How many sunny days does Hanoi have per year?

Hanoi averages approximately 121 sunny days per year, based on historical climate data.

What is the air quality in Hanoi?

Hanoi has an annual PM2.5 concentration of 35.4 µg/m³, classified as "Unhealthy" by WHO standards. Far exceeds WHO targets. Respiratory and cardiovascular effects likely.

Hanoi

Hanoi · Vietnam

The capital of Vietnam.

Photo by Minh Luu (Minhluu.com & AA+Photography) on Unsplash

Large city

5.0M

925 km²

05:25 UTC+7

VND

Explore on map →Climate twin →

Hanoi sees only 121 sunny days a year — overcast skies are common. Summers are intensely hot — air conditioning is essential. On the other hand, air quality is a concern.

Hanoi, Vietnam is a 5M-resident city with 121 sunny days and 0 frost days annually and an annual PM2.5 of 35.4 µg/m³. The capital of Vietnam.

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Climate

Feels-like °C

Dinner outside

Climate Lab · Hanoi

Monthly climate metrics across temperature, precipitation, wind, and UV.

Metric	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Temperature
Daily high°C	23	25	28	30	34	36	35	34	33	31	29	23	30
Daily mean°C	19	21	23	26	30	32	31	30	29	24	25	19	26
Daily low°C	13	15	19	21	26	28	28	27	26	21	19	14	21
Thermal comfort
High feelsDaily high feels-like°C	27	29	33	36	41	41	41	40	39	35	34	27	35
Mean feelsDaily mean feels-like°C	18	21	24	28	33	35	35	34	32	23	25	19	27
Low feelsDaily low feels-like°C	7	12	17	21	27	29	29	29	26	16	16	8	20
Humidity
HumidityRelative humidity%	80	81	82	82	76	73	73	81	82	73	73	70	77
Dewpoint°C	15.0	16.8	20.3	23.2	25.4	25.9	26.3	26.4	25.2	20.4	18.6	12.2	21.3
Precipitation
Rainfallmm	22	31	44	114	204	169	200	318	240	85	23	12	1461
Rain days≥1mm	3	8	8	12	15	16	21	25	23	11	4	3	149
Wind
Wind avgm/s	2.0	2.1	2.4	2.6	2.2	2.1	2.0	1.6	1.8	2.1	1.9	2.0	2.1
Wind gustsm/s	4.1	4.0	4.4	4.6	4.3	3.7	3.9	3.0	3.3	4.7	3.9	4.0	4.0
Sun & UV
Sunshinehrs/day	3.6	3.0	3.5	5.4	9.3	9.0	9.6	8.0	7.5	5.0	7.6	5.0	6.4
Clear skyindex	14%	18%	17%	27%	29%	24%	33%	24%	28%	28%	43%	34%	27%
UV indexmax avg	2.7	2.6	2.8	3.6	6.6	7.7	8.1	7.0	6.4	6.0	5.2	3.4	5.2

Based on 2014–2024 hourly climate data · Updated Mar 2025

Confidence: High

Lifestyle Calendar · Hanoi

Outdoor living in Hanoi is seasonal. January through February are perfect for all activities, while May through September shut things down. Dinner outside works 6/12 months, while walking works 7/12 months.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Annual

