Climate averages 1991–2020
Santa Tecla weather
in September.
A warm, very wet month: the 11th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Santa Tecla: daytime highs average 25.8°C and nights cool to about 19.2°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 303 mm of rain on roughly 28 days, which makes September a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 13 min on an average September day.
The nearest other city in this atlas is San Salvador (10 km away). In September its highs average 27.8°C, 1.9°C warmer than Santa Tecla, with 303 mm of rain.
Among the 6 cities listed in El Salvador, Santa Tecla ranks 6th of 6 for the warmest September highs and joint 2nd of 6 for the driest September (rainfall, lowest first). The mean September high of those 6 cities is 28.3°C; Santa Tecla is 2.5°C cooler than that mean.
From September to October, average highs fall by 0.1°C to 25.7°C, and monthly rainfall falls from 303 mm to 232 mm.
The annual picture
September 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
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, selected | 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
September in nearby cities
- San Salvador in SeptemberEl Salvador · 10 kmHigh 27.8°C · Low 21.0°C · 303 mm rain
- Soyapango in SeptemberEl Salvador · 16 kmHigh 27.5°C · Low 21.4°C · 303 mm rain
- Apopa in SeptemberEl Salvador · 18 kmHigh 29.5°C · Low 22.4°C · 303 mm rain
- Santa Ana, El Salvador in SeptemberEl Salvador · 45 kmHigh 28.5°C · Low 20.9°C · 213 mm rain
- Jutiapa in SeptemberGuatemala · 94 kmHigh 27.3°C · Low 19.3°C · 236 mm rain
- San Miguel, El Salvador in SeptemberEl Salvador · 121 kmHigh 30.9°C · Low 23.6°C · 343 mm rain
- Chiquimula in SeptemberGuatemala · 128 kmHigh 28.5°C · Low 21.5°C · 223 mm rain
- Jalapa in SeptemberGuatemala · 131 kmHigh 24.5°C · Low 16.8°C · 216 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 Santa Tecla) is explained once on the Santa Tecla year overview and on the Sources, method and limits page.
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.