Chiang Mai in May: what to expect

May is the hinge month in northern Thailand. The hot season is still running — expect 35 °C afternoons and nights that stay near 24 °C — but the southwest monsoon starts to push in, usually as short, heavy showers in the late afternoon or evening rather than all-day rain. Early May is mostly dry and hot; by the last week, showers are more frequent and the air is noticeably more humid.

The upside is the sky. The burning season that blights Chiang Mai from February to April is over, so haze clears and the hills turn green again. The trade-off is that cloud and rain can hide the views from Doi Suthep and Doi Inthanon on any given day.

This is a month to plan around the heat rather than the rain: temples, markets and cafés in the morning and late afternoon, a pool or air-conditioned break at midday.

May sits in the low season for the north. Guesthouses, boutique hotels and cooking schools that are full in December have space, and walk-in rates are often below what you would pay online. Flights from Bangkok are cheap outside the long weekends.

The exceptions are Thai public holidays and the Visakha Bucha long weekend, when domestic travellers fill Chiang Mai for a few days. Book those dates ahead; otherwise you can decide on the day.

The main fixed point is Visakha Bucha, which falls on the full moon of the sixth lunar month — late May or early June, so check the exact date for your year. It marks the Buddha's birth, enlightenment and passing. Temples such as Wat Phra That Doi Suthep hold candlelit processions in the evening, and alcohol sales are banned nationwide for the day.

Beyond that, May is a quiet month for festivals in Chiang Mai. Royal ploughing and other national ceremonies happen in Bangkok, not here. Expect ordinary markets, night bazaar evenings and temple fairs rather than large events.

Work with the heat. Doi Suthep and Wat Phra That Doi Suthep are best at opening time, before the sun and the tour buses arrive. The old city's temples — Wat Chedi Luang, Wat Phra Singh — are shaded and walkable in the morning.

For a full day out, Doi Inthanon is cooler than the city by several degrees, but cloud can close the view; go early and treat the summit as a bonus rather than a guarantee. Waterfalls such as Mae Sa and Bua Tong (the sticky waterfall) are at their best once the first rains have topped them up.

Indoor and shaded options earn their place in May: cooking classes, the night bazaar, Nimman cafés, and Thai massage. If you want guaranteed dry weather, fly south — the Gulf islands of Samui, Phangan and Tao are in their dry season through September.

Light, loose clothing in breathable fabrics, plus a compact umbrella or rain shell for the late-afternoon showers. Sunscreen, a hat and a refillable water bottle matter more here than in the cool season. Temples need shoulders and knees covered, so carry a light layer for that.

If you are sensitive to smoke or dust, pack a mask for the residual haze early in the month and check the AQI each morning.

April is hotter and hazier but ends with Songkran, the nationwide water festival. June brings the monsoon properly: more rain, greener hills, still cheap. July is similar, with heavier downpours and the start of Buddhist Lent.

If dry, cool weather is what you want, aim for November to February — but book early, because that is when everyone else comes too.