Monthly Weather Summary

In March 2026, the weather in upper Thailand remained cool in the morning in the first half of the month, with cold weather in some areas of the northern region. This was due to the influence of high-pressure areas from China extended its ridge to cover the northeastern region and the South China Sea. Meanwhile, daytime temperature increased in several areas of upper Thailand, especially in the second half of the month when generally hot weather was found with very hot weather in many areas. This was caused by the persisted of heat-low pressure cell over upper Thailand, along with the prevailing southerly and southeasterly winds during that period. Rainfall in upper Thailand occurred on a few days along with reports of thundershower, gusty wind and hail in many areas. These conditions were influence by the easterly and southeasterly winds and the passage of the westerly trough through the northern region. In southern region, rainfall was less, with most rain was found in the first half of the month due to the prevailing of the easterly and southeasterly winds over the Gulf of Thailand, southern Thailand, and the Andaman Sea. After that, wind weakening resulted in isolated rain on some days. Monthly rainfall was below normal in all regions i.e. northern part 11.8 mm (36%), northeastern part 28.1 mm (62%), central part 20.9 mm (50%), eastern part 23.4 mm (35%), southern part (east coast) 59.6 mm (69%) and southern part (west coast 61.9 mm (60%). Overall, the average total rainfall across Thailand was 30.2 mm (54%) below normal. Mean temperature of March were close to normal and slightly above normal in most areas with the average monthly temperature of 0.4° C above normal. Further details are as follows.