At the beginning of this summer season, high pressure air masses from
China still prevail to cover over Northern and Northeastern parts from time to
time causing the area still to be cool generally in the morning and cold in
some areas on some days. During daytime, the upper Thailand will be hot
generally.
Until about middle March until April, heat low pressure air masses
covering the upper Thailand (Northern, Northeastern, Central and Eastern parts) from time to time cause the area to be
hot generally and very hot in many areas especially during late March until early April. However, some southerly and
southeasterly winds and sometimes some westerly air waves prevailing to cover over the upper Thailand cause the
area to have thunderstorms and reducing some heat.
About at the end of this summer season (about at the first half of May), weather will be variable. The upper
Thailand’s weather will swelter generally and very hot in some areas. Some thunderstorms happen and reduce some
heat.