Some cold days between December and February in the region of 8 or 9 degrees celcius. June and September are probably the best months to visit with an average of 30 degrees. Mid-July and August can be too hot so if you are not ready for temperatures of 36 degrees..... In the spring, the weather is quite warm and balmy, requiring a t-shirt with a cardigan tied round your waist, the afternoons are quite hot but late evenings are quite chilly requiring a light jacket or jumper.  For sightseeing, this temperature is better as you can do a lot more walking about which is very invigorating with the sea breeze and you can see a lot more in comparison with a hot July holiday where the heat is nearly unbearable. Temperatures in late March are 19 - 17 degrees with quite strong sea breeze which can cool things down a little.