Normally, the average daily temperature in California in the course of September is 19. Highs are expected to be 27 and low of 14. We have provided a clearer breakdown here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 19 |
| High Temperature | 27 |
| Low Temperature | 14 |
| Sunshine Per Day | 9 |
Useful Links: California Weather: Average Weather & Yearly Climate