This is the length of your stay determines the choice of your visa.
ATMs are very numerous in Pattaya, you can make withdrawals are within the limit of your bank authorization.
In the tourism sector, there are many exchange offices, euros are accepted without any problems.
The most cool and dry period is from November to early March, temperatures are mild and the rare rains, temperatures can even go down to 20, 22 °, but generally it is around 25-30 °.
The hottest period is in April, May and the wettest October in September, but has nothing to do with the Indian monsoon, usually this is limited to a big storm in the late afternoon.
The temperature of the sea water is between 27 and 30 degrees.
If you plan to rent a motorbike or a car, the International license is required, not to lease the car because the landlord will ask you surely not the passport is enough for him, but if you have any problems, international licenses not avoid lot of trouble, already the assurance level.
Driving a vehicle in Thailand is not a major problem, except that we drive on the left, and that the conduct of Thais is sometimes disconcerting.
Thailand is a safe country, certainly safer than many European countries.
In addition, there are in Pattaya, a special police, the Tourist Police, whose agents speak English, they will assist you in case of problems.