Ratchaburi climate — normals and trends

Q: What is the climate of Ratchaburi?

Ratchaburi has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.6 °C and it receives 1,166 mm of precipitation per year.

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

The hottest day measured in Ratchaburi between 1940 and 2025 was 11 April 1994, reaching 40.3 °C.

Q: What is the coldest day in Ratchaburi?

The coldest day measured in Ratchaburi between 1940 and 2025 was 25 December 1999, at 11.8 °C.

Q: Does it snow in Ratchaburi?

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

Q: Has the climate of Ratchaburi warmed?

Yes: Ratchaburi warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Ratchaburi?

The wettest day measured in Ratchaburi between 1940 and 2025 was 26 May 1964, with 157 mm of rain in 24 hours.

Q: What was the windiest day in Ratchaburi?

The windiest day measured in Ratchaburi between 1940 and 2025 was 4 November 1997, with winds reaching 29.8 km/h.

Q: What is the warmest month in Ratchaburi?

The warmest month in Ratchaburi is April (30.0 °C on average); the coldest is December (25.0 °C).

Q: How much does it rain in Ratchaburi?

Ratchaburi receives on average 1,166 mm of precipitation per year, spread over about 171 rainy days.

Q: Is it sunny in Ratchaburi?

Ratchaburi gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.

Ratchaburi (Thailand) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 27.6 °C and it receives 1,166 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 (30.0 °C on average) and the coldest is December (25.0 °C). Rainfall peaks in October.

Ratchaburi averages 0 frost days, 298 hot days (≥ 30 °C) and 171 rainy days per year.

Ratchaburi has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.

The hottest day of the period reached 40.3 °C (on 11 April 1994) and the coldest 11.8 °C (on 25 December 1999).

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

RatchaburiRatchaburi

coords: 13.54°, 99.82°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthAprilColdest monthDecemberWettest monthOctoberDriest monthDecember

Mean daily temperature

27.6°C

Average daily high

32.3°C

Average daily low

24.0°C

Annual rainfall

1,166mm

Sunshine / day

9.8h

Mean relative humidity

73%

Average peak wind

12.2km/h

Seasonal range

5.0°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

298 d/yr

Rainy days (≥ 1 mm)

171 d/yr

Annual snowfall

0.0 cm

Average feels-like high

37.0 °C

Average feels-like low

28.0 °C

Average peak gust

29.7 km/h

Tropical nights (≥ 20 °C)

337 d/yr

Solar radiation

18.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.3 °C

since 1940

+0.3 °C per decade · r² = 0.73 · 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