6/12

Dinner Outside

66Jan: 66% viability

75Feb: 75% viability

82Mar: 82% viability

65Apr: 65% viability

46May: 46% viability

38Jun: 38% viability

37Jul: 37% viability

36Aug: 36% viability

39Sep: 39% viability

74Oct: 74% viability

85Nov: 85% viability

57Dec: 57% viability

6/12

Dinner Outside

66Jan: 66% viability

75Feb: 75% viability

82Mar: 82% viability

65Apr: 65% viability

46May: 46% viability

38Jun: 38% viability

37Jul: 37% viability

36Aug: 36% viability

39Sep: 39% viability

74Oct: 74% viability

85Nov: 85% viability

57Dec: 57% viability

58%

Humid

3/12

Lunch Outside

80Jan: 80% viability

71Feb: 71% viability

54Mar: 54% viability

34Apr: 34% viability

16May: 16% viability

10Jun: 10% viability

8Jul: 8% viability

8Aug: 8% viability

10Sep: 10% viability

42Oct: 42% viability

63Nov: 63% viability

88Dec: 88% viability

3/12

Lunch Outside

80Jan: 80% viability

71Feb: 71% viability

54Mar: 54% viability

34Apr: 34% viability

16May: 16% viability

10Jun: 10% viability

8Jul: 8% viability

8Aug: 8% viability

10Sep: 10% viability

42Oct: 42% viability

63Nov: 63% viability

88Dec: 88% viability

40%

Humid

7/12

Walking

99Jan: 99% viability

98Feb: 98% viability

88Mar: 88% viability

66Apr: 66% viability

31May: 31% viability

12Jun: 12% viability

10Jul: 10% viability

20Aug: 20% viability

37Sep: 37% viability

76Oct: 76% viability

89Nov: 89% viability

100Dec: 100% viability

100

7/12

Walking

99Jan: 99% viability

98Feb: 98% viability

88Mar: 88% viability

66Apr: 66% viability

31May: 31% viability

12Jun: 12% viability

10Jul: 10% viability

20Aug: 20% viability

37Sep: 37% viability

76Oct: 76% viability

89Nov: 89% viability

100Dec: 100% viability

100

61%

Humid

3/12

Running

94Jan: 94% viability

83Feb: 83% viability

58Mar: 58% viability

26Apr: 26% viability

7May: 7% viability

0Jun: 0% viability

0Jul: 0% viability

1Aug: 1% viability

9Sep: 9% viability

42Oct: 42% viability

44Nov: 44% viability

89Dec: 89% viability

3/12

Running

94Jan: 94% viability

83Feb: 83% viability

58Mar: 58% viability

26Apr: 26% viability

7May: 7% viability

0Jun: 0% viability

0Jul: 0% viability

1Aug: 1% viability

9Sep: 9% viability

42Oct: 42% viability

44Nov: 44% viability

89Dec: 89% viability

38%

Humid

Tap any month for details · Click activity name for overview

ComfortableModerateUncomfortable

Based on 2014–2024 hourly climate data · Updated Mar 2025

Confidence: High

Climate

Feels-like °C

Dinner outside

Climate Lab · Hanoi

Monthly climate metrics across temperature, precipitation, wind, and UV.

Metric	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Temperature
Daily high°C	23	25	28	30	34	36	35	34	33	31	29	23	30
Daily mean°C	19	21	23	26	30	32	31	30	29	24	25	19	26
Daily low°C	13	15	19	21	26	28	28	27	26	21	19	14	21
Thermal comfort
High feelsDaily high feels-like°C	27	29	33	36	41	41	41	40	39	35	34	27	35
Mean feelsDaily mean feels-like°C	18	21	24	28	33	35	35	34	32	23	25	19	27
Low feelsDaily low feels-like°C	7	12	17	21	27	29	29	29	26	16	16	8	20
Humidity
HumidityRelative humidity%	80	81	82	82	76	73	73	81	82	73	73	70	77
Dewpoint°C	15.0	16.8	20.3	23.2	25.4	25.9	26.3	26.4	25.2	20.4	18.6	12.2	21.3
Precipitation
Rainfallmm	22	31	44	114	204	169	200	318	240	85	23	12	1461
Rain days≥1mm	3	8	8	12	15	16	21	25	23	11	4	3	149
Wind
Wind avgm/s	2.0	2.1	2.4	2.6	2.2	2.1	2.0	1.6	1.8	2.1	1.9	2.0	2.1
Wind gustsm/s	4.1	4.0	4.4	4.6	4.3	3.7	3.9	3.0	3.3	4.7	3.9	4.0	4.0
Sun & UV
Sunshinehrs/day	3.6	3.0	3.5	5.4	9.3	9.0	9.6	8.0	7.5	5.0	7.6	5.0	6.4
Clear skyindex	14%	18%	17%	27%	29%	24%	33%	24%	28%	28%	43%	34%	27%
UV indexmax avg	2.7	2.6	2.8	3.6	6.6	7.7	8.1	7.0	6.4	6.0	5.2	3.4	5.2

