Sơn La climate — normals and trends

Q: What is the climate of Sơn La?

Sơn La has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 21.4 °C and it receives 1,425 mm of precipitation per year.

Q: What is the hottest day ever recorded in Sơn La?

The hottest day measured in Sơn La between 1940 and 2025 was 19 May 2019, reaching 38.4 °C.

Q: What is the coldest day in Sơn La?

The coldest day measured in Sơn La between 1940 and 2025 was 2 January 1974, at -1.2 °C.

Q: Does it snow in Sơn La?

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

Q: Has the climate of Sơn La warmed?

Yes: Sơn La warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Sơn La?

The wettest day measured in Sơn La between 1940 and 2025 was 4 July 1964, with 219 mm of rain in 24 hours.

Q: What was the windiest day in Sơn La?

The windiest day measured in Sơn La between 1940 and 2025 was 9 July 1956, with winds reaching 21.7 km/h.

Q: What is the warmest month in Sơn La?

The warmest month in Sơn La is June (25.3 °C on average); the coldest is January (15.3 °C).

Q: How much does it rain in Sơn La?

Sơn La receives on average 1,425 mm of precipitation per year, spread over about 164 rainy days.

Q: Is it sunny in Sơn La?

Sơn La gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.

Sơn La (Vietnam) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 21.4 °C and it receives 1,425 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 June (25.3 °C on average) and the coldest is January (15.3 °C). Rainfall peaks in August.

Sơn La averages 0 frost days, 81 hot days (≥ 30 °C) and 164 rainy days per year.

Sơn La has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.

The hottest day of the period reached 38.4 °C (on 19 May 2019) and the coldest -1.2 °C (on 2 January 1974).

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

Sơn LaSơn La Province

coords: 21.33°, 103.92°
period: 1940–2025 · 86 yrs

CwaHumid subtropical, dry winterWarmest monthJuneColdest monthJanuaryWettest monthAugustDriest monthDecember

Mean daily temperature

21.4°C

Average daily high

26.3°C

Average daily low

17.6°C

Annual rainfall

1,425mm

Sunshine / day

8.3h

Mean relative humidity

80%

Average peak wind

8.7km/h

Seasonal range

10.0°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

81 d/yr

Rainy days (≥ 1 mm)

164 d/yr

Annual snowfall

0.0 cm

Average feels-like high

29.0 °C

Average feels-like low

19.4 °C

Average peak gust

28.4 km/h

Tropical nights (≥ 20 °C)

158 d/yr

Solar radiation

15.2 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.7 °C

since 1940

+0.2 °C per decade · r² = 0.59 · 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