40.3 °C

11 April 1994

Coldest day

11.8 °C

25 December 1999

Wettest day

157 mm

26 May 1964

Windiest day

29.8 km/h

4 November 1997

Strongest gust

63.0 km/h

26 June 1992

Hottest feels-like

47.6 °C

25 April 2019

Coldest feels-like

8.9 °C

25 December 1999

Sunniest day

12.8 h

6 July 1942

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	38.3 °C26 April 2025	16.3 °C29 November 2025	28.0 °C	1,212 mm	310
2024	38.0 °C30 April 2024	18.9 °C21 December 2024	29.0 °C	1,084 mm	345
2023	39.4 °C6 May 2023	18.1 °C31 January 2023	28.7 °C	997 mm	336
2022	38.8 °C15 April 2022	18.4 °C20 December 2022	28.1 °C	1,438 mm	317
2021	39.1 °C14 May 2021	15.9 °C13 January 2021	28.1 °C	1,205 mm	313
2020	38.9 °C6 May 2020	18.4 °C22 December 2020	28.7 °C	1,053 mm	333
2019	40.2 °C3 May 2019	17.2 °C7 December 2019	28.7 °C	994 mm	340
2018	38.8 °C14 April 2018	18.4 °C14 January 2018	28.3 °C	1,344 mm	329
2017	39.9 °C26 April 2017	16.0 °C20 December 2017	28.5 °C	1,197 mm	325
2016	38.9 °C13 May 2016	15.6 °C25 January 2016	28.8 °C	978 mm	338
2015	39.2 °C21 April 2015	16.5 °C17 January 2015	28.6 °C	884 mm	341
2014	38.5 °C20 April 2014	13.1 °C25 January 2014	28.0 °C	1,127 mm	318
2013	38.8 °C11 May 2013	14.8 °C28 December 2013	27.9 °C	1,318 mm	305
2012	39.2 °C30 April 2012	20.3 °C9 January 2012	28.5 °C	1,147 mm	335
2011	38.1 °C18 April 2011	17.3 °C12 December 2011	27.6 °C	1,077 mm	302
2010	38.9 °C14 May 2010	18.6 °C18 December 2010	28.7 °C	1,014 mm	330
2009	38.8 °C24 April 2009	14.5 °C12 January 2009	28.2 °C	982 mm	336
2008	37.3 °C17 April 2008	17.9 °C10 December 2008	27.8 °C	1,166 mm	315
2007	39.8 °C22 April 2007	16.5 °C5 February 2007	28.5 °C	1,119 mm	336
2006	39.3 °C12 April 2006	16.4 °C24 December 2006	28.7 °C	1,059 mm	343
2005	39.3 °C10 April 2005	16.7 °C3 January 2005	28.5 °C	1,182 mm	318
2004	39.6 °C15 April 2004	17.4 °C16 February 2004	28.6 °C	746 mm	344
2003	40.2 °C7 May 2003	17.6 °C22 December 2003	28.5 °C	1,108 mm	332
2002	39.2 °C10 April 2002	18.6 °C4 January 2002	28.7 °C	1,098 mm	336
2001	40.1 °C23 April 2001	17.1 °C24 December 2001	28.3 °C	1,126 mm	318
2000	37.7 °C1 August 2000	16.5 °C4 February 2000	28.1 °C	1,038 mm	335
1999	39.0 °C18 March 1999	11.8 °C25 December 1999	27.6 °C	1,437 mm	303
1998	40.2 °C24 April 1998	18.1 °C17 December 1998	29.1 °C	913 mm	339
1997	39.9 °C5 May 1997	16.1 °C5 January 1997	28.6 °C	849 mm	344
1996	39.6 °C31 March 1996	14.3 °C1 January 1996	27.9 °C	1,569 mm	299
1995	40.1 °C15 April 1995	15.0 °C30 December 1995	28.3 °C	1,202 mm	324
1994	40.3 °C11 April 1994	17.6 °C27 January 1994	28.4 °C	980 mm	338
1993	39.3 °C28 March 1993	15.0 °C31 January 1993	28.2 °C	822 mm	333
1992	39.6 °C10 May 1992	15.4 °C20 January 1992	27.9 °C	966 mm	301
1991	39.9 °C19 May 1991	18.6 °C15 February 1991	28.3 °C	1,028 mm	325
1990	39.9 °C12 April 1990	16.7 °C6 December 1990	28.7 °C	771 mm	347
1989	39.3 °C19 April 1989	16.8 °C4 December 1989	28.1 °C	958 mm	321
1988	38.7 °C7 April 1988	16.8 °C14 December 1988	28.1 °C	1,122 mm	305
1987	39.1 °C11 April 1987	15.7 °C9 December 1987	28.3 °C	851 mm	318
1986	38.2 °C16 April 1986	15.0 °C7 January 1986	27.5 °C	938 mm	301
