Valparaíso weather in September
September in Valparaíso: cool, dry, with clean air — an excellent time to visit.
#8 of 12 months in Valparaíso · #208 of 604 destinations to visit in September · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Valparaíso climate normals — September
| Daytime high | 14°C / 58°F | 🙂 cool |
|---|---|---|
| Nighttime low | 10°C / 50°F | |
| Feels like (high) | 13°C / 55°F | |
| Rainfall | 15 mm / 0.6 in | ☀️ dry |
| Rainy days | 1 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 10°C / 49°F | |
| Sunshine | 10.2 h/day | |
| Daylight | 11.9 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Valparaíso?
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Valparaíso in September — FAQ
- Is September a good time to visit Valparaíso?
- September in Valparaíso: cool, dry, with clean air — an excellent time to visit. It ranks #8 of 12 months for Valparaíso on SeasonMap's comfort score (85/100).
- What is the weather like in Valparaíso in September?
- In September, Valparaíso averages a daily high of 14.2°C and a low of 10.1°C, with about 15 mm of rain over roughly 1.2 rainy days.
- What is the air quality in Valparaíso in September?
- Valparaíso has a mean US Air Quality Index of about 38 in September.