San José weather in December
December in San José: warm, rainy, with clean air — an excellent time to visit.
#4 of 12 months in San José · #201 of 897 destinations to visit in December · comfort 84/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on San José in December
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San José climate normals — December
| Daytime high | 25°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 17°C / 63°F | |
| Rainfall | 128 mm / 5 in | 🌧 rainy |
| Rainy days | 15 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 17°C / 62°F | |
| Sunshine | 9.6 h/day | |
| Daylight | 11.6 h | |
| Wind | 11 km/h / 7 mph | |
| Air quality (US AQI) | 26 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San José in December — FAQ
- Is December a good time to visit San José?
- December in San José: warm, rainy, with clean air — an excellent time to visit. It ranks #4 of 12 months for San José on SeasonMap's comfort score (84/100).
- What is the weather like in San José in December?
- In December, San José averages a daily high of 24.5°C and a low of 17.4°C, with about 127.7 mm of rain over roughly 15.4 rainy days.
- What is the air quality in San José in December?
- San José has a mean US Air Quality Index of about 26 in December.