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 holidays41.4
51.3
61.5
72.0
81.8
92.1
102.3
112.2
121.9
131.6
141.5
15
16
17
181.4
191.3
201.4
211.3
22
23
24
251.4
261.3
27
28
29
30
31
February
1 public holidaysMarch
No public holidays this month11.4
21.4
31.4
4
51.3
61.4
7
81.5
91.4
101.4
11
121.3
13
14
151.5
161.5
17
181.5
191.3
201.3
21
221.5
231.4
241.4
251.4
261.3
271.3
28
291.5
301.4
311.5
April
2 public holidays11.4
21.3
3
4
51.4
61.4
7
81.3
91.3
10
11
121.4
131.3
14
151.3
17
18
191.4
201.4
211.4
221.4
231.3
24
25
261.4
271.4
28
29
May
1 public holidays · 2 Festival41.3
5
61.3
7
81.3
9
101.4
11
121.4
131.3
15
16
171.4
181.3
201.3
211.3
221.3
23
241.5
251.3
26
271.3
28
29
30
311.5
June
No public holidays this month1
21.3
31.3
4
51.3
6
71.4
8
91.3
101.3
11
12
13
141.4
15
16
171.3
18
19
20
211.4
22
23
241.3
25
26
27
281.5
291.4
30
July
No public holidays this month11.4
2
3
4
51.5
61.4
7
81.4
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
August
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
September
1 public holidays · 1 FestivalOctober
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
November
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
December
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
Index ≈ 1.0 is each hotel’s sample off-peak baseline; shown when >1.2. Sampled reference, not live city-wide rates