Cát Bà climate — normals and trends

Q: What is the climate of Cát Bà?

Cát Bà has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 23.9 °C and it receives 1,934 mm of precipitation per year.

Q: What is the hottest day ever recorded in Cát Bà?

The hottest day measured in Cát Bà between 1940 and 2025 was 16 July 2023, reaching 34.6 °C.

Q: What is the coldest day in Cát Bà?

The coldest day measured in Cát Bà between 1940 and 2025 was 24 January 2016, at 6.1 °C.

Q: Does it snow in Cát Bà?

Almost never: Cát Bà sees virtually no snow, with about 0 frost days per year.

Q: Has the climate of Cát Bà warmed?

Yes: Cát Bà warmed by +0.7 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Cát Bà?

The wettest day measured in Cát Bà between 1940 and 2025 was 25 August 1985, with 233 mm of rain in 24 hours.

Q: What was the windiest day in Cát Bà?

The windiest day measured in Cát Bà between 1940 and 2025 was 27 September 2005, with winds reaching 80.5 km/h.

Q: What is the warmest month in Cát Bà?

The warmest month in Cát Bà is July (29.1 °C on average); the coldest is January (17.3 °C).

Q: How much does it rain in Cát Bà?

Cát Bà receives on average 1,934 mm of precipitation per year, spread over about 167 rainy days.

Q: Is it sunny in Cát Bà?

Cát Bà gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.

Cát Bà (Vietnam) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 23.9 °C and it receives 1,934 mm of precipitation per year.

These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.

The warmest month is July (29.1 °C on average) and the coldest is January (17.3 °C). Rainfall peaks in August.

Cát Bà averages 0 frost days, 60 hot days (≥ 30 °C) and 167 rainy days per year.

Cát Bà has warmed by +0.7 °C between 1940 and 2025, or +0.08 °C per decade. This trend is statistically significant.

The hottest day of the period reached 34.6 °C (on 16 July 2023) and the coldest 6.1 °C (on 24 January 2016).

Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.

Climate normals · ERA5

Cát BàHai Phong

coords: 20.73°, 107.05°
period: 1940–2025 · 86 yrs

CwaHumid subtropical, dry winterWarmest monthJulyColdest monthJanuaryWettest monthAugustDriest monthDecember

Mean daily temperature

23.9°C

Average daily high

25.2°C

Average daily low

22.7°C

Annual rainfall

1,934mm

Sunshine / day

8.2h

Mean relative humidity

81%

Average peak wind

21.4km/h

Seasonal range

11.8°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

60 d/yr

Rainy days (≥ 1 mm)

167 d/yr

Annual snowfall

0.0 cm

Average feels-like high

28.1 °C

Average feels-like low

24.3 °C

Average peak gust

32.9 km/h

Tropical nights (≥ 20 °C)

254 d/yr

Solar radiation

15.4 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.7 °C

since 1940

+0.1 °C per decade · r² = 0.21 · p = < 0.001

19402025

Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).

A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.

