# When to visit Chiang Mai (and when to skip it)

> An honest guide to Chiang Mai's seasons: the cool-season sweet spot, the underrated green season, and the smoky months (March–April) to plan around.

People ask us this all the time: *when should I come?* The honest answer is that Chiang Mai is lovely for most of the year — but there's one season we'll gently steer you away from. So here's the straight version, from people who live here through all of it.

## The three seasons

**Cool & dry (≈ November–February) — the sweet spot.** Blue skies, low humidity, days around **15–28°C** and cool evenings. This is peak season for good reason: perfect for café-hopping, scooter rides and mountain trips. It's busier and a little pricier, but it's the easiest time to fall in love with the place.

**Green & rainy (≈ June–October) — underrated.** Don't let "rainy" put you off. The rain usually comes in **short, dramatic afternoon bursts**, with sun on either side — plenty of dry hours to work and explore. In exchange you get **lush green hills, waterfalls at full flow, fewer crowds and lower prices**. For a long stay, it's our quiet favourite (just keep your plans flexible in August–September, the wettest stretch).

**Hot (≈ March–May).** Daytimes climb to **35°C+**, especially in April. Manageable with early mornings and lazy afternoons — but this season overlaps with the one thing you really should know about.

![When to visit Chiang Mai (and when to skip it)](/blog/when-to-visit-chiang-mai/visual.webp)

## The one thing to know: the smoke

We'd rather be honest than lose your trust. Roughly **late February through April**, Northern Thailand has its **burning season** — farmers clear fields with fire, and the whole valley fills with **PM2.5 haze**. In the worst weeks (usually **March and April**), Chiang Mai regularly ranks among the most polluted cities in the world.

If you're sensitive to air quality, asthmatic, or just protective of your lungs, we'd genuinely suggest **planning your stay around March and April**. If you do come then: pick a place with **air purifiers**, wear an **N95/KN95** outdoors on bad days, and check the daily AQI before heading up a mountain. Plenty of locals simply decamp to the islands for those few weeks — it's completely normal.

## Timing the festivals

Two are worth planning around:

- **[Yi Peng & Loy Krathong](/blog/yi-peng-lantern-festival)** — the lantern festival, around **November**, right in the lovely cool season. The best possible time to be here.
- **Songkran** (Thai New Year) — **13–15 April**, the famous city-wide water fight. Enormous fun — but it lands squarely in the hot, smoky window, so come knowing the trade-off.

## So, when should you come?

- **For the best weather and clear air:** November to February.
- **For green, cheap and peaceful:** June to early October.
- **The months to plan around:** March and April (heat + smoke).

A pattern that works beautifully for long stays: **arrive in late October or November and leave before March**, or **come for the green season** and watch the hills turn emerald. Either way, once you've picked your month, our [settling-in guide](/blog/settling-in-chiang-mai) will get you sorted in your first few days. Pick well and Chiang Mai will be very good to you.