Originally Posted by
noglider
And don't talk to us about weather in San Diego.

Haha, indeed.
I have this thinnish long-sleeve Novara fleece jersey which I found out works for me from 50 up to 80 (have to roll up sleeves and take it a bit slower at the higher end). 50 and above I just do shorts, below 50 I wear a pair of longjohns under the shorts and a thin poly or wool/poly long-sleeve on my torso and that'll be good down to 40. The base layers take up barely any room on the way back.
What's much more troublesome is those days with 35-degree mornings and 65-degree afternoons... theeen I have to don my pants and jacket and lug it all back.