San Salvador weather in September
September in San Salvador: sweltering, soaked, with muggy air — a gamble, with 29 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#11 of 12 months in San Salvador · #1240 of 1413 destinations to visit in September · comfort 53/100 (tier D)
- Days
- 30°C
- Nights
- 21°C
- Wet days
- 29
- Sun
- 9.5 h
- Humidity
- 87%
- Daylight
- 12 h
Traveller notes on San Salvador in September
Other months in San Salvador
Forum posters describe El Salvador's rainy season, running roughly May through November, as bringing humid conditions with rain that typically falls in the late evening or overnight rather than disrupting the daytime. Posters are consistent that at worst a visit sees a couple of hours of evening rain, with days themselves staying at minimum dry, often sunny and pleasant. Posters do note that November through April or May generally draws praise as the better overall weather window for an El Salvador trip. Posters generally rate June as warm, humid and genuinely rain-affected for San Salvador, but with the rain concentrated enough in the evenings that daytime plans typically go untouched.
Forum posters describe December as one of the nicest months to visit El Salvador - the rainy season has ended by this point, but the countryside stays lush and green, and temperatures run genuinely pleasant. Posters generally name November as the start of the dry season here, with excellent weather building through the following months, positioning December squarely within that favorable stretch. Given the limited detailed trip reports specific to San Salvador the city, this broader country-level dry-season framing - green scenery without the rain, comfortably warm days - is the most useful guide available for a December visit.
Add your own note from San Salvador's card on the map.
San Salvador climate normals — September
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in San Salvador in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyIndependence Day, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for San Salvador's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherSan Salvador's weather peaks December–February, best around January.
Best weatherFair weatherToughest weather
What's on in San Salvador in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Surf season on the Bálsamo coast
15 Mar – 31 Oct · usuallySouthern swells run for most of the year on the point breaks at Sunzal, El Tunco and Punta Roca, forty-five minutes from the capital down the Litoral. It is the reason a lot of people are in San Salvador at all.
- Holiday
Independence Day
14–15 SepNational holidayClosuresCrowdedTorch relays come into the capital on the evening of the fourteenth and the school bands and drum corps take the Alameda the next morning. Everything closes for the day. Source ↗
- Season
Wet season
MonsoonRisk29 rainy days and about 293 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Nearby, and something's on
Within 300 km of San Salvador — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is San Salvador?
San Salvador in September — FAQ
- Is September a good time to visit San Salvador?
- September in San Salvador: sweltering, soaked, with muggy air — a gamble, with 29 rainy days. It ranks #11 of 12 months for San Salvador on SeasonMap's comfort score (53/100).
- What is the weather like in San Salvador in September?
- In September, San Salvador averages a daily high of 29.8°C and a low of 20.9°C, with about 292.7 mm of rain over roughly 29.1 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.
Within 300 km: Antigua Guatemala's Independence Day on 14–15 Sep, and Lake Atitlán's Independence Day on 14–15 Sep.