Records for the period

Hottest day

34.6 °C

16 July 2023

Coldest day

6.1 °C

24 January 2016

Wettest day

233 mm

25 August 1985

Windiest day

80.5 km/h

27 September 2005

Strongest gust

140.8 km/h

11 November 2013

Hottest feels-like

43.3 °C

4 July 2015

Coldest feels-like

-0.6 °C

24 January 2016

Sunniest day

13.1 h

25 June 1956

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	33.5 °C18 July 2025	12.9 °C8 February 2025	24.2 °C	2,197 mm	77
2024	34.3 °C5 September 2024	9.5 °C23 January 2024	25.0 °C	2,433 mm	100
2023	34.6 °C16 July 2023	10.6 °C22 December 2023	24.8 °C	1,553 mm	101
2022	33.4 °C6 September 2022	9.1 °C20 February 2022	24.1 °C	2,068 mm	85
2021	34.2 °C21 June 2021	9.6 °C8 January 2021	24.6 °C	1,757 mm	100
2020	33.2 °C21 May 2020	12.5 °C26 January 2020	24.8 °C	1,850 mm	96
2019	33.6 °C29 June 2019	11.8 °C1 January 2019	25.2 °C	1,645 mm	109
2018	33.2 °C5 July 2018	9.8 °C29 January 2018	24.3 °C	2,343 mm	71
2017	33.3 °C4 June 2017	12.8 °C18 December 2017	24.3 °C	2,585 mm	72
2016	33.7 °C9 August 2016	6.1 °C24 January 2016	24.3 °C	1,814 mm	94
2015	34.2 °C22 August 2015	12.3 °C6 February 2015	24.9 °C	1,819 mm	96
2014	33.3 °C21 June 2014	9.9 °C11 February 2014	24.1 °C	2,033 mm	85
2013	32.9 °C22 June 2013	10.6 °C19 December 2013	24.0 °C	2,128 mm	66
2012	33.2 °C22 July 2012	10.1 °C25 January 2012	24.0 °C	2,123 mm	76
2011	33.7 °C31 August 2011	8.7 °C11 January 2011	23.1 °C	1,732 mm	65
2010	33.1 °C5 July 2010	9.9 °C16 December 2010	24.3 °C	1,921 mm	67
2009	33.0 °C20 June 2009	10.4 °C24 January 2009	24.2 °C	1,906 mm	80
2008	33.0 °C23 September 2008	8.5 °C2 February 2008	23.6 °C	1,884 mm	53
2007	33.1 °C9 June 2007	13.2 °C19 January 2007	24.1 °C	1,411 mm	81
2006	32.4 °C14 July 2006	11.2 °C7 January 2006	24.3 °C	1,296 mm	60
2005	34.1 °C19 July 2005	10.0 °C1 January 2005	23.9 °C	1,640 mm	67
2004	32.8 °C25 June 2004	10.0 °C31 December 2004	23.8 °C	1,515 mm	53
2003	32.1 °C10 June 2003	9.6 °C6 January 2003	24.4 °C	1,661 mm	66
2002	32.7 °C13 July 2002	8.3 °C27 December 2002	24.1 °C	1,786 mm	62
2001	32.9 °C6 July 2001	12.3 °C14 December 2001	23.9 °C	1,869 mm	59
2000	32.6 °C13 August 2000	10.1 °C1 February 2000	23.7 °C	1,411 mm	62
1999	32.6 °C20 July 1999	9.6 °C23 December 1999	23.9 °C	1,461 mm	64
1998	33.0 °C22 May 1998	11.5 °C5 February 1998	24.8 °C	1,323 mm	88
1997	34.0 °C20 August 1997	11.4 °C24 January 1997	23.9 °C	2,102 mm	41
1996	33.3 °C2 August 1996	7.9 °C21 February 1996	23.6 °C	1,902 mm	52
1995	31.9 °C12 July 1995	12.1 °C31 January 1995	23.8 °C	1,644 mm	55
1994	32.7 °C3 May 1994	11.0 °C21 January 1994	24.0 °C	2,383 mm	34
1993	33.0 °C4 June 1993	9.4 °C16 January 1993	23.9 °C	1,451 mm	85
1992	34.0 °C31 August 1992	12.1 °C9 January 1992	23.5 °C	1,883 mm	49
1991	32.5 °C7 September 1991	7.1 °C28 December 1991	24.4 °C	1,219 mm	66
1990	33.3 °C28 August 1990	9.5 °C31 January 1990	24.0 °C	1,853 mm	71
1989	32.4 °C11 September 1989	8.8 °C13 January 1989	23.5 °C	1,701 mm	50
1988	32.2 °C23 June 1988	10.6 °C19 February 1988	23.8 °C	1,589 mm	65
1987	33.3 °C24 June 1987	11.6 °C30 November 1987	24.6 °C	2,133 mm	64
1986	32.7 °C2 July 1986	7.9 °C1 March 1986	23.8 °C	1,917 mm	58
