La Fortuna weather in September
September in La Fortuna: hot, soaked, with clean air — a fair time to visit.
#9 of 12 months in La Fortuna · #535 of 604 destinations to visit in September · comfort 57/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
La Fortuna climate normals — September
| Daytime high | 28°C / 82°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 71°F | |
| Feels like (high) | 33°C / 91°F | |
| Rainfall | 281 mm / 11.1 in | ⛈ soaked |
| Rainy days | 28 days | |
| Humidity | 92% | 💦 very humid |
| Dew point | 22°C / 72°F | |
| Sunshine | 8.3 h/day | |
| Daylight | 12.2 h | |
| Wind | 9 km/h / 6 mph | |
| Air quality (US AQI) | 17 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is La Fortuna?
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La Fortuna in September — FAQ
- Is September a good time to visit La Fortuna?
- September in La Fortuna: hot, soaked, with clean air — a fair time to visit. It ranks #9 of 12 months for La Fortuna on SeasonMap's comfort score (57/100).
- What is the weather like in La Fortuna in September?
- In September, La Fortuna averages a daily high of 27.6°C and a low of 21.4°C, with about 281.1 mm of rain over roughly 28 rainy days.
- What is the air quality in La Fortuna in September?
- La Fortuna has a mean US Air Quality Index of about 17 in September.