The month you would not want to be there

Apparent temperature — heat plus humidity — for every month in 17 Thai cities. Sukhothai in May averages 37.6°C on a thermometer reading of 32.0°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 204 city-months (CSV)

What the chart says

36 of the 204 city-months sit at or above 35°C feels-like. The hottest is Sukhothai in May at 37.6°C, against an air temperature of 32.0°C.
The year swings by at most 11.9°C. What changes between seasons is the rain — Hat Yai takes 420 mm in November alone — not the heat.

All 204

Every city-month, hottest first.

#	City	Month	Feels like	Mean temp	Humidity	Rain	Cloud
1	Sukhothai	May	37.6°C	32.0°C	66%	173 mm	70%
2	Sukhothai	April	37.1°C	32.8°C	56%	60 mm	38%
3	Bangkok	May	36.6°C	30.7°C	74%	126 mm	77%
4	Ayutthaya	May	36.6°C	30.9°C	73%	136 mm	77%
5	Ayutthaya	April	36.4°C	31.0°C	70%	68 mm	52%
6	Kanchanaburi	May	36.4°C	31.0°C	69%	109 mm	77%
7	Pattaya	May	36.3°C	30.0°C	80%	146 mm	80%
8	Kanchanaburi	April	36.3°C	31.4°C	64%	52 mm	50%
9	Sukhothai	June	36.3°C	30.6°C	73%	166 mm	89%
10	Bangkok	April	36.2°C	30.6°C	73%	72 mm	52%
11	Hua Hin	May	36.2°C	30.1°C	77%	150 mm	81%
12	Hua Hin	April	36.0°C	30.3°C	72%	73 mm	55%
13	Chiang Mai	May	35.9°C	30.9°C	65%	82 mm	62%
14	Pattaya	April	35.8°C	29.8°C	79%	83 mm	55%
15	Khon Kaen	May	35.8°C	30.3°C	72%	138 mm	74%
16	Udon Thani	May	35.8°C	30.2°C	72%	160 mm	73%
17	Sukhothai	September	35.7°C	29.3°C	81%	255 mm	83%
18	Udon Thani	June	35.7°C	29.7°C	77%	179 mm	89%
19	Bangkok	June	35.6°C	30.2°C	74%	111 mm	87%
20	Sukhothai	July	35.6°C	29.9°C	75%	209 mm	91%
21	Ayutthaya	June	35.5°C	30.3°C	73%	128 mm	87%
22	Pattaya	June	35.4°C	29.7°C	79%	128 mm	87%
23	Nakhon Ratchasima	May	35.4°C	29.8°C	74%	131 mm	77%
24	Chiang Rai	June	35.3°C	28.9°C	82%	254 mm	90%
25	Sukhothai	August	35.3°C	29.4°C	79%	242 mm	92%
26	Hat Yai	May	35.3°C	28.9°C	82%	165 mm	85%
27	Khon Kaen	June	35.2°C	30.0°C	73%	130 mm	87%
28	Chiang Mai	June	35.1°C	29.7°C	73%	122 mm	89%
29	Khon Kaen	April	35.1°C	30.9°C	62%	46 mm	46%
30	Krabi	April	35.1°C	28.8°C	84%	174 mm	75%
31	Sukhothai	October	35.1°C	28.8°C	82%	172 mm	65%
32	Chiang Rai	May	35.0°C	29.2°C	77%	233 mm	63%
33	Chiang Rai	July	35.0°C	28.5°C	84%	343 mm	90%
34	Ayutthaya	March	35.0°C	29.9°C	72%	45 mm	44%
35	Nakhon Ratchasima	April	35.0°C	30.4°C	66%	68 mm	50%
36	Hat Yai	April	35.0°C	29.0°C	79%	119 mm	75%
37	Hua Hin	June	34.9°C	29.3°C	78%	112 mm	90%
38	Krabi	May	34.9°C	28.4°C	86%	288 mm	87%
39	Kanchanaburi	June	34.9°C	29.8°C	73%	117 mm	88%
40	Udon Thani	July	34.9°C	29.0°C	80%	281 mm	89%
41	Bangkok	March	34.8°C	29.6°C	75%	40 mm	41%
42	Bangkok	July	34.8°C	29.5°C	76%	150 mm	90%
43	Bangkok	August	34.8°C	29.5°C	76%	140 mm	91%
