Climate almanac
Santiago
San José, Costa Rica · 9.85°, -84.31°
What is the weather like in Santiago in September?
In September, Santiago is typically 78°F (25°C) during the day and 66°F (19°C) at night. The month brings about 30 in (764 mm) of precipitation in total.
- Average high78°F (25°C)
- Average low66°F (19°C)
- Precipitation30 in (764 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)