The month you would not want to be there

Apparent temperature — heat plus humidity — for every month in 7 Thai cities. Bangkok in May averages 36.6°C on a thermometer reading of 30.7°C.

Line chart of monthly feels-like temperature for seven Thai cities across the year

Apparent temperature, not air temperature: the same 30°C is a different month at 85% humidity. Shaded band is the US NWS caution threshold.

Download the chart (PNG) Download all 84 city-months (CSV)

What the chart says

16 of the 84 city-months sit at or above 35°C feels-like. The hottest is Bangkok in May at 36.6°C, against an air temperature of 30.7°C.
The year swings by at most 11.9°C. What changes between seasons is the rain — Chiang Rai takes 391 mm in August alone — not the heat.

All 84

Every city-month, hottest first.

#	City	Month	Feels like	Mean temp	Humidity	Rain	Cloud
1	Bangkok	May	36.6°C	30.7°C	74%	126 mm	77%
2	Pattaya	May	36.3°C	30.0°C	80%	146 mm	80%
3	Bangkok	April	36.2°C	30.6°C	73%	72 mm	52%
4	Hua Hin	May	36.2°C	30.1°C	77%	150 mm	81%
5	Hua Hin	April	36.0°C	30.3°C	72%	73 mm	55%
6	Chiang Mai	May	35.9°C	30.9°C	65%	82 mm	62%
7	Pattaya	April	35.8°C	29.8°C	79%	83 mm	55%
8	Khon Kaen	May	35.8°C	30.3°C	72%	138 mm	74%
9	Bangkok	June	35.6°C	30.2°C	74%	111 mm	87%
10	Pattaya	June	35.4°C	29.7°C	79%	128 mm	87%
11	Chiang Rai	June	35.3°C	28.9°C	82%	254 mm	90%
12	Khon Kaen	June	35.2°C	30.0°C	73%	130 mm	87%
13	Chiang Mai	June	35.1°C	29.7°C	73%	122 mm	89%
14	Khon Kaen	April	35.1°C	30.9°C	62%	46 mm	46%
15	Chiang Rai	May	35.0°C	29.2°C	77%	233 mm	63%
16	Chiang Rai	July	35.0°C	28.5°C	84%	343 mm	90%
17	Hua Hin	June	34.9°C	29.3°C	78%	112 mm	90%
18	Bangkok	March	34.8°C	29.6°C	75%	40 mm	41%
19	Bangkok	July	34.8°C	29.5°C	76%	150 mm	90%
20	Bangkok	August	34.8°C	29.5°C	76%	140 mm	91%
21	Bangkok	September	34.7°C	28.9°C	80%	249 mm	88%
22	Chiang Mai	July	34.7°C	29.0°C	77%	194 mm	91%
23	Pattaya	July	34.7°C	29.2°C	80%	175 mm	90%
24	Pattaya	August	34.7°C	29.2°C	80%	153 mm	90%
25	Chiang Rai	August	34.6°C	28.1°C	86%	391 mm	92%
26	Pattaya	March	34.5°C	29.0°C	80%	58 mm	45%
27	Pattaya	September	34.5°C	28.7°C	83%	258 mm	90%
28	Hua Hin	March	34.5°C	29.5°C	72%	43 mm	42%
29	Chiang Mai	April	34.4°C	30.7°C	57%	30 mm	31%
30	Chiang Rai	September	34.4°C	28.0°C	85%	276 mm	80%
31	Bangkok	October	34.3°C	28.5°C	81%	205 mm	79%
32	Chiang Mai	August	34.3°C	28.2°C	83%	245 mm	93%
33	Chiang Mai	September	34.3°C	28.1°C	84%	235 mm	84%
34	Khon Kaen	July	34.3°C	29.1°C	77%	229 mm	89%
35	Pattaya	October	34.2°C	28.3°C	83%	227 mm	83%
36	Khon Kaen	August	34.2°C	28.8°C	79%	177 mm	90%
37	Hua Hin	July	34.1°C	28.6°C	81%	183 mm	92%
38	Hua Hin	August	34.1°C	28.6°C	81%	138 mm	93%
39	Khon Kaen	September	34.1°C	28.2°C	83%	251 mm	81%