44	Bangkok	September	34.7°C	28.9°C	80%	249 mm	88%
45	Chiang Mai	July	34.7°C	29.0°C	77%	194 mm	91%
46	Pattaya	July	34.7°C	29.2°C	80%	175 mm	90%
47	Pattaya	August	34.7°C	29.2°C	80%	153 mm	90%
48	Ayutthaya	July	34.7°C	29.6°C	75%	161 mm	91%
49	Kanchanaburi	March	34.7°C	30.3°C	64%	35 mm	39%
50	Sukhothai	March	34.7°C	30.9°C	58%	24 mm	28%
51	Udon Thani	April	34.7°C	30.5°C	62%	44 mm	44%
52	Chiang Rai	August	34.6°C	28.1°C	86%	391 mm	92%
53	Ayutthaya	August	34.6°C	29.5°C	76%	171 mm	91%
54	Ayutthaya	September	34.6°C	28.9°C	81%	271 mm	88%
55	Udon Thani	August	34.6°C	28.5°C	83%	309 mm	91%
56	Nakhon Ratchasima	June	34.6°C	29.7°C	73%	123 mm	87%
57	Pattaya	March	34.5°C	29.0°C	80%	58 mm	45%
58	Pattaya	September	34.5°C	28.7°C	83%	258 mm	90%
59	Hua Hin	March	34.5°C	29.5°C	72%	43 mm	42%
60	Hat Yai	June	34.5°C	28.6°C	82%	109 mm	84%
61	Chiang Mai	April	34.4°C	30.7°C	57%	30 mm	31%
62	Chiang Rai	September	34.4°C	28.0°C	85%	276 mm	80%
63	Udon Thani	September	34.4°C	28.3°C	83%	271 mm	80%
64	Bangkok	October	34.3°C	28.5°C	81%	205 mm	79%
65	Chiang Mai	August	34.3°C	28.2°C	83%	245 mm	93%
66	Chiang Mai	September	34.3°C	28.1°C	84%	235 mm	84%
67	Khon Kaen	July	34.3°C	29.1°C	77%	229 mm	89%
68	Pattaya	October	34.2°C	28.3°C	83%	227 mm	83%
69	Khon Kaen	August	34.2°C	28.8°C	79%	177 mm	90%
70	Krabi	June	34.2°C	28.1°C	86%	248 mm	87%
71	Ayutthaya	October	34.2°C	28.6°C	80%	173 mm	77%
72	Kanchanaburi	September	34.2°C	28.8°C	78%	182 mm	88%
73	Pai	May	34.2°C	28.9°C	76%	175 mm	63%
74	Hat Yai	July	34.2°C	28.5°C	81%	114 mm	86%
75	Hua Hin	July	34.1°C	28.6°C	81%	183 mm	92%
76	Hua Hin	August	34.1°C	28.6°C	81%	138 mm	93%
77	Khon Kaen	September	34.1°C	28.2°C	83%	251 mm	81%
78	Kanchanaburi	July	34.1°C	29.1°C	75%	125 mm	91%
79	Hua Hin	September	34.0°C	28.2°C	83%	209 mm	92%
80	Kanchanaburi	August	34.0°C	29.0°C	76%	125 mm	92%
81	Krabi	March	33.9°C	28.6°C	78%	59 mm	60%
82	Hat Yai	August	33.9°C	28.4°C	81%	131 mm	84%
83	Hua Hin	October	33.8°C	27.8°C	85%	219 mm	84%
84	Krabi	July	33.7°C	27.9°C	87%	278 mm	88%
85	Kanchanaburi	October	33.6°C	28.1°C	81%	181 mm	79%
86	Hat Yai	October	33.6°C	27.6°C	85%	251 mm	90%
87	Pai	June	33.5°C	27.7°C	84%	241 mm	91%
88	Nakhon Ratchasima	March	33.5°C	29.4°C	65%	37 mm	41%
89	Nakhon Ratchasima	July	33.5°C	28.8°C	76%	174 mm	90%
90	Nakhon Ratchasima	August	33.5°C	28.7°C	77%	162 mm	91%
91	Hat Yai	September	33.5°C	27.9°C	83%	160 mm	88%
92	Krabi	August	33.4°C	27.7°C	87%	276 mm	87%
93	Nakhon Ratchasima	September	33.4°C	27.9°C	83%	241 mm	87%
94	Hat Yai	March	33.3°C	28.3°C	78%	55 mm	61%
95	Phuket	April	33.2°C	28.3°C	79%	115 mm	74%
96	Krabi	October	33.2°C	27.4°C	88%	356 mm	89%
97	Phuket	May	33.1°C	28.3°C	81%	257 mm	86%
98	Sukhothai	November	33.1°C	27.9°C	77%	24 mm	43%
