Benidorm is indeed often compared to the "Spanish Las Vegas" because of the large number of nightclubs, casinos and entertainment that are offered there for tourists.
The phrase I see used the most is "Blackpool in the sun" lol... I've been to Benidorm tonnes of times and it's definitely closer to being Blackpool than it is New York or Las Vegas!
It depends on how lucky you are. You never know but I would assure that if you stay around 5-6 days you can probably enjoy at least a couple of them of sunny days
Здесь даже на Новый Год нередко бывает +25. Можно загорать и многие купаются. Прохладные февраль и март. Из-за ветра. Днём 14-15, ночью ниже 7-8 не бывает. Но зато цветет миндаль, мандарины, апельсины. Такой аромат! Много зелени, сосновые леса и горы. Город великолепный