1985	32.3 °C26 June 1985	11.2 °C10 January 1985	23.4 °C	2,148 mm	47
1984	32.9 °C1 September 1984	10.3 °C21 January 1984	23.3 °C	1,580 mm	49
1983	32.8 °C19 June 1983	8.6 °C21 January 1983	23.5 °C	1,580 mm	63
1982	32.5 °C28 July 1982	10.7 °C10 February 1982	23.7 °C	2,311 mm	57
1981	32.9 °C25 August 1981	12.7 °C20 December 1981	24.0 °C	2,420 mm	55
1980	32.4 °C22 July 1980	9.9 °C8 February 1980	24.0 °C	2,172 mm	50
1979	32.8 °C30 July 1979	9.6 °C31 January 1979	24.3 °C	1,933 mm	55
1978	32.7 °C29 July 1978	10.0 °C18 January 1978	23.9 °C	2,993 mm	57
1977	33.2 °C31 May 1977	7.6 °C30 January 1977	23.9 °C	1,732 mm	86
1976	32.3 °C23 August 1976	9.1 °C28 December 1976	23.3 °C	1,404 mm	42
1975	32.3 °C30 July 1975	7.3 °C14 December 1975	23.7 °C	2,336 mm	55
1974	32.6 °C12 August 1974	9.0 °C25 February 1974	23.6 °C	1,736 mm	52
1973	33.2 °C20 July 1973	11.7 °C2 January 1973	24.2 °C	3,052 mm	52
1972	33.0 °C11 July 1972	8.7 °C10 February 1972	23.4 °C	2,380 mm	36
1971	32.8 °C22 July 1971	9.9 °C30 January 1971	23.3 °C	1,993 mm	36
1970	32.1 °C3 September 1970	11.5 °C19 January 1970	23.7 °C	1,669 mm	73
1969	32.5 °C3 August 1969	9.8 °C5 February 1969	23.9 °C	1,252 mm	58
1968	33.7 °C26 July 1968	8.8 °C14 February 1968	23.7 °C	2,092 mm	70
1967	34.0 °C6 July 1967	9.2 °C16 January 1967	23.4 °C	1,923 mm	77
1966	32.3 °C18 August 1966	10.1 °C23 February 1966	24.4 °C	2,203 mm	47
1965	32.1 °C14 July 1965	8.0 °C17 December 1965	23.8 °C	2,013 mm	35
1964	33.6 °C8 August 1964	9.2 °C25 February 1964	23.7 °C	1,982 mm	60
1963	32.0 °C6 September 1963	10.4 °C14 January 1963	23.5 °C	2,291 mm	30
1962	32.9 °C1 September 1962	11.5 °C1 January 1962	23.5 °C	1,892 mm	58
1961	33.2 °C14 July 1961	10.9 °C13 January 1961	23.9 °C	1,939 mm	65
1960	32.3 °C14 June 1960	8.9 °C25 January 1960	23.8 °C	1,975 mm	43
1959	32.9 °C12 June 1959	10.0 °C10 January 1959	23.9 °C	2,057 mm	61
1958	32.9 °C23 July 1958	8.1 °C1 February 1958	23.9 °C	1,701 mm	48
1957	33.7 °C14 May 1957	8.8 °C11 February 1957	23.7 °C	1,747 mm	70
1956	31.8 °C4 September 1956	9.5 °C9 January 1956	23.5 °C	1,703 mm	33
1955	31.8 °C14 July 1955	9.4 °C10 January 1955	23.6 °C	1,558 mm	25
1954	32.8 °C30 June 1954	11.7 °C26 January 1954	24.2 °C	1,596 mm	60
1953	32.8 °C13 August 1953	13.3 °C19 February 1953	24.1 °C	2,006 mm	44
1952	32.5 °C11 July 1952	8.5 °C19 February 1952	24.3 °C	2,699 mm	56
1951	31.9 °C31 July 1951	7.9 °C13 January 1951	23.9 °C	2,606 mm	35
1950	32.9 °C23 July 1950	12.0 °C17 February 1950	24.4 °C	2,305 mm	57
1949	33.2 °C9 June 1949	9.7 °C8 January 1949	24.2 °C	1,558 mm	59
1948	32.0 °C17 June 1948	9.8 °C26 January 1948	24.0 °C	1,911 mm	44
1947	33.1 °C19 July 1947	9.7 °C20 December 1947	23.5 °C	1,560 mm	39
1946	33.5 °C7 July 1946	12.7 °C6 January 1946	24.5 °C	1,479 mm	89
1945	32.0 °C1 August 1945	8.5 °C4 February 1945	23.2 °C	3,002 mm	39
1944	32.1 °C22 July 1944	9.9 °C20 December 1944	23.6 °C	2,130 mm	35
1943	32.4 °C19 June 1943	10.6 °C21 November 1943	23.4 °C	1,973 mm	44
1942	31.9 °C8 August 1942	10.2 °C13 February 1942	23.7 °C	2,251 mm	29
1941	31.3 °C14 June 1941	11.3 °C1 February 1941	23.6 °C	2,119 mm	25
1940	31.7 °C1 July 1940	9.3 °C23 January 1940	23.4 °C	2,398 mm	26

