San Juan weather in October
October in San Juan: sweltering, rainy, with clean air — a good time to visit.
#11 of 12 months in San Juan · #517 of 604 destinations to visit in October · comfort 62/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
San Juan climate normals — October
| Daytime high | 31°C / 87°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 76°F | |
| Feels like (high) | 36°C / 97°F | |
| Rainfall | 126 mm / 4.9 in | 🌧 rainy |
| Rainy days | 19 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 10 h/day | |
| Daylight | 11.7 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 31 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San Juan in October — FAQ
- Is October a good time to visit San Juan?
- October in San Juan: sweltering, rainy, with clean air — a good time to visit. It ranks #11 of 12 months for San Juan on SeasonMap's comfort score (62/100).
- What is the weather like in San Juan in October?
- In October, San Juan averages a daily high of 30.6°C and a low of 24.6°C, with about 125.5 mm of rain over roughly 19.2 rainy days.
- What is the air quality in San Juan in October?
- San Juan has a mean US Air Quality Index of about 31 in October.