San Juan del Sur (SJDS) weather in September
September in San Juan del Sur: sweltering, soaked, with clean air — fine if you can take 27 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#10 of 12 months in San Juan del Sur · #996 of 1413 destinations to visit in September · comfort 68/100 (tier C)
- Days
- 31°C
- Nights
- 25°C
- Wet days
- 27
- Sun
- 9.8 h
- Humidity
- 85%
- Daylight
- 12 h
Traveller notes on San Juan del Sur in September
San Juan del Sur's forum describes September and October as the heaviest rain of the year here, but the typical day still follows a manageable rhythm: cooler and overcast at dawn, clouds burning off by mid-morning, then sunny through the afternoon before rain returns. Posters said showers roll in roughly every other day and usually last only an hour or two rather than the whole day. A few forum regulars specifically preferred August over September, since the risk of a genuinely wet stretch climbs the closer you get to the end of the month.
Other months in San Juan del Sur
Forum posters describe March as squarely inside the strong seasonal wind window that runs January through March, with the ocean itself running noticeably cooler (around 17C) during the windiest stretch and beach days sometimes getting genuinely uncomfortable - one reviewer described wind strong enough to feel like it was 'beating' them while trying to lie on the beach. By March the pattern shifts toward hot, dry and dusty conditions on land even as the wind persists, with posters generally naming April (before or right after Easter week) or very early May as calmer, more comfortable alternatives for travelers who prioritize a still, sunny beach day over surf conditions - Papagayo-style offshore winds like this one are prized by kitesurfers even as they frustrate sunbathers.
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San Juan del Sur climate normals — September
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in San Juan del Sur 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.
BusyFiestas Patrias, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for San Juan del Sur'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 Juan del Sur's best weather comes in January, March and April — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in San Juan del Sur in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Southern swell season
1 Apr – 31 Oct · usuallySurf seasonThe consistent swell on this coast arrives with the southern hemisphere winter, so the best surf months are also the wet ones at Maderas and Remanso. The offshore wind that shapes it blows hardest in the dry season instead. Source ↗
- Nature
Arribadas at La Flor
1 Jul – 31 JanTurtle nestingBook earlyOlive ridleys come ashore at the La Flor refuge, twenty kilometres south, in mass arribadas that run about six days each and land between July and January. Rangers control access; September and October are the heaviest. Source ↗
- Holiday
Fiestas Patrias
14–15 SepNational holidayClosuresCrowded14 and 15 September are public holidays: school marching bands parade in every town, offices and banks close, and domestic travellers head for the lakes and the coast. Source ↗
- Season
Wet season
MonsoonRisk27 rainy days and about 252 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 Juan del Sur — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is San Juan del Sur?
San Juan del Sur in September — FAQ
- Is September a good time to visit San Juan del Sur?
- September in San Juan del Sur: sweltering, soaked, with clean air — fine if you can take 27 rainy days. It ranks #10 of 12 months for San Juan del Sur on SeasonMap's comfort score (68/100).
- What is the weather like in San Juan del Sur in September?
- In September, San Juan del Sur averages a daily high of 30.7°C and a low of 25.2°C, with about 252 mm of rain over roughly 27.4 rainy days.
- What is the air quality in San Juan del Sur in September?
- San Juan del Sur has a mean US Air Quality Index of about 26 in September.
Within 300 km: Nosara's Arribada at Ostional around 1 Jul – 31 Dec, and Jacó's Humpback whales around 15 Jul – 15 Nov.