Everything is open in October. Malta is very heavily populated and Sliema is a main residential and touristic location. It's far quieter than Summer but far from dead.
People Also Ask
Many people wonder for Malta how many days are actually needed and the perfect answer can be 4 days. You can dedicate a day to each of the major places/cities and learn about Malta's culture, history, and of course, food!
The hottest place in Europe in October is Tenerife in the Canary Islands (Spain), with an average temperature of 68°-79°F (20°-26°C). October is actually the best time to visit the Canary Islands, as you'll avoid the high season crowds of November to March, and temperatures are not unbearably hot like in the summer.