Ratchathewi climate — normals and trends

Q: What is the climate of Ratchathewi?

Ratchathewi has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 28.2 °C and it receives 1,229 mm of precipitation per year.

Q: What is the hottest day ever recorded in Ratchathewi?

The hottest day measured in Ratchathewi between 1940 and 2025 was 23 April 1990, reaching 40.4 °C.

Q: What is the coldest day in Ratchathewi?

The coldest day measured in Ratchathewi between 1940 and 2025 was 12 January 1955, at 11.8 °C.

Q: Does it snow in Ratchathewi?

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

Q: Has the climate of Ratchathewi warmed?

Yes: Ratchathewi warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Ratchathewi?

The wettest day measured in Ratchathewi between 1940 and 2025 was 6 September 2012, with 160 mm of rain in 24 hours.

Q: What was the windiest day in Ratchathewi?

The windiest day measured in Ratchathewi between 1940 and 2025 was 3 November 2009, with winds reaching 30.8 km/h.

Q: What is the warmest month in Ratchathewi?

The warmest month in Ratchathewi is April (30.3 °C on average); the coldest is December (25.8 °C).

Q: How much does it rain in Ratchathewi?

Ratchathewi receives on average 1,229 mm of precipitation per year, spread over about 175 rainy days.

Q: Is it sunny in Ratchathewi?

Ratchathewi gets on average 10.0 hours of sunshine per day, roughly 3,650 hours per year over 1940-2025.

Ratchathewi (Thailand) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 28.2 °C and it receives 1,229 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 April (30.3 °C on average) and the coldest is December (25.8 °C). Rainfall peaks in September.

Ratchathewi averages 0 frost days, 325 hot days (≥ 30 °C) and 175 rainy days per year.

Ratchathewi has warmed by +2.1 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.

The hottest day of the period reached 40.4 °C (on 23 April 1990) and the coldest 11.8 °C (on 12 January 1955).

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

RatchathewiBangkok

coords: 13.76°, 100.53°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthAprilColdest monthDecemberWettest monthSeptemberDriest monthDecember

Mean daily temperature

28.2°C

Average daily high

32.5°C

Average daily low

24.9°C

Annual rainfall

1,229mm

Sunshine / day

10.0h

Mean relative humidity

74%

Average peak wind

14.0km/h

Seasonal range

4.5°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

325 d/yr

Rainy days (≥ 1 mm)

175 d/yr

Annual snowfall

0.0 cm

Average feels-like high

37.3 °C

Average feels-like low

29.1 °C

Average peak gust

31.6 km/h

Tropical nights (≥ 20 °C)

344 d/yr

Solar radiation

18.9 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.1 °C

since 1940

+0.2 °C per decade · r² = 0.75 · 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

