Ayutthaya weather in December
December in Ayutthaya: sweltering, dry — one of the best months to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#1 of 12 months in Ayutthaya · #442 of 1413 destinations to visit in December · comfort 80/100 (tier A)
- Days
- 32°C
- Nights
- 21°C
- Wet days
- 3
- Sun
- 9.7 h
- Humidity
- 59%
- Daylight
- 11 h
Traveller notes on Ayutthaya in December
Forum posters describe December as highly predictable and among the most pleasant months across central Thailand generally, with hot daytime temperatures (commonly reaching into the low 30sC), clear skies and minimal rain, while evenings cool into the low-20s or even high-teensC - genuinely comfortable by regional standards. This makes December squarely inside Thailand's cool, dry high season, good conditions for exploring Ayutthaya's outdoor temple ruins on foot without the wet-season rain risk. The clear tradeoff posters note for the broader region this time of year: December is also peak tourist season, so popular sites and accommodations get busy and should be booked ahead.
Other months in Ayutthaya
Thailand's forum is consistent that June sits in a relative lull between the wetter bookends of May and September - it's still hot and humid nationwide, and Ayutthaya specifically gets called out as brutal around midday, but the rain itself is usually a shower rather than an all-day event. Forum regulars who visited Ayutthaya in June had a genuinely good time, describing it as hot and humid with manageable showers rather than a washout. The advice that comes up again and again is to tour the temple ruins early in the morning and save the hottest hours for indoor breaks.
Add your own note from Ayutthaya's card on the map.
Ayutthaya climate normals — December
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Ayutthaya in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdstravelers describe it as peak season, Cool, dry season, Ayutthaya World Heritage Fair
Sourced from traveler notes: “…for the broader region this time of year: December is also peak tourist season, so popular sites and accommodations get busy and should be…” — Tripadvisor community
Peak crowdsBusyShoulder seasonQuiet
Best months for Ayutthaya's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherAyutthaya's weather peaks December–February.
December includes Ayutthaya World Heritage Fair.
Best weatherFair weatherToughest weather
What's on in Ayutthaya in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Cool, dry season
15 Nov – 20 Feb · usuallyCrowdedThe months the ruins are worth a full day: firm ground on the island, cycling between the wats before the heat, and light that arrives low over the brick.
- Festival
Ayutthaya World Heritage Fair
10–23 Dec · usuallyMajor festivalCrowdedTen evenings of light-and-sound staged in the historical park to mark the UNESCO listing, with the ruins lit and a night market through the middle of town. Source ↗
Nearby, and something's on
Within 300 km of Ayutthaya — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Ayutthaya?
Ayutthaya in December — FAQ
- Is December a good time to visit Ayutthaya?
- December in Ayutthaya: sweltering, dry — one of the best months to visit. It ranks #1 of 12 months for Ayutthaya on SeasonMap's comfort score (80/100).
- What is the weather like in Ayutthaya in December?
- In December, Ayutthaya averages a daily high of 32°C and a low of 21.4°C, with about 12.6 mm of rain over roughly 2.8 rainy days.
- What is the air quality in Ayutthaya in December?
- Ayutthaya has a mean US Air Quality Index of about 64 in December.
Within 300 km: Pattaya's Gulf dry season around 1 Nov – 30 Apr, and Bangkok's Dry days on Buddhist holy days on 1 Jan – 31 Dec.