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San Juan, Argentina climate
BWh Hot desert
San Juan has a seasonal mild-temperate climate (Hot desert, Köppen BWh). The hottest month is January with an average daily high near 35°C, while the coldest is July averaging around 0°C at night. Precipitation totals about 91 mm a year and is strongly seasonal — February alone averages 23 mm while July barely receives 1 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)San Juan climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 35 | 33 | 31 | 25 | 21 | 17 | 17 | 20 | 24 | 28 | 32 | 34 |
| Avg temp (°C) | 27 | 26 | 23 | 17 | 12 | 8 | 8 | 11 | 15 | 20 | 24 | 26 |
| Avg low (°C) | 20 | 18 | 16 | 11 | 6 | 2 | 0 | 3 | 7 | 11 | 15 | 18 |
| Precipitation (mm) | 17 | 23 | 11 | 5 | 3 | 2 | 1 | 3 | 4 | 3 | 7 | 12 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 35 | 33 | 31 | 25 | 21 | 17 |
| Avg temp (°C) | 27 | 26 | 23 | 17 | 12 | 8 |
| Avg low (°C) | 20 | 18 | 16 | 11 | 6 | 2 |
| Precipitation (mm) | 17 | 23 | 11 | 5 | 3 | 2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 20 | 24 | 28 | 32 | 34 |
| Avg temp (°C) | 8 | 11 | 15 | 20 | 24 | 26 |
| Avg low (°C) | 0 | 3 | 7 | 11 | 15 | 18 |
| Precipitation (mm) | 1 | 3 | 4 | 3 | 7 | 12 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 42 | 41 | 39 | 38 | 44 | 41 | 39 | 34 | 35 | 37 | 35 | 36 |
| Relative humidity (%) | 41 | 45 | 50 | 53 | 56 | 54 | 50 | 43 | 39 | 37 | 36 | 37 |
| Wind speed (km/h) | 12.4 | 11.9 | 11.1 | 9.5 | 8.7 | 8.5 | 9.3 | 10.7 | 11.9 | 13.0 | 13.2 | 13.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 42 | 41 | 39 | 38 | 44 | 41 |
| Relative humidity (%) | 41 | 45 | 50 | 53 | 56 | 54 |
| Wind speed (km/h) | 12.4 | 11.9 | 11.1 | 9.5 | 8.7 | 8.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 39 | 34 | 35 | 37 | 35 | 36 |
| Relative humidity (%) | 50 | 43 | 39 | 37 | 36 | 37 |
| Wind speed (km/h) | 9.3 | 10.7 | 11.9 | 13.0 | 13.2 | 13.0 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the WMO's CLINO 1991–2020 collection, measured at San_juan_aero, about 11 km from the city centre.
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.