San Salvador weather in September
September in San Salvador: sweltering, soaked, with very humid — a fair time to visit.
#11 of 12 months in San Salvador · #555 of 604 destinations to visit in September · comfort 54/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
San Salvador climate normals — September
| Daytime high | 28°C / 83°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 22°C / 71°F | |
| Feels like (high) | 34°C / 93°F | |
| Rainfall | 279 mm / 11 in | ⛈ soaked |
| Rainy days | 28 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 22°C / 71°F | |
| Sunshine | 9.6 h/day | |
| Daylight | 12.2 h | |
| Wind | 7 km/h / 4 mph | |
| Air quality (US AQI) | 51 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San Salvador in September — FAQ
- Is September a good time to visit San Salvador?
- September in San Salvador: sweltering, soaked, with very humid — a fair time to visit. It ranks #11 of 12 months for San Salvador on SeasonMap's comfort score (54/100).
- What is the weather like in San Salvador in September?
- In September, San Salvador averages a daily high of 28.4°C and a low of 21.5°C, with about 278.7 mm of rain over roughly 28 rainy days.
- What is the air quality in San Salvador in September?
- San Salvador has a mean US Air Quality Index of about 51 in September.