Climate averages 1991–2020
Santa Tecla weather
by month.
See how the year changes. March has the highest average daily maximum; January has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: JanuaryNovemberDecember
Long-term climate patterns, not a forecast for a particular trip.
Across the year Santa Tecla averages a daytime high of 27.5°C and a nighttime low of 18.8°C, with about 1,535 mm of rain on roughly 175 days. March is the warmest month (average high 29.7°C) and October the coolest (25.7°C). September is the wettest month with 303 mm; January is the driest with 1.9 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): January, November and December. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Santa Tecla
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
Santa Tecla climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.4°C17.4°C | 17.4°C | 1.9 | 0.6 | 11.411 h |
| February | 29.3°C17.9°C | 17.9°C | 2.0 | 0.5 | 11.712 h |
| March | 29.7°C18.6°C | 18.6°C | 9.8 | 2.9 | 12.012 h |
| April | 29.1°C19.6°C | 19.6°C | 50 | 11.3 | 12.412 h |
| May | 27.3°C19.8°C | 19.8°C | 222 | 24.9 | 12.813 h |
| June | 26.3°C19.5°C | 19.5°C | 248 | 26.2 | 12.913 h |
| July | 27.2°C19.4°C | 19.4°C | 186 | 22.3 | 12.813 h |
| August | 27.0°C19.4°C | 19.4°C | 230 | 26.0 | 12.613 h |
| September | 25.8°C19.2°C | 19.2°C | 303 | 28.4 | 12.212 h |
| October | 25.7°C18.8°C | 18.8°C | 232 | 23.3 | 11.812 h |
| November | 26.7°C18.1°C | 18.1°C | 45 | 7.6 | 11.512 h |
| December | 27.7°C17.6°C | 17.6°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
Nearby cities
- San SalvadorEl Salvador · 10 kmHigh 29.4°C · Low 20.7°C · 1,535 mm rain a year
- SoyapangoEl Salvador · 16 kmHigh 29.2°C · Low 21.0°C · 1,535 mm rain a year
- ApopaEl Salvador · 18 kmHigh 31.3°C · Low 21.9°C · 1,535 mm rain a year
- Santa Ana, El SalvadorEl Salvador · 45 kmHigh 29.8°C · Low 20.3°C · 985 mm rain a year
- JutiapaGuatemala · 94 kmHigh 28.3°C · Low 18.5°C · 1,109 mm rain a year
- San Miguel, El SalvadorEl Salvador · 121 kmHigh 33.2°C · Low 23.6°C · 1,783 mm rain a year
- ChiquimulaGuatemala · 128 kmHigh 27.9°C · Low 20.5°C · 1,094 mm rain a year
- JalapaGuatemala · 131 kmHigh 24.9°C · Low 15.7°C · 1,075 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-6, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 13.70°, -89.30° (3 km from the city centre), adjusted down by 0.5°C for the difference between the city's elevation (965 m) and the cell's (881 m). Rain comes from the 0.25° cell at 13.75°, -89.25°. San Salvador, Soyapango 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. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.