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Saint-Louis, Senegal climate
BWh Hot desert
Saint-Louis has a remarkably steady tropical climate (Hot desert, Köppen BWh). The hottest month is October with an average daily high near 34°C, while the coldest is January averaging around 17°C at night. Precipitation totals about 317 mm a year and is strongly seasonal — September alone averages 114 mm while May barely receives 0 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)Saint-Louis climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 32 | 33 | 31 | 30 | 31 | 31 | 32 | 33 | 34 | 35 | 32 |
| Avg temp (°C) | 24 | 25 | 26 | 25 | 25 | 27 | 28 | 29 | 29 | 29 | 28 | 25 |
| Avg low (°C) | 17 | 18 | 18 | 19 | 20 | 23 | 25 | 25 | 25 | 24 | 21 | 18 |
| Precipitation (mm) | 5 | 6 | 1 | 0 | 0 | 11 | 45 | 98 | 114 | 28 | 0 | 9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 32 | 33 | 31 | 30 | 31 |
| Avg temp (°C) | 24 | 25 | 26 | 25 | 25 | 27 |
| Avg low (°C) | 17 | 18 | 18 | 19 | 20 | 23 |
| Precipitation (mm) | 5 | 6 | 1 | 0 | 0 | 11 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 32 | 33 | 34 | 35 | 32 |
| Avg temp (°C) | 28 | 29 | 29 | 29 | 28 | 25 |
| Avg low (°C) | 25 | 25 | 25 | 24 | 21 | 18 |
| Precipitation (mm) | 45 | 98 | 114 | 28 | 0 | 9 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 55 | 55 | 47 | 46 | 48 | 53 | 61 | 65 | 60 | 52 | 60 | 60 |
| Relative humidity (%) | 36 | 39 | 45 | 54 | 57 | 61 | 67 | 72 | 73 | 62 | 48 | 40 |
| Wind speed (m/s) | 3.9 | 4.2 | 4.3 | 4.7 | 4.6 | 4.1 | 3.8 | 3.1 | 2.5 | 2.7 | 3.2 | 3.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 55 | 55 | 47 | 46 | 48 | 53 |
| Relative humidity (%) | 36 | 39 | 45 | 54 | 57 | 61 |
| Wind speed (m/s) | 3.9 | 4.2 | 4.3 | 4.7 | 4.6 | 4.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 65 | 60 | 52 | 60 | 60 |
| Relative humidity (%) | 67 | 72 | 73 | 62 | 48 | 40 |
| Wind speed (m/s) | 3.8 | 3.1 | 2.5 | 2.7 | 3.2 | 3.7 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Saint Louis Ousmane Masseck Ndiaye, a weather station, about 5 km from the city centre. The underlying daily records come from NOAA's global station network.
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.