The Weather In Pattaya:
In Pattaya the weather is very pleasant all year around. From November till April is the dry season with minimal rains closer to the end of this period. In May we have a small monsoon. In June and July the weather is nice and warm with minimal rainfalls. From August till October the rainy season is present.
The air and water temperature during the entire year is around 30°C. In winter time (mid Nov – mid Feb) the air temperatures are a little lower. What is important to you, that during this period the swimming pool is colder too, so make sure you do have adequate exposure protection.
The most actual data you can find by clicking here.