Climate averages 1991–2020
San Salvador weather
in December.
A hot, very dry month: the 5th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in San Salvador: daytime highs average 29.6°C and nights cool to about 19.5°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 6.8 mm of rain on roughly 1 day, which makes December a very dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 20 min on an average December day.
The nearest other city in this atlas is Soyapango (6 km away). In December its highs average 29.3°C, about as warm as San Salvador, with 6.8 mm of rain.
Among the 6 cities listed in El Salvador, San Salvador ranks 3rd of 6 for the warmest December highs and joint 3rd of 6 for the driest December (rainfall, lowest first). The mean December high of those 6 cities is 30.1°C; San Salvador is 0.5°C cooler than that mean.
From December to January, average highs rise by 0.7°C to 30.3°C, and monthly rainfall falls from 6.8 mm to 1.9 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
San Salvador climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.3°C19.3°C | 19.3°C | 1.9 | 0.6 | 11.411 h |
| February | 31.3°C19.8°C | 19.8°C | 2.0 | 0.5 | 11.712 h |
| March | 31.7°C20.6°C | 20.6°C | 9.8 | 2.9 | 12.012 h |
| April | 31.0°C21.6°C | 21.6°C | 50 | 11.3 | 12.412 h |
| May | 29.2°C21.7°C | 21.7°C | 222 | 24.9 | 12.813 h |
| June | 28.2°C21.4°C | 21.4°C | 248 | 26.2 | 12.913 h |
| July | 29.2°C21.2°C | 21.2°C | 186 | 22.3 | 12.813 h |
| August | 28.9°C21.3°C | 21.3°C | 230 | 26.0 | 12.613 h |
| September | 27.8°C21.0°C | 21.0°C | 303 | 28.4 | 12.212 h |
| October | 27.6°C20.6°C | 20.6°C | 232 | 23.3 | 11.812 h |
| November | 28.5°C19.9°C | 19.9°C | 45 | 7.6 | 11.512 h |
| December, selected | 29.6°C19.5°C | 19.5°C | 6.8 | 1.3 | 11.311 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Soyapango in DecemberEl Salvador · 6 kmHigh 29.3°C · Low 19.7°C · 6.8 mm rain
- Santa Tecla in DecemberEl Salvador · 10 kmHigh 27.7°C · Low 17.6°C · 6.8 mm rain
- Apopa in DecemberEl Salvador · 13 kmHigh 31.1°C · Low 20.2°C · 6.8 mm rain
- Santa Ana, El Salvador in DecemberEl Salvador · 52 kmHigh 29.3°C · Low 18.8°C · 5.3 mm rain
- Jutiapa in DecemberGuatemala · 101 kmHigh 27.4°C · Low 16.8°C · 4.4 mm rain
- San Miguel, El Salvador in DecemberEl Salvador · 111 kmHigh 33.6°C · Low 22.0°C · 5.7 mm rain
- Chiquimula in DecemberGuatemala · 130 kmHigh 25.0°C · Low 18.5°C · 16 mm rain
- Jalapa in DecemberGuatemala · 136 kmHigh 23.4°C · Low 13.9°C · 11 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for San Salvador) is explained once on the San Salvador year overview and on the Sources, method and limits page.
Soyapango, Santa Tecla and Apopa lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.