Thailand's Weather — What Australians Actually Think When They Get There

Yes, It's Hot

Thailand is hot. If you're from Brisbane or Darwin you'll adjust reasonably well. If you're from Melbourne or Tasmania, the first few months will be a genuine physical adjustment.

Average temperatures sit between 28–35°C for much of the year. In the hot season (March–May), Bangkok regularly hits 38–40°C with high humidity.

The Three Seasons

Cool season (November–February) — The best time to be in most of Thailand. Temperatures drop to 20–30°C in central and northern regions. In Chiang Mai you might even need a light layer in the evenings. This is peak tourist season for good reason.

Hot season (March–May) — The hardest stretch. March and April are the two genuinely brutal months. Songkran (Thai New Year) falls in mid-April — a massive water festival that makes the heat slightly more bearable.

Rainy season (June–October) — Typically heavy downpours in the afternoon or evening, with clear mornings. Temperatures are slightly lower than hot season. Accommodation is cheaper and tourist crowds disappear.

Regional Differences Matter

Northern Thailand (Chiang Mai): Best climate overall. The cool season genuinely feels cool. Downside: burning season from February to April, when air quality can become seriously poor.

Gulf Coast (Hua Hin): Gentler climate than Bangkok — cooled by the Gulf breeze.

Northeast Thailand (Khon Kaen): More extreme seasons — hotter in hot season, cooler in cool season. Some Australians find this more comfortable because it feels like a proper summer/winter contrast.

The Practical Upshot

Most Australians from Queensland or the Northern Territory adapt within a month or two. Australians from cooler southern states typically find the first hot season genuinely challenging — but by the second year it's much more manageable.