.0 cm
Average feels-like high
24.9 °C
Average feels-like low
13.7 °C
Average peak gust
30.3 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
18.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.51 · 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
31.7 °C
23 February 2005
Coldest day
8.1 °C
1 July 1972
Wettest day
66 mm
19 April 2020
Windiest day
21.0 km/h
2 October 1942
Strongest gust
56.9 km/h
17 October 2005
Hottest feels-like
32.6 °C
1 March 2020
Coldest feels-like
5.8 °C
30 July 1975
Sunniest day
12.0 h
2 January 1940
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 25.2 °C | +1.0 °C | 55 mm | -34 mm |
| Feb | 26.2 °C | +1.6 °C | 33 mm | -61 mm |
| Mar | 25.3 °C | +1.0 °C | 113 mm | -4 mm |
| Apr | 24.3 °C | +0.9 °C | 158 mm | +15 mm |
| May | 23.5 °C | +0.4 °C | 75 mm | -12 mm |
| Jun | 24.1 °C | +0.3 °C | 18 mm | +5 mm |
| Jul | 24.9 °C | +0.4 °C | 1 mm | -3 mm |
| Aug | 25.2 °C | -0.2 °C | 22 mm | +7 mm |
| Sep | 26.3 °C | +1.0 °C | 12 mm | -35 mm |
| Oct | 24.6 °C | +0.2 °C | 137 mm | +40 mm |
| Nov | 24.2 °C | +0.8 °C | 55 mm | -65 mm |
| Dec | 23.7 °C | +0.1 °C | 86 mm | -9 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 Nyanza?
Nyanza has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 18.8 °C and it receives 921 mm of precipitation per year.
What is the hottest day ever recorded in Nyanza?
The hottest day measured in Nyanza between 1940 and 2025 was 23 February 2005, reaching 31.7 °C.
What is the coldest day in Nyanza?
The coldest day measured in Nyanza between 1940 and 2025 was 1 July 1972, at 8.1 °C.
Does it snow in Nyanza?
Almost never: Nyanza sees virtually no snow, with about 0 frost days per year.
Has the climate of Nyanza warmed?
Yes: Nyanza warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Nyanza?
The wettest day measured in Nyanza between 1940 and 2025 was 19 April 2020, with 66 mm of rain in 24 hours.
What was the windiest day in Nyanza?
The windiest day measured in Nyanza between 1940 and 2025 was 2 October 1942, with winds reaching 21.0 km/h.
What is the warmest month in Nyanza?
The warmest month in Nyanza is August (19.9 °C on average); the coldest is November (18.1 °C).
How much does it rain in Nyanza?
Nyanza receives on average 921 mm of precipitation per year, spread over about 171 rainy days.
Is it sunny in Nyanza?
Nyanza gets on average 10.3 hours of sunshine per day, roughly 3,760 hours per year over 1940-2025.
Are there tropical nights in Nyanza?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Nyanza.
What was the most extreme apparent temperature in Nyanza?
In Nyanza, between 1940 and 2025, the highest apparent temperature reached 32.6 °C on 1 March 2020, and the lowest was 5.8 °C on 30 July 1975.
Compare Nyanza with another city
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Nearby cities
The climate around Nyanza