1985	38.5 °C14 April 1985	16.0 °C18 December 1985	27.4 °C	1,136 mm	304
1984	37.5 °C21 April 1984	14.2 °C10 January 1984	27.4 °C	804 mm	306
1983	37.3 °C21 May 1983	14.8 °C25 January 1983	27.5 °C	1,098 mm	293
1982	39.0 °C29 April 1982	14.1 °C29 December 1982	27.4 °C	913 mm	304
1981	38.7 °C28 April 1981	15.1 °C19 January 1981	27.3 °C	1,237 mm	282
1980	40.0 °C26 April 1980	16.5 °C29 January 1980	28.0 °C	1,021 mm	327
1979	39.6 °C20 April 1979	17.0 °C27 December 1979	28.3 °C	782 mm	338
1978	38.0 °C30 April 1978	16.5 °C16 December 1978	27.6 °C	1,284 mm	310
1977	36.8 °C4 May 1977	16.6 °C6 March 1977	27.7 °C	732 mm	326
1976	38.2 °C17 April 1976	12.7 °C1 January 1976	26.8 °C	1,363 mm	284
1975	38.3 °C17 April 1975	12.3 °C31 December 1975	26.8 °C	1,652 mm	282
1974	38.3 °C22 April 1974	13.5 °C4 January 1974	26.8 °C	1,585 mm	266
1973	39.3 °C23 April 1973	13.3 °C27 December 1973	27.4 °C	1,168 mm	286
1972	39.1 °C4 May 1972	14.2 °C16 January 1972	27.2 °C	1,418 mm	289
1971	38.5 °C24 April 1971	14.4 °C17 November 1971	26.7 °C	1,236 mm	269
1970	39.9 °C9 May 1970	17.6 °C18 December 1970	27.4 °C	1,279 mm	289
1969	38.6 °C5 May 1969	16.0 °C5 December 1969	27.9 °C	1,118 mm	292
1968	37.3 °C27 May 1968	15.4 °C6 January 1968	27.5 °C	951 mm	331
1967	39.9 °C2 May 1967	14.2 °C17 January 1967	27.1 °C	1,027 mm	279
1966	36.8 °C27 April 1966	16.1 °C2 January 1966	26.6 °C	1,533 mm	220
1965	38.5 °C30 April 1965	13.9 °C22 January 1965	27.0 °C	1,396 mm	278
1964	37.0 °C1 May 1964	15.0 °C19 December 1964	26.9 °C	1,297 mm	268
1963	38.6 °C17 May 1963	12.6 °C16 January 1963	26.8 °C	1,292 mm	251
1962	37.8 °C6 May 1962	15.0 °C6 December 1962	26.9 °C	1,174 mm	263
1961	37.5 °C24 March 1961	13.3 °C19 January 1961	27.1 °C	1,087 mm	283
1960	39.2 °C27 April 1960	13.0 °C4 January 1960	27.5 °C	1,145 mm	296
1959	38.8 °C27 April 1959	17.3 °C1 January 1959	27.6 °C	1,031 mm	288
1958	37.9 °C27 May 1958	17.0 °C7 December 1958	27.3 °C	889 mm	273
1957	38.6 °C20 April 1957	13.3 °C6 February 1957	27.2 °C	1,581 mm	282
1956	36.5 °C28 March 1956	13.4 °C17 January 1956	26.6 °C	1,246 mm	257
1955	37.3 °C11 May 1955	12.1 °C12 January 1955	26.6 °C	1,502 mm	255
1954	37.4 °C18 April 1954	13.9 °C17 December 1954	27.1 °C	917 mm	299
1953	35.4 °C17 April 1953	15.1 °C13 December 1953	25.9 °C	2,392 mm	201
1952	39.4 °C30 April 1952	14.0 °C12 December 1952	26.9 °C	1,630 mm	249
1951	38.2 °C10 April 1951	15.8 °C2 January 1951	27.1 °C	1,119 mm	279
1950	37.1 °C23 April 1950	15.2 °C3 January 1950	26.8 °C	1,213 mm	275
1949	37.0 °C23 May 1949	14.5 °C17 January 1949	26.9 °C	953 mm	273
1948	37.6 °C12 March 1948	15.4 °C3 January 1948	26.7 °C	1,208 mm	253
1947	38.0 °C8 May 1947	16.1 °C30 December 1947	27.3 °C	1,003 mm	283
1946	37.6 °C27 March 1946	15.2 °C9 January 1946	26.7 °C	1,073 mm	272
1945	36.6 °C3 March 1945	15.3 °C31 December 1945	26.4 °C	1,477 mm	225
1944	37.7 °C8 April 1944	14.3 °C21 December 1944	26.8 °C	1,414 mm	248
1943	36.2 °C24 March 1943	15.4 °C20 January 1943	26.0 °C	1,424 mm	204
1942	36.8 °C17 April 1942	14.5 °C18 December 1942	26.4 °C	1,243 mm	252
1941	38.2 °C29 April 1941	16.3 °C24 January 1941	26.6 °C	1,636 mm	202
1940	38.7 °C11 March 1940	13.9 °C4 January 1940	26.3 °C	1,511 mm	207

