Air Masses and Weather Patterns

San Diego and Southern California in general are impacted primarily by maritime tropical(mT), and continental tropical(cT). Wintertime in San Diego is generally cool and wet which means that during this time of year the area is mostly affected by maritime tropical air masses accounting for most of the precipitation received throughout the year. On the other hand summers are much different with warm and dry conditions which can be attributed to the predominately continental tropical air masses with occasional maritime tropical air masses bringing some summertime precipitation. Mid-Lattitude cyclones do affect San Diego with primarily warm, cold, and warm occluded fronts. when it comes to occluded fronts the warm type is only seen on the west coast of North America including San Diego. Current conditions show that a weak cold front has recently passed by not affecting temperatures too much as the a San Diego is experiencing a seasonal high of around 60 degrees for today and even warmer in the days to come.

source:http://www.weather.com/maps/maptype/currentweatherusnational/uscurrentweather_large.html

One weather feature unique to San Diego and Southern California is the "June gloom" this is generally characterized by a thick marine layer that is present mainly along the coast while it sometimes ventures inland. This is due to warm moist air masses moving over the cool ocean currents which causes an inversion and in turn forming a "lid" in the atmosphere trapping these low lying clouds. Generally this inversion is lifted in the afternoon as the sun heats up the atmosphere. This can put a damper on your hopes of enjoying a nice sunny day at the beach so plan you vacation accordingly!

source:http://weathersandiego.blogspot.com/b/post-preview?token=Bt87hjYBAAA.g8qfHXhcy2_n_AnElkAs9w.IYoqJ7sHWz0Hwv8RmxnrEA&postId=8608715569712052574&type=POST

Typical "June gloom" as you can see it generally hugs the coast.

source:http://gocalifornia.about.com/od/calamenu/ig/Manhattan-Beach-Pictures/June-Gloom.htm

This is what you can come to expect in June along the coast.