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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 36°C, while the coldest is October averaging around 24°C at night. Precipitation totals about 1311 mm a year and is strongly seasonal — September alone averages 308 mm while February 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)La Unión climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 35 | 35 | 36 | 34 | 34 | 35 | 35 | 33 | 32 | 33 | 34 |
| Avg temp (°C) | 29 | 30 | 31 | 31 | 30 | 29 | 30 | 30 | 28 | 28 | 29 | 29 |
| Avg low (°C) | 24 | 25 | 26 | 26 | 26 | 25 | 26 | 25 | 24 | 24 | 24 | 24 |
| Precipitation (mm) | 4 | 0 | 4 | 29 | 197 | 237 | 83 | 137 | 308 | 268 | 33 | 10 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 35 | 35 | 36 | 34 | 34 |
| Avg temp (°C) | 29 | 30 | 31 | 31 | 30 | 29 |
| Avg low (°C) | 24 | 25 | 26 | 26 | 26 | 25 |
| Precipitation (mm) | 4 | 0 | 4 | 29 | 197 | 237 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 35 | 35 | 33 | 32 | 33 | 34 |
| Avg temp (°C) | 30 | 30 | 28 | 28 | 29 | 29 |
| Avg low (°C) | 26 | 25 | 24 | 24 | 24 | 24 |
| Precipitation (mm) | 83 | 137 | 308 | 268 | 33 | 10 |
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 (m/s) | 2.9 | 2.7 | 2.5 | 2.1 | 1.7 | 1.7 | 2.0 | 1.7 | 1.5 | 1.6 | 2.2 | 2.6 |
| 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 (m/s) | 2.9 | 2.7 | 2.5 | 2.1 | 1.7 | 1.7 |
| 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 (m/s) | 2.0 | 1.7 | 1.5 | 1.6 | 2.2 | 2.6 |
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.