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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 95°F, while the coldest is July averaging around 33°F at night. Precipitation totals about 4 inches a year and is strongly seasonal — February alone averages 0.9 inches while July barely receives 0.05 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)San Juan climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 95 | 92 | 87 | 78 | 69 | 63 | 62 | 69 | 75 | 82 | 89 | 94 |
| Avg temp (°F) | 81 | 78 | 73 | 63 | 54 | 47 | 46 | 51 | 59 | 67 | 74 | 80 |
| Avg low (°F) | 68 | 65 | 61 | 52 | 43 | 35 | 33 | 37 | 44 | 52 | 59 | 64 |
| Precipitation (in) | 0.7 | 0.9 | 0.4 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.3 | 0.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 95 | 92 | 87 | 78 | 69 | 63 |
| Avg temp (°F) | 81 | 78 | 73 | 63 | 54 | 47 |
| Avg low (°F) | 68 | 65 | 61 | 52 | 43 | 35 |
| Precipitation (in) | 0.7 | 0.9 | 0.4 | 0.2 | 0.1 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 62 | 69 | 75 | 82 | 89 | 94 |
| Avg temp (°F) | 46 | 51 | 59 | 67 | 74 | 80 |
| Avg low (°F) | 33 | 37 | 44 | 52 | 59 | 64 |
| Precipitation (in) | 0.1 | 0.1 | 0.1 | 0.1 | 0.3 | 0.5 |
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 (mph) | 7.7 | 7.4 | 6.9 | 5.9 | 5.4 | 5.3 | 5.8 | 6.6 | 7.4 | 8.1 | 8.2 | 8.1 |
| 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 (mph) | 7.7 | 7.4 | 6.9 | 5.9 | 5.4 | 5.3 |
| 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 (mph) | 5.8 | 6.6 | 7.4 | 8.1 | 8.2 | 8.1 |
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.