Emilios' plants look like the Aloe vera I am familiar with. Be aware that there is another aloe sometimes called Aloe vera chinensis which is now considered a form of Aloe officinalis (which usually has orange or coral flowers instead of yellow ones). Both Arabian aloes have medicinal properties but they are distinct botanical forms (and neither is Chinese in origin, despite what the name might suggest). Perhaps this explains the difference, Ken?
I cannot explain the spots and stripes on those aloes. New healthy leaves are a good sign that the plant will simply outgrow them. I wouldn't worry about it. Aloe vera (the true form, with yellow flowers and unspotted adults) is a very tough plant and actually pretty hard to kill in good light.
Our climate is similar (winter rainfall, summer drought, regular fog and humidity) but significantly milder in temperature (we get up to maybe 30-32°C). Aloe vera will usually turn grayish brown during the summer and shrink up significantly in response to drought, then recover quite fast when it rains again. Those changes are really only cosmetic and not something to worry about. I water the plants here every couple of weeks but that's probably more than they need in our climate.
I've never seen spider mites here. I am told they do not tolerate our high humidity. On the other hand, aloe mites (which we unfortunately do have around here) cause a totally different kind of disease which is manifested by disordered growth, wart-like tissue, and distorted flowers. They are not the cause of the spots you are seeing on your plants.