40.4 °C

23 April 1990

Coldest day

11.8 °C

12 January 1955

Wettest day

160 mm

6 September 2012

Windiest day

30.8 km/h

3 November 2009

Strongest gust

74.2 km/h

9 August 2007

Hottest feels-like

46.8 °C

19 April 1953

Coldest feels-like

9.0 °C

25 December 1999

Sunniest day

12.8 h

25 June 1942

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	37.2 °C25 April 2025	16.7 °C29 November 2025	28.6 °C	1,258 mm	338
2024	38.3 °C21 April 2024	19.0 °C23 December 2024	29.5 °C	1,112 mm	353
2023	38.8 °C6 May 2023	17.8 °C31 January 2023	29.2 °C	1,025 mm	345
2022	37.3 °C14 April 2022	18.8 °C19 December 2022	28.6 °C	1,498 mm	335
2021	37.7 °C19 May 2021	15.8 °C13 January 2021	28.6 °C	1,381 mm	335
2020	37.6 °C22 April 2020	18.8 °C22 December 2020	29.2 °C	1,148 mm	341
2019	39.6 °C4 May 2019	17.5 °C7 December 2019	29.3 °C	955 mm	342
2018	36.0 °C15 April 2018	18.0 °C13 January 2018	28.6 °C	1,416 mm	338
2017	37.6 °C25 April 2017	15.1 °C20 December 2017	28.6 °C	1,522 mm	338
2016	38.1 °C13 April 2016	15.4 °C26 January 2016	29.2 °C	1,125 mm	347
2015	38.7 °C1 June 2015	17.0 °C16 January 2015	29.2 °C	990 mm	343
2014	37.9 °C3 June 2014	13.9 °C24 January 2014	28.7 °C	992 mm	340
2013	39.2 °C2 May 2013	15.7 °C28 December 2013	28.6 °C	1,215 mm	331
2012	39.3 °C25 April 2012	20.5 °C9 January 2012	29.1 °C	1,277 mm	354
2011	37.3 °C18 April 2011	17.6 °C17 March 2011	28.1 °C	1,361 mm	328
2010	40.0 °C10 May 2010	19.5 °C18 December 2010	29.2 °C	1,142 mm	345
2009	39.5 °C23 April 2009	15.1 °C12 January 2009	28.6 °C	1,148 mm	345
2008	36.8 °C17 April 2008	18.1 °C10 December 2008	28.4 °C	1,190 mm	342
2007	38.1 °C16 June 2007	16.4 °C4 February 2007	28.9 °C	1,148 mm	344
2006	38.4 °C3 May 2006	16.7 °C24 December 2006	29.2 °C	1,172 mm	347
2005	38.8 °C6 May 2005	16.4 °C3 January 2005	29.1 °C	1,039 mm	337
2004	38.7 °C15 April 2004	17.9 °C15 February 2004	29.0 °C	941 mm	355
2003	39.2 °C6 May 2003	17.0 °C13 January 2003	29.0 °C	1,009 mm	349
2002	37.7 °C9 April 2002	18.5 °C3 January 2002	29.0 °C	1,149 mm	351
2001	39.6 °C20 April 2001	17.3 °C24 December 2001	28.8 °C	1,209 mm	338
2000	38.4 °C4 April 2000	16.2 °C4 February 2000	28.7 °C	1,150 mm	353
1999	37.4 °C20 March 1999	12.3 °C25 December 1999	28.1 °C	1,402 mm	325
1998	39.6 °C20 July 1998	18.3 °C17 December 1998	29.4 °C	1,019 mm	350
1997	39.8 °C20 June 1997	16.1 °C13 January 1997	29.1 °C	915 mm	352
1996	38.9 °C19 April 1996	14.5 °C1 January 1996	28.2 °C	1,487 mm	332
1995	39.6 °C15 April 1995	14.2 °C8 January 1995	28.5 °C	1,442 mm	336
1994	39.0 °C5 May 1994	17.7 °C27 January 1994	28.6 °C	1,130 mm	346
1993	39.3 °C1 May 1993	15.4 °C31 January 1993	28.5 °C	943 mm	337
1992	39.2 °C10 May 1992	16.5 °C2 December 1992	28.5 °C	964 mm	332
1991	38.2 °C19 May 1991	19.1 °C6 February 1991	28.8 °C	950 mm	354
1990	40.4 °C23 April 1990	16.1 °C6 December 1990	28.9 °C	951 mm	348
1989	39.1 °C4 April 1989	17.6 °C4 December 1989	28.6 °C	911 mm	341
1988	37.4 °C10 July 1988	17.3 °C13 December 1988	28.3 °C	1,406 mm	334
1987	39.1 °C11 April 1987	15.6 °C8 December 1987	28.6 °C	1,084 mm	331
1986	37.4 °C21 April 1986	15.3 °C7 January 1986	27.9 °C	1,177 mm	327
1985	38.8 °C13 April 1985	16.0 °C17 December 1985	28.0 °C	1,278 mm	322
