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Nyanza, Rwanda climate
BSh Hot semi-arid
Nyanza has a remarkably steady warm-temperate climate (Hot semi-arid, Köppen BSh). The hottest month is September with an average daily high near 84°F, while the coldest is June averaging around 57°F at night. Precipitation totals about 25 inches a year and is strongly seasonal — April alone averages 4.2 inches while July barely receives 0.10 inches.
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)Nyanza climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 80 | 82 | 80 | 78 | 78 | 79 | 81 | 83 | 84 | 81 | 78 | 79 |
| Avg temp (°F) | 70 | 71 | 70 | 69 | 69 | 68 | 68 | 71 | 72 | 71 | 70 | 70 |
| Avg low (°F) | 61 | 61 | 61 | 61 | 60 | 57 | 56 | 58 | 61 | 61 | 61 | 61 |
| Precipitation (in) | 2.2 | 2.2 | 3.0 | 4.2 | 2.1 | 0.3 | 0.1 | 0.4 | 1.2 | 3.1 | 3.4 | 2.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 80 | 82 | 80 | 78 | 78 | 79 |
| Avg temp (°F) | 70 | 71 | 70 | 69 | 69 | 68 |
| Avg low (°F) | 61 | 61 | 61 | 61 | 60 | 57 |
| Precipitation (in) | 2.2 | 2.2 | 3.0 | 4.2 | 2.1 | 0.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 81 | 83 | 84 | 81 | 78 | 79 |
| Avg temp (°F) | 68 | 71 | 72 | 71 | 70 | 70 |
| Avg low (°F) | 56 | 58 | 61 | 61 | 61 | 61 |
| Precipitation (in) | 0.1 | 0.4 | 1.2 | 3.1 | 3.4 | 2.7 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with high ≥ 90°F (days) | 0.2 | 1 | 0.2 | 0.0 | — | — | — | — | 0.5 | 0.3 | 0.0 | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with high ≥ 90°F (days) | 0.2 | 1 | 0.2 | 0.0 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with high ≥ 90°F (days) | — | — | 0.5 | 0.3 | 0.0 | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 77 | 79 | 82 | 75 | 58 | 48 | 58 | 70 | 79 | 82 | 77 |
| Relative humidity (%) | 73 | 72 | 76 | 81 | 79 | 69 | 61 | 58 | 61 | 70 | 77 | 76 |
| Wind speed (mph) | 2.7 | 2.8 | 2.9 | 3.2 | 3.6 | 3.9 | 4.3 | 4.5 | 4.3 | 3.8 | 3.2 | 2.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 77 | 79 | 82 | 75 | 58 |
| Relative humidity (%) | 73 | 72 | 76 | 81 | 79 | 69 |
| Wind speed (mph) | 2.7 | 2.8 | 2.9 | 3.2 | 3.6 | 3.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 48 | 58 | 70 | 79 | 82 | 77 |
| Relative humidity (%) | 61 | 58 | 61 | 70 | 77 | 76 |
| Wind speed (mph) | 4.3 | 4.5 | 4.3 | 3.8 | 3.2 | 2.8 |
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.