San Felipe is located in a unique ecosystem, where the desert meets the sea. Temperatures range from a nocturnal winter low of 39°F to 114 °F in the shade during July and August.

The Bay of San Felipe is 12 feet above sea level. At low tide, the water can recede as much as 1 Mile. Temperatures in San Felipe average approximately 75°F year-round.http://sanfelipetoday.com/node/77/edit
Edit

The desert atmosphere limits rainfall in San Felipe to less than 5 inches a year. The town will often get the occasional windstorm which will stir up some dust and sand. Other than that, expect sunny skies and warm sunny beaches most of the year.

Average San Felipe Temperatures
70°F (January, February, March)
80°F (April, May, June)
95°F (July, August, September)
78°F (October, November, December)