99	Pai	July	33.1°C	27.3°C	86%	282 mm	93%
100	Chiang Rai	April	33.0°C	28.8°C	68%	118 mm	38%
101	Krabi	September	33.0°C	27.4°C	88%	334 mm	90%
102	Pai	September	33.0°C	27.0°C	87%	232 mm	87%
103	Bangkok	November	32.9°C	28.2°C	75%	64 mm	65%
104	Chiang Mai	October	32.9°C	27.2°C	84%	155 mm	64%
105	Pattaya	November	32.9°C	28.1°C	78%	77 mm	69%
106	Khon Kaen	March	32.8°C	29.2°C	63%	27 mm	36%
107	Krabi	November	32.8°C	27.1°C	88%	303 mm	88%
108	Ayutthaya	November	32.8°C	28.6°C	71%	51 mm	61%
109	Pai	April	32.8°C	29.1°C	63%	56 mm	32%
110	Pai	August	32.8°C	27.0°C	87%	324 mm	95%
111	Hat Yai	November	32.8°C	27.0°C	88%	420 mm	90%
112	Hua Hin	November	32.4°C	27.5°C	80%	78 mm	70%
113	Udon Thani	October	32.4°C	27.5°C	78%	106 mm	61%
114	Chiang Rai	October	32.3°C	26.8°C	84%	160 mm	61%
115	Khon Kaen	October	32.3°C	27.5°C	79%	133 mm	66%
116	Phuket	June	32.3°C	28.0°C	81%	243 mm	86%
117	Pattaya	February	32.2°C	27.7°C	76%	35 mm	39%
118	Phuket	March	32.2°C	28.1°C	76%	35 mm	58%
119	Krabi	February	32.2°C	28.0°C	76%	30 mm	56%
120	Nakhon Ratchasima	October	32.2°C	27.3°C	80%	146 mm	75%
121	Krabi	January	32.0°C	27.4°C	81%	88 mm	71%
122	Krabi	December	32.0°C	27.1°C	84%	145 mm	77%
123	Kanchanaburi	November	32.0°C	27.7°C	74%	57 mm	64%
124	Udon Thani	March	32.0°C	28.4°C	65%	30 mm	34%
125	Bangkok	February	31.9°C	27.8°C	73%	21 mm	34%
126	Hat Yai	December	31.9°C	26.9°C	86%	306 mm	83%
127	Phuket	July	31.8°C	27.8°C	81%	262 mm	87%
128	Ayutthaya	February	31.8°C	28.0°C	70%	18 mm	36%
129	Hua Hin	February	31.7°C	27.6°C	73%	24 mm	35%
130	Hat Yai	February	31.7°C	27.5°C	79%	58 mm	60%
131	Pai	October	31.6°C	26.2°C	86%	138 mm	70%
132	Hat Yai	January	31.6°C	27.1°C	83%	115 mm	75%
133	Chiang Mai	March	31.3°C	28.5°C	57%	8 mm	20%
134	Phuket	August	31.3°C	27.6°C	82%	272 mm	86%
135	Kanchanaburi	February	31.3°C	28.0°C	64%	17 mm	33%
136	Phuket	October	31.2°C	27.0°C	83%	301 mm	88%
137	Phuket	November	31.1°C	27.0°C	82%	218 mm	86%
138	Pattaya	January	30.9°C	27.1°C	74%	32 mm	53%
139	Phuket	September	30.9°C	27.2°C	83%	345 mm	89%
140	Phuket	February	30.5°C	27.4°C	75%	24 mm	53%
141	Bangkok	January	30.3°C	26.7°C	72%	21 mm	49%
142	Sukhothai	February	30.3°C	27.3°C	65%	20 mm	21%
143	Pattaya	December	30.2°C	27.0°C	72%	23 mm	56%
144	Phuket	January	30.2°C	27.0°C	78%	76 mm	68%
145	Phuket	December	30.2°C	26.8°C	80%	102 mm	73%
146	Hua Hin	January	30.1°C	26.6°C	72%	40 mm	50%
147	Bangkok	December	30.0°C	26.8°C	70%	17 mm	52%
148	Chiang Mai	November	30.0°C	25.6°C	82%	23 mm	42%
149	Hua Hin	December	30.0°C	26.7°C	73%	20 mm	54%
150	Ayutthaya	January	30.0°C	26.9°C	68%	15 mm	49%
151	Nakhon Ratchasima	November	30.0°C	26.6°C	74%	32 mm	60%
152	Chiang Rai	March	29.8°C	27.0°C	63%	25 mm	25%
153	Khon Kaen	November	29.8°C	26.5°C	73%	29 mm	47%
