What local dishes should I try in Thailand, and where should I look for them?

The 2024 inscription of Tomyum Kung on UNESCO's Representative List puts a hot-and-sour river-prawn soup on the same official footing as Thailand's dance dramas. It joins five other Thai elements: Kebaya in 2024, Songkran in 2023, Nora in 2021, Nuad Thai in 2019 and Khon in 2018. The practical point for a visitor is that the dish is national rather than regional — the designation recognizes a cooking tradition found across the country, so you are not obliged to be anywhere in particular to eat it well.

Most other Thai cooking is regional, and the differences are sharp. The northeast, Isan, runs to grilled meats, sticky rice, som tam green papaya salad and fermented fish seasoning. The north around Chiang Mai has khao soi, a curried noodle soup with Burmese and Yunnanese ancestry, and its own sausages. The central plain produces the dishes most travelers already know — pad thai, green and red curries, massaman. The south is the hottest and most coconut-heavy, with gaeng tai pla and fish curries.

Where to look is largely a weather question. Street-level cooking in Bangkok happens on pavements and in open-fronted shophouses, and the city's rainfall normals swing from 325.6 mm across 21.1 rainy days in September to 43.5 mm across 5.8 days in November. In the wet months the stalls still trade but the seating does not, which pushes you toward covered markets and shophouse restaurants rather than kerbside tables.

A Thai street kitchen is a single wok over a high-pressure burner, with the prepped ingredients in steel trays along the front edge and the cooking done in under two minutes a plate. The sound is the burner, and the smell is fish sauce and chili hitting hot oil.

Songkran, in mid-April, includes feasting among the practices UNESCO lists, alongside the water pouring and the folk plays — which makes the festival one of the few fixed points in the year when regional home cooking is served publicly rather than only in restaurants. It is also the hottest stretch of the Thai year, so the cold dishes and the fruit are at their best.

• Morning — Rice soup or noodles from a market stall, before the day's heat.
• Afternoon — A covered market, which keeps trading when the rain arrives.
• Evening — Shophouse restaurants and night markets, where the regional specialties get cooked to order.

Thailand is listed among the destinations named in the CDC's Global Measles travel health notice, Level 1, Practice Usual Precautions, dated 28 May 2025 — worth settling before a trip built around crowded markets. October is the awkward month for street eating: a 244.2 mm rainfall normal across 17.5 rainy days, late enough in the year that visitors assume the wet season has ended. Heat is its own constraint in April, when the hot season peaks and outdoor cooking fires make a busy market genuinely uncomfortable by mid-afternoon.

The when-to-visit question in this group gives Bangkok's month-by-month rainfall and temperature normals, which is what determines whether pavement eating is practical.