1984	38.8 °C5 May 1984	13.8 °C10 January 1984	28.0 °C	850 mm	337
1983	38.2 °C20 May 1983	14.5 °C25 January 1983	28.2 °C	1,256 mm	309
1982	38.5 °C2 May 1982	13.2 °C29 December 1982	28.1 °C	981 mm	329
1981	37.2 °C15 March 1981	14.7 °C14 January 1981	27.9 °C	1,242 mm	316
1980	39.9 °C25 April 1980	16.9 °C25 December 1980	28.6 °C	1,089 mm	349
1979	40.2 °C20 April 1979	16.8 °C27 December 1979	28.7 °C	880 mm	352
1978	38.6 °C29 April 1978	16.8 °C16 December 1978	28.2 °C	1,346 mm	335
1977	37.8 °C8 June 1977	17.5 °C6 March 1977	28.3 °C	826 mm	353
1976	38.6 °C13 April 1976	12.9 °C1 January 1976	27.5 °C	1,487 mm	319
1975	39.4 °C29 April 1975	12.8 °C30 December 1975	27.4 °C	1,546 mm	309
1974	37.9 °C22 April 1974	13.5 °C4 January 1974	27.5 °C	1,538 mm	315
1973	38.1 °C23 April 1973	13.6 °C27 December 1973	28.0 °C	1,131 mm	330
1972	39.3 °C4 May 1972	14.3 °C16 January 1972	27.9 °C	1,633 mm	325
1971	36.7 °C30 April 1971	14.8 °C5 January 1971	27.2 °C	1,293 mm	300
1970	38.7 °C10 May 1970	18.2 °C2 January 1970	27.8 °C	1,334 mm	320
1969	37.7 °C13 May 1969	15.8 °C23 December 1969	28.2 °C	1,146 mm	313
1968	37.9 °C28 May 1968	14.4 °C6 January 1968	28.0 °C	1,015 mm	342
1967	40.2 °C2 May 1967	13.7 °C17 January 1967	27.7 °C	1,047 mm	317
1966	37.7 °C26 April 1966	16.8 °C2 January 1966	27.5 °C	1,517 mm	278
1965	37.9 °C30 April 1965	15.1 °C22 January 1965	27.7 °C	1,391 mm	320
1964	37.2 °C6 April 1964	15.0 °C19 December 1964	27.6 °C	1,304 mm	305
1963	37.2 °C16 May 1963	12.5 °C16 January 1963	27.6 °C	1,308 mm	307
1962	36.6 °C23 April 1962	15.0 °C6 December 1962	27.6 °C	1,258 mm	316
1961	37.0 °C26 April 1961	13.6 °C19 January 1961	27.6 °C	1,156 mm	320
1960	39.3 °C25 March 1960	12.6 °C4 January 1960	28.1 °C	1,132 mm	326
1959	37.3 °C27 April 1959	17.7 °C3 March 1959	28.0 °C	1,100 mm	323
1958	38.0 °C5 April 1958	17.4 °C6 January 1958	27.8 °C	1,084 mm	302
1957	38.6 °C18 May 1957	16.5 °C6 February 1957	27.9 °C	1,509 mm	327
1956	35.9 °C30 March 1956	13.3 °C17 January 1956	27.2 °C	1,273 mm	302
1955	37.3 °C17 April 1955	11.8 °C12 January 1955	27.2 °C	1,540 mm	299
1954	37.7 °C16 April 1954	13.8 °C17 December 1954	27.8 °C	975 mm	329
1953	35.9 °C18 April 1953	15.0 °C12 December 1953	26.6 °C	2,667 mm	267
1952	36.4 °C30 April 1952	14.3 °C12 December 1952	27.4 °C	1,621 mm	307
1951	37.6 °C10 April 1951	15.6 °C2 January 1951	27.7 °C	1,097 mm	308
1950	38.7 °C23 April 1950	16.7 °C4 January 1950	27.5 °C	1,200 mm	302
1949	36.9 °C24 February 1949	14.9 °C17 January 1949	27.5 °C	981 mm	312
1948	36.3 °C12 March 1948	14.9 °C3 January 1948	27.4 °C	1,219 mm	302
1947	38.0 °C7 May 1947	15.6 °C30 December 1947	27.7 °C	1,183 mm	320
1946	37.7 °C10 March 1946	14.9 °C9 January 1946	27.3 °C	1,286 mm	310
1945	36.6 °C2 March 1945	15.5 °C31 December 1945	27.2 °C	1,423 mm	294
1944	37.5 °C8 April 1944	14.1 °C21 December 1944	27.4 °C	1,531 mm	283
1943	36.3 °C27 April 1943	15.9 °C13 January 1943	26.7 °C	1,452 mm	253
1942	36.8 °C24 February 1942	15.3 °C16 December 1942	27.0 °C	1,238 mm	265
1941	38.0 °C7 May 1941	20.0 °C25 December 1941	27.4 °C	1,460 mm	241
1940	38.8 °C11 March 1940	14.0 °C3 January 1940	26.9 °C	1,493 mm	262