40	Hua Hin	September	34.0°C	28.2°C	83%	209 mm	92%
41	Hua Hin	October	33.8°C	27.8°C	85%	219 mm	84%
42	Phuket	April	33.2°C	28.3°C	79%	115 mm	74%
43	Phuket	May	33.1°C	28.3°C	81%	257 mm	86%
44	Chiang Rai	April	33.0°C	28.8°C	68%	118 mm	38%
45	Bangkok	November	32.9°C	28.2°C	75%	64 mm	65%
46	Chiang Mai	October	32.9°C	27.2°C	84%	155 mm	64%
47	Pattaya	November	32.9°C	28.1°C	78%	77 mm	69%
48	Khon Kaen	March	32.8°C	29.2°C	63%	27 mm	36%
49	Hua Hin	November	32.4°C	27.5°C	80%	78 mm	70%
50	Chiang Rai	October	32.3°C	26.8°C	84%	160 mm	61%
51	Khon Kaen	October	32.3°C	27.5°C	79%	133 mm	66%
52	Phuket	June	32.3°C	28.0°C	81%	243 mm	86%
53	Pattaya	February	32.2°C	27.7°C	76%	35 mm	39%
54	Phuket	March	32.2°C	28.1°C	76%	35 mm	58%
55	Bangkok	February	31.9°C	27.8°C	73%	21 mm	34%
56	Phuket	July	31.8°C	27.8°C	81%	262 mm	87%
57	Hua Hin	February	31.7°C	27.6°C	73%	24 mm	35%
58	Chiang Mai	March	31.3°C	28.5°C	57%	8 mm	20%
59	Phuket	August	31.3°C	27.6°C	82%	272 mm	86%
60	Phuket	October	31.2°C	27.0°C	83%	301 mm	88%
61	Phuket	November	31.1°C	27.0°C	82%	218 mm	86%
62	Pattaya	January	30.9°C	27.1°C	74%	32 mm	53%
63	Phuket	September	30.9°C	27.2°C	83%	345 mm	89%
64	Phuket	February	30.5°C	27.4°C	75%	24 mm	53%
65	Bangkok	January	30.3°C	26.7°C	72%	21 mm	49%
66	Pattaya	December	30.2°C	27.0°C	72%	23 mm	56%
67	Phuket	January	30.2°C	27.0°C	78%	76 mm	68%
68	Phuket	December	30.2°C	26.8°C	80%	102 mm	73%
69	Hua Hin	January	30.1°C	26.6°C	72%	40 mm	50%
70	Bangkok	December	30.0°C	26.8°C	70%	17 mm	52%
71	Chiang Mai	November	30.0°C	25.6°C	82%	23 mm	42%
72	Hua Hin	December	30.0°C	26.7°C	73%	20 mm	54%
73	Chiang Rai	March	29.8°C	27.0°C	63%	25 mm	25%
74	Khon Kaen	November	29.8°C	26.5°C	73%	29 mm	47%
75	Chiang Rai	November	29.0°C	24.8°C	83%	49 mm	44%
76	Khon Kaen	February	27.9°C	25.9°C	63%	12 mm	27%
77	Chiang Mai	February	26.8°C	24.9°C	63%	4 mm	18%
78	Chiang Mai	December	25.9°C	23.0°C	79%	9 mm	34%
79	Khon Kaen	January	25.8°C	24.3°C	66%	7 mm	38%
80	Khon Kaen	December	25.7°C	24.1°C	68%	4 mm	38%
81	Chiang Rai	February	25.2°C	23.3°C	69%	15 mm	23%
82	Chiang Mai	January	24.8°C	22.7°C	73%	13 mm	31%
83	Chiang Rai	December	24.6°C	22.0°C	81%	29 mm	37%
84	Chiang Rai	January	23.4°C	21.4°C	78%	41 mm	35%

Monthly means over 2015–2024. The hottest afternoon of any month runs well above its row.

Where this is wrong

A mean, not a maximum. A month averaging 36°C contains afternoons far above it. Nothing here is a record or a forecast.
Reanalysis on a ~9–11 km grid, sampled at the city centroid. A hill suburb and a beach 20 km apart share one row.
Feels-like is a model too. Apparent temperature combines heat, humidity and wind; different agencies compute it differently.

Sources

Open-Meteo / ECMWF ERA5 reanalysis

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