Too cold in Spain in October??

Hello,


Just need some advice, I was planning to get married in August but it doesn’t look like that’s happening now. I am happy to push back to October but I just wonder if it might be a bit too chilly in the evenings in that month. It would be around Madrid. We were planning to have outdoor dining, and so anything less than 20C might be too cold.
Does anyone have any experience with this? I already looked up weather online for this time of year but it gives a range 11-20C. Not sure if that is reliable…I could also potentially do on a Spanish island like Mallorca which would probably be a little warmer. Please help!