Erice is situated in the north-west of Sicily, thousands of feet above Trapani. hence the temperature is considerably lower than on the coast. This can be very welcome in summer but in winter you can pay for superb views by being pretty cold, unless you wear considerably more than you might expect to in Sicily. Mist is frequent but tends to be short lived.
In summer there is a cable car from Trapani. In winter there is an enjoyable trip in a local bus. There are 2 roads - both long and twisty and drivable with care if you are a foreigner. Car parking is only charged June to September. Off season there is plenty of off and on-street parking. You should avoid entering the old city streets as they are very narrow and slippery when wet, though not largely out of bounds.
Without private transport any trip will have to start with the bus to Trapani.
You can hardly go wrong. Everything here is a delight; the streets, the shops, the park and above all the two Norman castles. Views are available towards the North and South coastlines, as well as inland.
Tourist souvenier shops. Cafes, cake and sweet shops. Local crafts.
Some really tasteful and welcoming small Italian cafes which serve food and drink. Great for coffee and Italian sweet cakes.