SeasonMapSan Juan del Sur (SJDS) weather in September
Nicaragua
September in San Juan del Sur: sweltering, soaked, with clean air — fine if you can take 27 rainy days.
#10 of 12 months in San Juan del Sur · #977 of 1383 destinations to visit in September · comfort 68/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on San Juan del Sur in September
No notes yet. Open San Juan del Sur on the map to add the first one.
San Juan del Sur climate normals — September
| Daytime high | 31°C / 87°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Feels like (high) | 37°C / 99°F | |
| Sea temperature | 30°C / 86°F | ♨️ bath-warm |
| Rainfall | 252 mm / 9.9 in | ⛈ soaked |
| Rainy days | 27 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 25°C / 76°F | |
| Sunshine | 9.8 h/day | |
| Daylight | 12.2 h | |
| Wind | 20 km/h / 13 mph | |
| Air quality (US AQI) | 26 | 🍃 good |
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.
Quietschool holidays in 2 of the markets that fill it, one of its worst months for weather(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 ↗
- 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.
Other months in San Juan del Sur
Compare San Juan del Sur in September
Warmer or cooler than San Juan del Sur in September
Similar destinations in Central America — September
Within 300 km: Nosara's Arribada at Ostional around 1 Jul – 31 Dec, and Jacó's Humpback whales around 15 Jul – 15 Nov.