The average daily temperature in San Diego in the time of May is 16. Average highs are typically 21 degrees celsius and a low of 15 celsius. The table below includes more detail:
| Month | Degrees Celsius |
|---|---|
| Temperature | 16 |
| High Temperature | 21 |
| Low Temperature | 15 |
| Sunshine Per Day | 9 |
Useful Links: San Diego Weather: Average Weather & Yearly Climate