San José weather in August
August in San José: warm, soaked, with clean air — a gamble, with 28 rainy days.
#10 of 12 months in San José · #724 of 897 destinations to visit in August · comfort 63/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on San José in August
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San José climate normals — August
| Daytime high | 24°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 19°C / 65°F | |
| Rainfall | 373 mm / 14.7 in | ⛈ soaked |
| Rainy days | 28 days | |
| Humidity | 91% | 💦 very humid |
| Dew point | 19°C / 67°F | |
| Sunshine | 7.8 h/day | |
| Daylight | 12.4 h | |
| Wind | 7 km/h / 5 mph | |
| Air quality (US AQI) | 33 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San José in August — FAQ
- Is August a good time to visit San José?
- August in San José: warm, soaked, with clean air — a gamble, with 28 rainy days. It ranks #10 of 12 months for San José on SeasonMap's comfort score (63/100).
- What is the weather like in San José in August?
- In August, San José averages a daily high of 24.4°C and a low of 18.5°C, with about 372.9 mm of rain over roughly 27.8 rainy days.
- What is the air quality in San José in August?
- San José has a mean US Air Quality Index of about 33 in August.