38.4 °C

19 May 2019

Coldest day

-1.2 °C

2 January 1974

Wettest day

219 mm

4 July 1964

Windiest day

21.7 km/h

9 July 1956

Strongest gust

74.9 km/h

9 July 1956

Hottest feels-like

42.4 °C

1 June 2023

Coldest feels-like

-4.3 °C

2 January 1974

Sunniest day

13.2 h

13 June 2013

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	35.5 °C9 May 2025	4.6 °C12 January 2025	22.0 °C	1,468 mm	114	0
2024	36.6 °C27 April 2024	7.4 °C25 January 2024	23.0 °C	1,709 mm	147	0
2023	37.3 °C30 May 2023	4.7 °C30 January 2023	22.9 °C	1,134 mm	133	0
2022	33.9 °C28 April 2022	5.5 °C19 December 2022	21.9 °C	1,435 mm	92	0
2021	36.0 °C22 May 2021	5.8 °C2 January 2021	22.2 °C	1,036 mm	129	0
2020	36.2 °C21 May 2020	7.7 °C22 December 2020	22.2 °C	1,165 mm	119	0
2019	38.4 °C19 May 2019	2.6 °C8 December 2019	23.2 °C	1,032 mm	166	0
2018	34.8 °C9 May 2018	6.3 °C30 January 2018	22.3 °C	1,891 mm	117	0
2017	37.1 °C6 June 2017	4.6 °C20 December 2017	22.2 °C	1,439 mm	107	0
2016	35.2 °C16 April 2016	3.7 °C24 January 2016	22.5 °C	1,137 mm	138	0
2015	38.1 °C6 May 2015	6.0 °C15 January 2015	22.9 °C	1,204 mm	142	0
2014	36.1 °C22 May 2014	1.6 °C23 January 2014	22.2 °C	1,241 mm	121	0
2013	35.2 °C22 May 2013	3.5 °C20 December 2013	21.8 °C	1,393 mm	104	0
2012	36.2 °C3 May 2012	7.1 °C25 January 2012	22.2 °C	1,363 mm	113	0
2011	33.4 °C26 July 2011	4.7 °C27 December 2011	20.9 °C	1,020 mm	74	0
2010	36.5 °C19 May 2010	7.0 °C19 February 2010	22.7 °C	1,119 mm	137	0
2009	35.0 °C24 April 2009	4.3 °C11 January 2009	22.3 °C	1,014 mm	127	0
2008	33.5 °C8 April 2008	4.4 °C1 December 2008	21.0 °C	1,501 mm	74	0
2007	37.8 °C2 April 2007	3.5 °C29 January 2007	21.9 °C	1,162 mm	96	0
2006	35.2 °C11 April 2006	3.3 °C23 December 2006	22.2 °C	1,074 mm	89	0
2005	35.3 °C27 May 2005	4.3 °C20 December 2005	21.9 °C	1,283 mm	104	0
2004	33.9 °C1 July 2004	5.1 °C9 February 2004	21.4 °C	1,271 mm	73	0
2003	36.1 °C7 May 2003	6.1 °C22 December 2003	22.3 °C	1,099 mm	111	0
2002	33.9 °C15 March 2002	7.0 °C6 January 2002	22.0 °C	1,745 mm	92	0
2001	34.2 °C10 April 2001	5.1 °C24 December 2001	21.8 °C	1,254 mm	66	0
2000	34.8 °C25 April 2000	5.0 °C2 February 2000	21.8 °C	1,162 mm	82	0
1999	33.4 °C10 March 1999	-0.4 °C25 December 1999	21.7 °C	1,081 mm	75	3
1998	35.0 °C15 May 1998	6.9 °C13 December 1998	22.4 °C	1,122 mm	106	0
1997	35.2 °C6 June 1997	8.3 °C12 January 1997	21.9 °C	1,643 mm	72	0
1996	34.2 °C17 March 1996	1.6 °C1 January 1996	21.2 °C	1,802 mm	58	0
1995	35.4 °C21 May 1995	2.4 °C31 December 1995	21.4 °C	1,496 mm	80	0
1994	34.9 °C2 May 1994	7.5 °C1 January 1994	21.7 °C	2,046 mm	58	0
1993	33.5 °C5 April 1993	1.5 °C28 December 1993	21.2 °C	1,321 mm	52	0
1992	35.1 °C22 April 1992	5.8 °C11 November 1992	21.3 °C	1,590 mm	109	0
1991	34.3 °C24 March 1991	6.8 °C28 December 1991	22.1 °C	1,534 mm	105	0
1990	35.0 °C22 April 1990	5.9 °C7 December 1990	21.4 °C	1,459 mm	70	0
1989	34.7 °C21 April 1989	6.9 °C14 January 1989	21.1 °C	1,631 mm	67	0
1988	36.7 °C13 June 1988	6.2 °C18 December 1988	21.6 °C	1,146 mm	87	0
1987	34.9 °C25 May 1987	3.7 °C18 December 1987	22.0 °C	1,379 mm	111	0
1986	34.8 °C2 April 1986	2.4 °C11 January 1986	21.3 °C	1,358 mm	73	0
