How accurately could you predict water temperature for a specific location on the california coast

The californian coast is also called as the golden coast, referring to the Western coastal region of USA.

Explanation:

Climate influenced by the east to west direction of the prevalence of the California cold current, and the microclimates due to the hills and coastal ranges. Having a stronger temperature in summers and milder winters, and occasionally heat waves. However, the coastal region in the mid-summer is warmer in south and east and is cooler in the northern zones,  hence the water temperatures of this zone are cooler i.e just 11 degrees in summers.