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La Unión, El Salvador climate
As Tropical savanna (dry summer)
La Unión has a remarkably steady tropical climate (Tropical savanna (dry summer), Köppen As). The hottest month is April with an average daily high near 96°F, while the coldest is October averaging around 75°F at night. Precipitation totals about 52 inches a year and is strongly seasonal — September alone averages 12.1 inches while February barely receives 0.02 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)La Unión climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 94 | 95 | 96 | 96 | 94 | 92 | 95 | 94 | 91 | 90 | 92 | 93 |
| Avg temp (°F) | 85 | 86 | 87 | 88 | 86 | 85 | 86 | 86 | 83 | 83 | 84 | 84 |
| Avg low (°F) | 76 | 77 | 78 | 79 | 78 | 77 | 78 | 77 | 76 | 75 | 76 | 76 |
| Precipitation (in) | 0.2 | 0.0 | 0.1 | 1.1 | 7.8 | 9.3 | 3.3 | 5.4 | 12.1 | 10.6 | 1.3 | 0.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 94 | 95 | 96 | 96 | 94 | 92 |
| Avg temp (°F) | 85 | 86 | 87 | 88 | 86 | 85 |
| Avg low (°F) | 76 | 77 | 78 | 79 | 78 | 77 |
| Precipitation (in) | 0.2 | 0.0 | 0.1 | 1.1 | 7.8 | 9.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 95 | 94 | 91 | 90 | 92 | 93 |
| Avg temp (°F) | 86 | 86 | 83 | 83 | 84 | 84 |
| Avg low (°F) | 78 | 77 | 76 | 75 | 76 | 76 |
| Precipitation (in) | 3.3 | 5.4 | 12.1 | 10.6 | 1.3 | 0.4 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 25 | 25 | 30 | 48 | 69 | 71 | 65 | 64 | 72 | 66 | 45 | 29 |
| Relative humidity (%) | 54 | 50 | 49 | 53 | 66 | 76 | 70 | 70 | 79 | 80 | 71 | 61 |
| Wind speed (mph) | 6.4 | 6.1 | 5.7 | 4.7 | 3.9 | 3.7 | 4.4 | 3.8 | 3.4 | 3.5 | 4.8 | 5.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 25 | 25 | 30 | 48 | 69 | 71 |
| Relative humidity (%) | 54 | 50 | 49 | 53 | 66 | 76 |
| Wind speed (mph) | 6.4 | 6.1 | 5.7 | 4.7 | 3.9 | 3.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 65 | 64 | 72 | 66 | 45 | 29 |
| Relative humidity (%) | 70 | 70 | 79 | 80 | 71 | 61 |
| Wind speed (mph) | 4.4 | 3.8 | 3.4 | 3.5 | 4.8 | 5.8 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 24 years of daily observations at Amapala/los Pelonas, a weather station, about 20 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.