Vietnam · 1991–2020

Best time to visit
Hạ Long

For Hạ Long, December has the most comfortable weather in our climate comparison. Typical daytime highs are 22.3°C, nights average 15.3°C, and rainfall totals about 27 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.

Best all-round monthDecember

Typical daytime high22.3°C

Typical night-time low15.3°C

December rainfall27 mm

Overall comfort

December

Other strong months: February and January

93/100 weather score

Beach weather

October

Other strong months: April and November

84/100 weather score

Outdoor sightseeing

January

Other strong months: February and December

88/100 weather score

Make the answer personal

Choose the weather
that suits you.

Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.

Daytime high: at least 18°CDaytime high: at most 28°CMonthly rain: no more than 100 mmWet days: no more than 10

5 months fit your choices for Hạ Long

January20°C day · 47 mm rain · 5 wet days

February20.9°C day · 22 mm rain · 5.8 wet days

April27.1°C day · 66 mm rain · 7.4 wet days

November26.4°C day · 49 mm rain · 4.1 wet days

December22.3°C day · 27 mm rain · 3.4 wet days

August has the lowest comfort score at 5 out of 100, compared with December at 93. The main reason is that 343 mm of rain falls.

Quick answers

Planning a trip to Hạ Long?

These answers come from the same measured monthly climate record shown on this page.

When is the best time to visit Hạ Long?

December is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 22.3°C and 27 mm of rain.

What is the hottest month in Hạ Long?

June is hottest in this record, with a typical daytime high of 32.4°C and a night-time low of 26°C.

Which month has the least rain?

February has the lowest monthly rainfall total at 22 mm.

Is this a weather forecast?

No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.

Month by month

See how the weather
changes through the year.

The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.

8220° / 14.3°

8620.9° / 15.7°

8122.8° / 17.9°

7027.1° / 21.4°

3530.5° / 24.2°

2532.4° / 26°

1532.1° / 25.9°

531.7° / 25.4°

2531° / 24.4°

6029.5° / 22.2°

8226.4° / 19°

9322.3° / 15.3°

Monthly climate evidence for Hạ Long — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 32 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	20°C	14.3°C	47 mm	5	19.6°C	10 h 59	82	Strong coverage
February	20.9°C	15.7°C	22 mm	5.8	19.1°C	11 h 26	86	Good coverage
March	22.8°C	17.9°C	58 mm	10.2	20.1°C	11 h 58	81	Strong coverage
April	27.1°C	21.4°C	66 mm	7.4	22.9°C	12 h 36	70	Strong coverage
May	30.5°C	24.2°C	188 mm	8.8	26.8°C	13 h 07	35	Strong coverage
June	32.4°C	26°C	193 mm	9.4	29.0°C	13 h 24	25	Strong coverage
July	32.1°C	25.9°C	249 mm	12.2	29.4°C	13 h 17	15	Good coverage
August	31.7°C	25.4°C	343 mm	13.7	29.6°C	12 h 51	5	Strong coverage
September	31°C	24.4°C	233 mm	11.2	29.3°C	12 h 14	25	Good coverage
October	29.5°C	22.2°C	82 mm	5.6	27.7°C	11 h 38	60	Strong coverage
November	26.4°C	19°C	49 mm	4.1	25.1°C	11 h 07	82	Good coverage
December	22.3°C	15.3°C	27 mm	3.4	21.9°C	10 h 52	93	Good coverage