1985	34.6 °C11 April 1985	3.4 °C24 December 1985	20.8 °C	1,533 mm	51	0
1984	35.7 °C19 March 1984	4.4 °C9 January 1984	21.1 °C	1,473 mm	83	0
1983	35.5 °C24 May 1983	2.9 °C4 December 1983	21.0 °C	1,515 mm	100	0
1982	34.7 °C16 March 1982	1.6 °C28 December 1982	21.5 °C	1,780 mm	77	0
1981	34.8 °C8 April 1981	5.4 °C12 January 1981	21.5 °C	2,325 mm	75	0
1980	36.9 °C30 April 1980	5.8 °C9 February 1980	21.6 °C	1,869 mm	83	0
1979	34.4 °C13 May 1979	7.0 °C29 November 1979	21.4 °C	1,379 mm	69	0
1978	32.7 °C26 May 1978	4.5 °C17 December 1978	20.9 °C	2,408 mm	54	0
1977	35.2 °C10 June 1977	5.5 °C31 January 1977	20.8 °C	1,581 mm	79	0
1976	32.3 °C17 April 1976	0.5 °C1 January 1976	20.6 °C	1,505 mm	51	0
1975	35.7 °C28 April 1975	-1.1 °C31 December 1975	20.8 °C	1,519 mm	65	5
1974	35.4 °C24 February 1974	-1.2 °C2 January 1974	20.9 °C	1,661 mm	68	3
1973	38.3 °C8 April 1973	0.9 °C27 December 1973	21.8 °C	1,796 mm	104	0
1972	36.3 °C12 May 1972	5.5 °C8 February 1972	21.5 °C	1,709 mm	99	0
1971	35.9 °C31 March 1971	1.4 °C6 January 1971	20.6 °C	1,677 mm	54	0
1970	37.1 °C12 May 1970	6.9 °C31 January 1970	21.2 °C	1,548 mm	84	0
1969	36.2 °C14 May 1969	5.1 °C30 November 1969	21.5 °C	1,350 mm	120	0
1968	33.9 °C23 March 1968	6.0 °C8 February 1968	21.2 °C	1,535 mm	67	0
1967	36.4 °C30 March 1967	2.1 °C18 January 1967	21.1 °C	1,325 mm	104	0
1966	33.9 °C13 May 1966	4.0 °C1 January 1966	21.1 °C	1,551 mm	43	0
1965	35.2 °C3 April 1965	4.3 °C18 January 1965	20.7 °C	1,359 mm	43	0
1964	33.0 °C20 March 1964	2.9 °C19 December 1964	20.8 °C	1,669 mm	50	0
1963	33.9 °C13 May 1963	2.7 °C27 January 1963	21.1 °C	1,460 mm	88	0
1962	35.7 °C30 May 1962	4.0 °C7 December 1962	21.1 °C	1,136 mm	83	0
1961	35.2 °C16 May 1961	0.7 °C18 January 1961	21.5 °C	1,557 mm	71	0
1960	37.6 °C27 April 1960	3.0 °C2 January 1960	21.7 °C	1,458 mm	88	0
1959	36.6 °C21 May 1959	5.0 °C14 January 1959	21.5 °C	1,250 mm	93	0
1958	38.2 °C25 April 1958	3.6 °C14 December 1958	21.4 °C	1,435 mm	95	0
1957	37.8 °C24 May 1957	3.7 °C14 February 1957	21.7 °C	1,533 mm	97	0
1956	37.0 °C19 April 1956	3.2 °C11 January 1956	20.9 °C	1,461 mm	67	0
1955	35.1 °C17 April 1955	0.4 °C12 January 1955	20.7 °C	1,240 mm	62	0
1954	35.5 °C17 April 1954	2.7 °C17 December 1954	21.3 °C	1,028 mm	75	0
1953	33.7 °C22 July 1953	4.6 °C13 December 1953	21.3 °C	1,168 mm	72	0
1952	33.6 °C3 May 1952	4.5 °C13 December 1952	21.4 °C	1,594 mm	51	0
1951	34.0 °C10 April 1951	7.2 °C14 January 1951	20.8 °C	1,598 mm	31	0
1950	35.3 °C22 April 1950	6.3 °C7 January 1950	20.9 °C	1,543 mm	43	0
1949	35.6 °C14 June 1949	4.4 °C10 January 1949	21.4 °C	1,353 mm	53	0
1948	34.9 °C14 March 1948	1.6 °C4 January 1948	20.7 °C	1,360 mm	35	0
1947	34.9 °C7 May 1947	3.3 °C31 December 1947	20.6 °C	1,074 mm	31	0
1946	35.7 °C18 March 1946	3.0 °C11 January 1946	21.1 °C	1,006 mm	90	0
1945	32.4 °C21 May 1945	4.0 °C18 January 1945	19.9 °C	1,216 mm	21	0
1944	34.6 °C9 April 1944	1.4 °C21 December 1944	20.5 °C	1,327 mm	26	0
1943	35.2 °C24 March 1943	5.2 °C22 November 1943	20.4 °C	1,520 mm	36	0
1942	36.8 °C17 April 1942	4.0 °C7 December 1942	20.5 °C	1,683 mm	28	0
1941	34.3 °C23 March 1941	5.7 °C3 February 1941	20.9 °C	1,252 mm	33	0
1940	31.5 °C26 April 1940	4.0 °C1 January 1940	20.4 °C	1,215 mm	21	0

