Been in October about 6 or 7 times and bar the odd poor day and the odd chilly night the weather has been fine.

A couple of times we've been and its been perfect, 22/23C and very sunny all day so its lovely to sunbathe without feeling too hot but then due to the clear skies its got quite cold at night.

Last year in October we had daytime highs of 25-28C and it didn't get cold at night like it had done in previous years.
At 11PM one night we were sat outside La Cantina having a meal and the digital clock thing next to the taxis in San Antonio was showing 25C.

we too have been in october and the weather has been gorgeous without the feeling of it being too hot....last october was lovely but have been when have had a couple of odd days of cloud but nothing to stop your holiday. great for kids at that time of year.