Hanoi shows a fairly mild monthly swing: sample heat runs higher around Oct–Dec, softer around Jul–Sep (monthly sample means about 1.1–1.3). Tết and coastal holiday road-trippers lift heat. Index ≈ each hotel’s off-peak baseline—not a live city-wide rate.
January
1 public holidaysFebruary
1 public holidaysMarch
No public holidays this month1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
April
2 public holidaysMay
1 public holidays · 2 FestivalJune
No public holidays this month1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
July
No public holidays this month1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
271.3
281.6
291.5
301.4
31
August
1 public holidaysSeptember
1 public holidays · 1 FestivalOctober
No public holidays this month11.3
2
3
4
51.3
61.3
71.3
81.4
9
10
11
121.3
13
14
15
16
17
18
191.3
201.3
211.5
221.4
231.6
241.8
251.6
261.4
271.3
281.3
291.3
30
311.4
November
No public holidays this month1
21.5
31.8
41.9
51.3
6
7
8
91.7
101.9
111.3
12
13
14
15
161.4
171.5
181.4
191.3
20
21
221.6
231.6
241.4
251.7
261.4
27
28
29
301.4
December
No public holidays this month11.3
21.3
31.6
4
5
6
71.3
8
9
10
11
12
13
141.3
15
16
171.3
18
19
20
211.3
221.4
231.6
241.4
251.3
261.4
271.3
281.4
291.4
301.4
311.5
Index ≈ 1.0 is each hotel’s sample off-peak baseline; shown when >1.2. Sampled reference, not live city-wide rates