The most popular time to visit is the cool season from November to February. It’s usually dry and sunny with temperatures up to 30 C in the afternoon. Mornings and nights in December and January, especially around the end of the year, can get pretty cold (10-15 C), especially on the back of a motorbike, so bringing some warmer clothes is a good idea.
The hot season is from March to June, and from mid February to March the city can become very smoky and polluted as farmers in the surrounding area burn their fields. This is probably the worst time to be in the city and many expats try to head down to the islands or abroad.
The rainy season is from July to October. The end of October can be a great time of year as everything is green, the sky is clear, and there are less tourists. It’s also a good time to arrive to find an apartment before the high season starts.