154	Ayutthaya	December	29.7°C	27.2°C	64%	12 mm	50%
155	Udon Thani	November	29.6°C	26.2°C	72%	17 mm	39%
156	Pai	March	29.5°C	27.2°C	59%	13 mm	21%
157	Kanchanaburi	January	29.3°C	26.5°C	66%	14 mm	47%
158	Koh Samui	May	29.1°C	25.9°C	79%	118 mm	80%
159	Kanchanaburi	December	29.1°C	26.6°C	66%	8 mm	51%
160	Sukhothai	December	29.1°C	25.7°C	74%	15 mm	34%
161	Chiang Rai	November	29.0°C	24.8°C	83%	49 mm	44%
162	Pai	November	29.0°C	24.7°C	84%	43 mm	49%
163	Nakhon Ratchasima	February	28.9°C	26.5°C	64%	9 mm	32%
164	Koh Samui	April	28.7°C	25.7°C	79%	109 mm	61%
165	Koh Phangan	May	28.7°C	25.8°C	79%	148 mm	80%
166	Koh Phangan	April	28.5°C	25.5°C	78%	107 mm	60%
167	Sukhothai	January	28.4°C	25.4°C	71%	26 mm	34%
168	Koh Samui	June	28.1°C	25.6°C	77%	78 mm	87%
169	Khon Kaen	February	27.9°C	25.9°C	63%	12 mm	27%
170	Koh Phangan	June	27.6°C	25.5°C	78%	111 mm	87%
171	Koh Samui	July	27.4°C	25.3°C	79%	94 mm	88%
172	Koh Samui	August	27.2°C	25.2°C	78%	76 mm	87%
173	Koh Samui	March	27.1°C	24.9°C	78%	30 mm	48%
174	Koh Phangan	March	27.0°C	24.7°C	78%	31 mm	47%
175	Koh Samui	October	26.9°C	24.4°C	82%	251 mm	86%
176	Koh Phangan	July	26.9°C	25.1°C	79%	126 mm	89%
177	Chiang Mai	February	26.8°C	24.9°C	63%	4 mm	18%
178	Koh Samui	September	26.8°C	24.8°C	80%	155 mm	89%
179	Udon Thani	February	26.8°C	25.0°C	65%	16 mm	25%
180	Nakhon Ratchasima	January	26.7°C	24.9°C	67%	7 mm	44%
181	Koh Phangan	August	26.6°C	25.0°C	79%	110 mm	87%
182	Koh Phangan	October	26.5°C	24.2°C	82%	270 mm	86%
183	Koh Samui	November	26.4°C	24.2°C	82%	320 mm	81%
184	Nakhon Ratchasima	December	26.4°C	24.8°C	68%	6 mm	48%
185	Koh Phangan	September	26.3°C	24.6°C	80%	198 mm	89%
186	Koh Phangan	November	26.1°C	24.2°C	81%	301 mm	80%
187	Chiang Mai	December	25.9°C	23.0°C	79%	9 mm	34%
188	Khon Kaen	January	25.8°C	24.3°C	66%	7 mm	38%
189	Khon Kaen	December	25.7°C	24.1°C	68%	4 mm	38%
190	Koh Samui	February	25.5°C	24.1°C	77%	41 mm	47%
191	Koh Samui	January	25.4°C	23.9°C	78%	101 mm	63%
192	Koh Samui	December	25.4°C	24.0°C	79%	228 mm	70%
193	Koh Phangan	February	25.4°C	24.0°C	77%	39 mm	45%
194	Chiang Rai	February	25.2°C	23.3°C	69%	15 mm	23%
195	Koh Phangan	January	25.1°C	23.8°C	78%	100 mm	61%
196	Pai	February	25.1°C	23.5°C	66%	9 mm	19%
197	Pai	December	25.1°C	22.3°C	82%	16 mm	38%
198	Koh Phangan	December	25.0°C	23.9°C	78%	209 mm	69%
199	Udon Thani	January	24.9°C	23.4°C	68%	9 mm	35%
200	Udon Thani	December	24.9°C	23.4°C	68%	3 mm	32%
201	Chiang Mai	January	24.8°C	22.7°C	73%	13 mm	31%
202	Chiang Rai	December	24.6°C	22.0°C	81%	29 mm	37%
203	Pai	January	23.8°C	21.7°C	76%	28 mm	34%
204	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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Data updated 4 September 2026