San José weather in May
May in San José: warm, soaked, with clean air — a gamble, with 27 rainy days.
#12 of 12 months in San José · #815 of 897 destinations to visit in May · comfort 61/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on San José in May
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San José climate normals — May
| Daytime high | 25°C / 77°F | 🌤 warm |
|---|---|---|
| Nighttime low | 19°C / 66°F | |
| Rainfall | 329 mm / 13 in | ⛈ soaked |
| Rainy days | 27 days | |
| Humidity | 88% | 💦 very humid |
| Dew point | 19°C / 66°F | |
| Sunshine | 7.9 h/day | |
| Daylight | 12.6 h | |
| Wind | 7 km/h / 4 mph | |
| Air quality (US AQI) | 45 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San José in May — FAQ
- Is May a good time to visit San José?
- May in San José: warm, soaked, with clean air — a gamble, with 27 rainy days. It ranks #12 of 12 months for San José on SeasonMap's comfort score (61/100).
- What is the weather like in San José in May?
- In May, San José averages a daily high of 25.1°C and a low of 18.9°C, with about 329.2 mm of rain over roughly 26.8 rainy days.
- What is the air quality in San José in May?
- San José has a mean US Air Quality Index of about 45 in May.