Climate almanac
San José
Alajuela Province, Costa Rica · 10.95°, -85.14°
What is the weather like in San José in September?
In September, San José is typically 81°F (27°C) during the day and 75°F (24°C) at night. The month brings about 9.9 in (253 mm) of precipitation in total.
- Average high81°F (27°C)
- Average low75°F (24°C)
- Precipitation9.9 in (253 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)