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?

Year

Across the whole year

Average daily high

25.6 °C

+0.4 °C

Hot days (≥ 30 °C)

77 d/yr

+17

Frost days (< 0 °C)

0 d/yr

Annual rainfall

2197 mm

+263 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	19.6 °C	+1.0 °C	15 mm	-25 mm
Feb	18.4 °C	-0.6 °C	23 mm	-11 mm
Mar	20.9 °C	-0.4 °C	30 mm	-15 mm
Apr	24.7 °C	+0.2 °C	44 mm	-22 mm
May	28.3 °C	+0.3 °C	115 mm	-52 mm
Jun	30.3 °C	+0.4 °C	195 mm	-45 mm
Jul	30.6 °C	+0.4 °C	439 mm	+162 mm
Aug	30.0 °C	+0.1 °C	574 mm	+158 mm
Sep	29.9 °C	+0.8 °C	449 mm	+94 mm
Oct	27.9 °C	+0.8 °C	226 mm	+29 mm
Nov	23.8 °C	-0.4 °C	48 mm	-15 mm
Dec	22.0 °C	+1.4 °C	40 mm	+6 mm

The year's extremes

Hottest day

33.5 °C

18 Jul 2025

Coldest day

12.9 °C

8 Feb 2025

Wettest day

132.5 mm

21 Jul 2025

Windiest day

54.3 km/h

29 Sep 2025

Strongest gust

85.7 km/h

28 Sep 2025

Hottest feels-like

42.9 °C

30 Jul 2025

Coldest feels-like

7.7 °C

26 Jan 2025

Sunniest day

12.7 h

1 Jun 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Cát Bà?

Cát Bà has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 23.9 °C and it receives 1,934 mm of precipitation per year.

What is the hottest day ever recorded in Cát Bà?

The hottest day measured in Cát Bà between 1940 and 2025 was 16 July 2023, reaching 34.6 °C.

What is the coldest day in Cát Bà?

The coldest day measured in Cát Bà between 1940 and 2025 was 24 January 2016, at 6.1 °C.

Does it snow in Cát Bà?

Almost never: Cát Bà sees virtually no snow, with about 0 frost days per year.

Has the climate of Cát Bà warmed?

Yes: Cát Bà warmed by +0.7 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Cát Bà?

The wettest day measured in Cát Bà between 1940 and 2025 was 25 August 1985, with 233 mm of rain in 24 hours.

What was the windiest day in Cát Bà?

The windiest day measured in Cát Bà between 1940 and 2025 was 27 September 2005, with winds reaching 80.5 km/h.

What is the warmest month in Cát Bà?

The warmest month in Cát Bà is July (29.1 °C on average); the coldest is January (17.3 °C).

How much does it rain in Cát Bà?

Cát Bà receives on average 1,934 mm of precipitation per year, spread over about 167 rainy days.

Is it sunny in Cát Bà?

Cát Bà gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.

Are there tropical nights in Cát Bà?

Yes: Cát Bà has on average 254 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Cát Bà?

In Cát Bà, between 1940 and 2025, the highest apparent temperature reached 43.3 °C on 4 July 2015, and the lowest was -0.6 °C on 24 January 2016.

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