San Diego weather in May
May in San Diego: nice, dry, with clean air — an excellent time to visit.
#6 of 12 months in San Diego · #210 of 604 destinations to visit in May · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
San Diego climate normals — May
| Daytime high | 20°C / 68°F | 😎 nice |
|---|---|---|
| Nighttime low | 14°C / 57°F | |
| Feels like (high) | 20°C / 68°F | |
| Rainfall | 13 mm / 0.5 in | ☀️ dry |
| Rainy days | 4 days | |
| Humidity | 74% | 💧 humid |
| Dew point | 11°C / 52°F | |
| Sunshine | 12.1 h/day | |
| Daylight | 13.8 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 49 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San Diego in May — FAQ
- Is May a good time to visit San Diego?
- May in San Diego: nice, dry, with clean air — an excellent time to visit. It ranks #6 of 12 months for San Diego on SeasonMap's comfort score (85/100).
- What is the weather like in San Diego in May?
- In May, San Diego averages a daily high of 20°C and a low of 13.8°C, with about 12.6 mm of rain over roughly 3.6 rainy days.
- What is the air quality in San Diego in May?
- San Diego has a mean US Air Quality Index of about 49 in May.