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

26.9 °C

+0.6 °C

Hot days (≥ 30 °C)

114 d/yr

+33

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1468 mm

+43 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	21.5 °C	+0.7 °C	1 mm	-22 mm
Feb	22.7 °C	-0.3 °C	21 mm	-4 mm
Mar	27.2 °C	+0.4 °C	4 mm	-52 mm
Apr	29.4 °C	+0.4 °C	37 mm	-47 mm
May	30.1 °C	+0.2 °C	121 mm	-31 mm
Jun	29.9 °C	+0.7 °C	231 mm	-6 mm
Jul	29.3 °C	+0.5 °C	468 mm	+202 mm
Aug	29.5 °C	+0.9 °C	236 mm	-54 mm
Sep	29.7 °C	+1.4 °C	197 mm	+22 mm
Oct	27.5 °C	+1.0 °C	93 mm	+20 mm
Nov	23.0 °C	-0.9 °C	37 mm	+10 mm
Dec	22.5 °C	+1.5 °C	21 mm	+4 mm

The year's extremes

Hottest day

35.5 °C

9 May 2025

Coldest day

4.6 °C

12 Jan 2025

Wettest day

64.7 mm

11 Jul 2025

Windiest day

17.4 km/h

1 Jun 2025

Strongest gust

72.4 km/h

29 Sep 2025

Hottest feels-like

41.0 °C

9 May 2025

Coldest feels-like

2.5 °C

12 Jan 2025

Sunniest day

12.5 h

17 Jul 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 Sơn La?

Sơn La has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 21.4 °C and it receives 1,425 mm of precipitation per year.

What is the hottest day ever recorded in Sơn La?

The hottest day measured in Sơn La between 1940 and 2025 was 19 May 2019, reaching 38.4 °C.

What is the coldest day in Sơn La?

The coldest day measured in Sơn La between 1940 and 2025 was 2 January 1974, at -1.2 °C.

Does it snow in Sơn La?

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

Has the climate of Sơn La warmed?

Yes: Sơn La warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Sơn La?

The wettest day measured in Sơn La between 1940 and 2025 was 4 July 1964, with 219 mm of rain in 24 hours.

What was the windiest day in Sơn La?

The windiest day measured in Sơn La between 1940 and 2025 was 9 July 1956, with winds reaching 21.7 km/h.

What is the warmest month in Sơn La?

The warmest month in Sơn La is June (25.3 °C on average); the coldest is January (15.3 °C).

How much does it rain in Sơn La?

Sơn La receives on average 1,425 mm of precipitation per year, spread over about 164 rainy days.

Is it sunny in Sơn La?

Sơn La gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.

Are there tropical nights in Sơn La?

Yes: Sơn La has on average 158 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Sơn La?

In Sơn La, between 1940 and 2025, the highest apparent temperature reached 42.4 °C on 1 June 2023, and the lowest was -4.3 °C on 2 January 1974.

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