california has ALWAYS been hot (well for the last 8-10 thousand years)
you note the heat, because you are watching for it, but this heat is not unusual.
i remember back in the late 70's when i first came to california, (during the ice age scare) and it was BALLS HOT, even though i came from Utah, which was (ithought) also balls hot in summer, but is also bitter cold in winter.
the commonly repeated myth of "Dem Storms" is not a result of more powerful storms or more of them, just MORE REPORTING on them, and more people on the coast in regions subject to hurricanes.
Storms, unlike earthquakes do not have a Richter Scale, and as such are subject to estimations of their power based on the damage they do rather than the actual force they apply.
katrina was not that bad a hurricane(cat 3 at landfall), but it happened to hit a weak spot, and thus dealt Maximum Damage.
katrina was only a cat 5 (and thus the sixth most powerful hurricane in history) for a short time in the gulf, where it spent it's fury on the sea, by the time it hit land it was a fairly common storm
take a look at the hurricane history:
http://www.nhc.noaa.gov/outreach/history/
it is periodic, random, and NOT increasing in frequency.
the constant repetition of the Katrina fallderall makes it seem like it is happening all over again, every couple of months.
after katrina, it was 8 years before another hurricane struck, but it feels like it's happening all the time because you are constantly reminded that it is HAPPENING ALL THE TIME (even when it is clearly not).
the sun drives the weather, but the need for dramatic stories drives the press.