Budapest and Hungary generally distinguishes the four seasons of the year: from October to March are the coldest months were December, January and February have the lowest temperatures. During the spring, from, March to early June, the season's more pleasant with balmy temperatures; the same happens between September and October. The warmest months are between late June and September.
Hungarian Forint (HUF). In Hungary there are many exchange houses because there is a strong competition in this sector, so it's easier to manage. It's better to change money in the city than at the airport, and if you want to cover the first expenses of the journey, try to bring some Hungarian Forints in your pocket before starting your trip. To change money in the city try to go to a specialized place, don't agree to change money on the street because probably they who offer you the deal will take the upper hand. Fees are not very high in Hungary, though it's advisable to pay attention to the calculation that you will receive. Paying with credit card usually doesn't have added commissions but it all depends on the charges your bank applies. The Euro and American dollars are accepted in some places but it's not very common.