Records at PHU LIEN, 1974–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	29.0°C8 Jan 2020	5.5°C22 Jan 1983	102 mm6 Jan 1994	275 mm1994 · driest 0 mm in 2014	45
February	32.0°C25 Feb 2010	5.1°C21 Feb 1996	44 mm9 Feb 2021	119 mm2022 · driest 0 mm in 1991	44
March	34.8°C5 Mar 2003	5.1°C2 Mar 2006	102 mm14 Mar 2001	228 mm2001 · driest 0 mm in 1991	44
April	35.5°C19 Apr 2009	12.0°C4 Apr 1996	119 mm17 Apr 2021	175 mm2016 · driest 0 mm in 1992	41
May	39.1°C8 May 1982	15.0°C6 May 1994	199 mm7 May 1996	461 mm2012 · driest 0 mm in 1983	44
June	44.2°C12 Jun 2022	20.5°C14 Jun 2000	228 mm9 Jun 2024	405 mm2024 · driest 0 mm in 1991	45
July	39.0°C25 Jul 1977	21.2°C26 Jul 1987	259 mm21 Jul 2018	736 mm2018 · driest 0 mm in 1986	45
August	39.0°C24 Aug 2001	16.9°C27 Aug 1982	178 mm26 Aug 2022	678 mm2006 · driest 0 mm in 1986	47
September	39.9°C7 Sep 1990	15.6°C27 Sep 1997	214 mm11 Sep 2024	422 mm2024 · driest 0 mm in 1990	48
October	34.4°C5 Oct 2023	13.3°C30 Oct 1988	208 mm29 Oct 2012	349 mm2017 · driest 0 mm in 1989	48
November	33.1°C6 Nov 2023	10.4°C28 Nov 2007	128 mm3 Nov 2005	240 mm2005 · driest 0 mm in 1986	47
December	35.4°C15 Dec 1984	0.0°C14 Dec 1975	101 mm1 Dec 2005	131 mm2005 · driest 0 mm in 1987	48

Typical days per month at PHU LIEN, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	3	0	<1
February	5	<1	<1
March	8	<1	1
April	20	5	1
May	27	19	4
June	27	24	4
July	28	24	5
August	28	23	7
September	27	21	5
October	27	16	1
November	19	4	1
December	7	0	<1

How often different weather occurs at PHU LIEN, based on its daily record
Month	Dry days reaching 20°C	Wet days	Days with heavy rain	Weeks with 3+ wet days	Typical high by year
January	50%	16%	3%	23%	17.3–21.8°C
February	53%	21%	2%	22%	17.8–23.5°C
March	62%	31%	4%	46%	20.9–24.9°C
April	76%	24%	6%	25%	25.5–28.9°C
May	68%	29%	13%	38%	29.2–31.6°C
June	68%	31%	17%	50%	31.5–33.3°C
July	61%	38%	20%	56%	31.0–33.3°C
August	58%	43%	27%	68%	30.9–32.5°C
September	65%	37%	19%	49%	30.0–31.9°C
October	83%	18%	6%	18%	27.8–30.1°C
November	85%	13%	4%	15%	24.3–27.4°C
December	70%	10%	2%	8%	20.3–23.8°C

A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.

1976Each stripe is one year’s mean temperature against the 23-year average. Warmest: 2003. Coolest: 2011.2025

The evidence behind this page

Where these figures
come from.

Place identity: GeoNames 1580410
NOAA station: VMM00048826 · PHU LIEN
Station distance: 48.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 24 usable years
Daylight: Calculated from latitude 20.95°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 32 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

Next step

Choose your month.
Then plan the details.

The weather comparison for Hạ Long is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.

How travel partnerships will work

Keep exploring

Same climate evidence,
different places.

These places read the same station, so their climate numbers are identical. Their setting, population and distance from PHU LIEN are not.

Hai PhongHaiphongDecember is the strongest comfort month on this shared record · population 2,625,200Explore the year Quảng NinhThị Trấn Đông TriềuDecember is the strongest comfort month on this shared record · population 248,896Explore the year Hai PhongHải DươngDecember is the strongest comfort month on this shared record · population 241,373Explore the year Hai PhongChí LinhDecember is the strongest comfort month on this shared record · population 220,421Explore the year Hai PhongKiến AnDecember is the strongest comfort month on this shared record · population 118,047Explore the year Quảng NinhThị Trấn Mạo KhêDecember is the strongest comfort month on this shared record · population 72,012Explore the year

Or put two places side by side: Hạ Long vs Haiphong