Based on 2014–2024 hourly climate data · Updated Mar 2025

Confidence: High

Lifestyle Calendar · Hanoi

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Annual

6/12

Dinner Outside

66Jan: 66% viability

75Feb: 75% viability

82Mar: 82% viability

65Apr: 65% viability

46May: 46% viability

38Jun: 38% viability

37Jul: 37% viability

36Aug: 36% viability

39Sep: 39% viability

74Oct: 74% viability

85Nov: 85% viability

57Dec: 57% viability

6/12

Dinner Outside

66Jan: 66% viability

75Feb: 75% viability

82Mar: 82% viability

65Apr: 65% viability

46May: 46% viability

38Jun: 38% viability

37Jul: 37% viability

36Aug: 36% viability

39Sep: 39% viability

74Oct: 74% viability

85Nov: 85% viability

57Dec: 57% viability

58%

Humid

3/12

Lunch Outside

80Jan: 80% viability

71Feb: 71% viability

54Mar: 54% viability

34Apr: 34% viability

16May: 16% viability

10Jun: 10% viability

8Jul: 8% viability

8Aug: 8% viability

10Sep: 10% viability

42Oct: 42% viability

63Nov: 63% viability

88Dec: 88% viability

3/12

Lunch Outside

80Jan: 80% viability

71Feb: 71% viability

54Mar: 54% viability

34Apr: 34% viability

16May: 16% viability

10Jun: 10% viability

8Jul: 8% viability

8Aug: 8% viability

10Sep: 10% viability

42Oct: 42% viability

63Nov: 63% viability

88Dec: 88% viability

40%

Humid

7/12

Walking

99Jan: 99% viability

98Feb: 98% viability

88Mar: 88% viability

66Apr: 66% viability

31May: 31% viability

12Jun: 12% viability

10Jul: 10% viability

20Aug: 20% viability

37Sep: 37% viability

76Oct: 76% viability

89Nov: 89% viability

100Dec: 100% viability

100

7/12

Walking

99Jan: 99% viability

98Feb: 98% viability

88Mar: 88% viability

66Apr: 66% viability

31May: 31% viability

12Jun: 12% viability

10Jul: 10% viability

20Aug: 20% viability

37Sep: 37% viability

76Oct: 76% viability

89Nov: 89% viability

100Dec: 100% viability

100

61%

Humid

3/12

Running

94Jan: 94% viability

83Feb: 83% viability

58Mar: 58% viability

26Apr: 26% viability

7May: 7% viability

0Jun: 0% viability

0Jul: 0% viability

1Aug: 1% viability

9Sep: 9% viability

42Oct: 42% viability

44Nov: 44% viability

89Dec: 89% viability

3/12

Running

94Jan: 94% viability

83Feb: 83% viability

58Mar: 58% viability

26Apr: 26% viability

7May: 7% viability

0Jun: 0% viability

0Jul: 0% viability

1Aug: 1% viability

9Sep: 9% viability

42Oct: 42% viability

44Nov: 44% viability

89Dec: 89% viability

38%

Humid

Tap any month for details · Click activity name for overview

ComfortableModerateUncomfortable

Based on 2014–2024 hourly climate data · Updated Mar 2025

Confidence: High

Hanoi · Vietnam

Climate

Climate Lab · Hanoi

Lifestyle Calendar · Hanoi

Climate

Climate Lab · Hanoi

Lifestyle Calendar · Hanoi

Air Quality Profile

Air Quality Profile

Who thrives in Hanoi

Things to consider in Hanoi

Why not Hanoi?

Frequently asked about Hanoi

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