San Diego weather in August
August in San Diego: hot, dry, with very humid — one of the best months to visit.
#1 of 12 months in San Diego · #61 of 604 destinations to visit in August · comfort 91/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
San Diego climate normals — August
| Daytime high | 26°C / 79°F | 🥵 hot |
|---|---|---|
| Nighttime low | 19°C / 66°F | |
| Feels like (high) | 29°C / 84°F | |
| Rainfall | 7 mm / 0.3 in | ☀️ dry |
| Rainy days | 0 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 18°C / 64°F | |
| Sunshine | 12.1 h/day | |
| Daylight | 13.3 h | |
| Wind | 15 km/h / 10 mph | |
| Air quality (US AQI) | 51 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San Diego in August — FAQ
- Is August a good time to visit San Diego?
- August in San Diego: hot, dry, with very humid — one of the best months to visit. It ranks #1 of 12 months for San Diego on SeasonMap's comfort score (91/100).
- What is the weather like in San Diego in August?
- In August, San Diego averages a daily high of 26°C and a low of 18.8°C, with about 6.8 mm of rain over roughly 0.4 rainy days.
- What is the air quality in San Diego in August?
- San Diego has a mean US Air Quality Index of about 51 in August.