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

32.7 °C

+0.2 °C

Hot days (≥ 30 °C)

338 d/yr

+13

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1258 mm

+29 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	30.6 °C	-0.9 °C	0 mm	-16 mm
Feb	32.7 °C	0.0 °C	36 mm	+8 mm
Mar	34.1 °C	+0.2 °C	31 mm	-12 mm
Apr	34.9 °C	0.0 °C	68 mm	-4 mm
May	33.2 °C	-0.7 °C	222 mm	+83 mm
Jun	33.7 °C	+0.8 °C	94 mm	-37 mm
Jul	32.9 °C	+0.4 °C	151 mm	+12 mm
Aug	33.9 °C	+1.6 °C	115 mm	-33 mm
Sep	32.2 °C	+0.4 °C	281 mm	+36 mm
Oct	32.3 °C	+0.9 °C	149 mm	-52 mm
Nov	30.3 °C	-1.0 °C	107 mm	+49 mm
Dec	31.7 °C	+0.8 °C	5 mm	-5 mm

The year's extremes

Hottest day

37.2 °C

25 Apr 2025

Coldest day

16.7 °C

29 Nov 2025

Wettest day

58.7 mm

7 Sep 2025

Windiest day

23.3 km/h

22 Jul 2025

Strongest gust

67.0 km/h

23 Jul 2025

Hottest feels-like

45.0 °C

25 Apr 2025

Coldest feels-like

15.4 °C

29 Nov 2025

Sunniest day

12.4 h

2 Aug 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 Ratchathewi?

Ratchathewi has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 28.2 °C and it receives 1,229 mm of precipitation per year.

What is the hottest day ever recorded in Ratchathewi?

The hottest day measured in Ratchathewi between 1940 and 2025 was 23 April 1990, reaching 40.4 °C.

What is the coldest day in Ratchathewi?

The coldest day measured in Ratchathewi between 1940 and 2025 was 12 January 1955, at 11.8 °C.

Does it snow in Ratchathewi?

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

Has the climate of Ratchathewi warmed?

Yes: Ratchathewi warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Ratchathewi?

The wettest day measured in Ratchathewi between 1940 and 2025 was 6 September 2012, with 160 mm of rain in 24 hours.

What was the windiest day in Ratchathewi?

The windiest day measured in Ratchathewi between 1940 and 2025 was 3 November 2009, with winds reaching 30.8 km/h.

What is the warmest month in Ratchathewi?

The warmest month in Ratchathewi is April (30.3 °C on average); the coldest is December (25.8 °C).

How much does it rain in Ratchathewi?

Ratchathewi receives on average 1,229 mm of precipitation per year, spread over about 175 rainy days.

Is it sunny in Ratchathewi?

Ratchathewi gets on average 10.0 hours of sunshine per day, roughly 3,650 hours per year over 1940-2025.

Are there tropical nights in Ratchathewi?

Yes: Ratchathewi has on average 344 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Ratchathewi?

In Ratchathewi, between 1940 and 2025, the highest apparent temperature reached 46.8 °C on 19 April 1953, and the lowest was 9.0 °C on 25 December 1999.

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