Bangkok Weather in December: How Warm Are the Evenings, Really?

How warm is Bangkok in the evening in December?

The median reading between 7:00 and 10:59 PM in December is 28°C, the same as in November, January and February. The table below is our own count of the Iowa Environmental Mesonet archive of Suvarnabhumi Airport (station VTBS) observations from 2015 to 2025, which is 11 years, read in Bangkok time.

December and January are the two months in which a cooler evening is most likely, and even then roughly nine readings in ten sit at 25°C or above. The coolest December evening readings in the archive were 18°C, two of them, at 10:30 PM on 19 and 20 December 2017; no other December evening reading in eleven years was below 19°C.

How we counted

We downloaded the half-hourly and hourly observations for station VTBS from the Iowa Environmental Mesonet for 1 January 2015 to 31 December 2025, converted to Asia/Bangkok time, and kept readings stamped 19:00 to 22:59. That is 2,629 readings in November, 2,724 in December, 2,710 in January and 2,473 in February. Temperatures are reported in whole degrees Celsius. A rain or thunder evening is a date with at least one reading in that window whose present-weather code contains RA or TS (rain, or thunderstorm including nearby thunderstorm). The denominator is the dates with any reading in the window: 330, 341, 341 and 311.

Three limits matter. Suvarnabhumi is an airport about 25 km east of central Bangkok, so central Bangkok, with more concrete, can run a little warmer at night. An airport report of rain does not mean it rained on Soi Langsuan. And eleven years is a sample, not a forecast.

What does the official forecast say for winter 2026 to 2027?

The Thai Meteorological Department (TMD) expects a milder cool season than last year, starting about a week later than usual, with Bangkok lows of 19 to 21°C. As reported by The Star on 15 October 2026, upper Thailand enters the cool season in the third week of October, about a week later than usual, and it lasts until around mid-February 2027, with the coolest stretch from late December to early February. The report adds that El Niño may strengthen toward the end of 2026, which could keep temperatures above normal.

A forecast low is a pre-dawn number. It does not contradict the 7 to 11 PM median above, because Bangkok's evening is still the warm part of the day. The yearbook definition is in the National Statistical Office, Statistical Yearbook Thailand 2024.

When does the sun set in Bangkok in December?

Sunset in Bangkok is about 5:48 PM on 24 November and about 5:50 PM through the first half of December, drifting to about 6:00 PM by 31 December. We computed these from the standard solar position formulas for central Bangkok and checked 24 November against sunrisesunset.io, which gives about 5:47 PM. Treat any single time as accurate to a minute or two.

The practical result is that a 6:00 PM table is a twilight table. Dinner at 7:30 PM is entirely after dark, and the street is still at 28°C.

What should you wear to dinner in Bangkok in December?

Wear what you would wear to a warm summer evening, and carry one light layer for the air conditioning. The data supports light fabrics: only about one reading in fifteen is at 24°C or below in December. Rooms in Bangkok are air conditioned, and the temperature difference between the street and the dining room is what most people notice, not the weather itself. That last point is our observation, not a measured figure.

At Bisou the dress code is smart casual, with no flip-flops. A shirt or a light dress and a thin jacket or wrap in the bag covers every December evening in the archive except the rare cold one.

Does it rain in Bangkok in December evenings?

Rarely: 13 of 341 December evenings in the archive, or 3.8 percent, carry a rain or thunderstorm report. November is the contrast, at 15.5 percent of evenings. January is the driest at 1.8 percent. For a December table you can plan around the street rather than around an umbrella.

Does Bisou have a terrace?

Yes: Bisou Bangkok has an upstairs terrace and a smoking corner downstairs, alongside the main dining room, bar and kiss wall, and December evenings are rarely held back by weather. Ask the team when you reserve what suits your evening. We do not publish a terrace reservation rule, so we do not promise one.

Which festive nights should you plan around?

Christmas and the end of the year are the December nights with their own guides. Loy Krathong, on Tuesday 24 November 2026, comes just before December: see our Loy Krathong guide. For the festive evenings, see Christmas dinner at Bisou and New Year's Eve dinner at Bisou. For after the main course, our guide to late-night restaurants in Bangkok ranks the kitchens by last food order, not closing time.

Dinner at Bisou in a Bangkok December

Bisou Bangkok is a modern French restaurant at 68 Soi Langsuan 9, Lumphini, Pathum Wan, Bangkok 10330, two minutes from BTS Chit Lom, serving dinner nightly from 5:30 PM to 1:00 AM with the last food order at midnight.

• Menu: Chef Antoine Darquin's modern French cooking, plated to share. The signature five-course chef's sharing menu is THB 3,400 per person for two guests or more, which is THB 4,002 on the bill after the 10 percent service charge and 7 percent VAT. A la carte averages about THB 3,000 per person. See the menu.
• Recognition: MICHELIN Guide Thailand Selected in 2025 and 2026. The inspectors write: "Bisou delivers sexy simplicity through modern French cuisine, prioritising premium ingredients."
• Getting there: BTS Chit Lom is two minutes away; BTS Ratchadamri and BTS Ploenchit are also close. Complimentary valet parking is available.
• Booking and walk-ins: reserve a table online or call +66 96 025 5858. Walk-ins are accepted when there is room, and a booking is better, especially on Friday and Saturday.

For the neighbourhood around the restaurant, see where to eat on Soi Langsuan and the best restaurants near Lumphini Park. For who we are, start with the Bisou Bangkok guide.