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

32.3 °C

0.0 °C

Hot days (≥ 30 °C)

310 d/yr

+12

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1212 mm

+46 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	29.8 °C	-1.0 °C	1 mm	-12 mm
Feb	32.2 °C	-0.6 °C	36 mm	+14 mm
Mar	33.9 °C	-0.5 °C	28 mm	-6 mm
Apr	35.5 °C	0.0 °C	65 mm	+2 mm
May	33.8 °C	-0.4 °C	185 mm	+49 mm
Jun	33.7 °C	+0.7 °C	90 mm	-36 mm
Jul	32.8 °C	+0.5 °C	133 mm	-10 mm
Aug	33.4 °C	+1.4 °C	134 mm	-16 mm
Sep	32.0 °C	+0.4 °C	282 mm	+83 mm
Oct	31.3 °C	+0.6 °C	149 mm	-53 mm
Nov	29.5 °C	-0.7 °C	104 mm	+36 mm
Dec	30.3 °C	+0.4 °C	6 mm	-6 mm

The year's extremes

Hottest day

38.3 °C

26 Apr 2025

Coldest day

16.3 °C

29 Nov 2025

Wettest day

61.7 mm

7 Sep 2025

Windiest day

20.0 km/h

27 Nov 2025

Strongest gust

53.3 km/h

23 Jul 2025

Hottest feels-like

45.6 °C

26 Apr 2025

Coldest feels-like

15.8 °C

29 Nov 2025

Sunniest day

12.6 h

1 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 Ratchaburi?

Ratchaburi has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.6 °C and it receives 1,166 mm of precipitation per year.

What is the hottest day ever recorded in Ratchaburi?

The hottest day measured in Ratchaburi between 1940 and 2025 was 11 April 1994, reaching 40.3 °C.

What is the coldest day in Ratchaburi?

The coldest day measured in Ratchaburi between 1940 and 2025 was 25 December 1999, at 11.8 °C.

Does it snow in Ratchaburi?

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

Has the climate of Ratchaburi warmed?

Yes: Ratchaburi warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Ratchaburi?

The wettest day measured in Ratchaburi between 1940 and 2025 was 26 May 1964, with 157 mm of rain in 24 hours.

What was the windiest day in Ratchaburi?

The windiest day measured in Ratchaburi between 1940 and 2025 was 4 November 1997, with winds reaching 29.8 km/h.

What is the warmest month in Ratchaburi?

The warmest month in Ratchaburi is April (30.0 °C on average); the coldest is December (25.0 °C).

How much does it rain in Ratchaburi?

Ratchaburi receives on average 1,166 mm of precipitation per year, spread over about 171 rainy days.

Is it sunny in Ratchaburi?

Ratchaburi gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.

Are there tropical nights in Ratchaburi?

Yes: Ratchaburi has on average 337 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Ratchaburi?

In Ratchaburi, between 1940 and 2025, the highest apparent temperature reached 47.6 °C on 25 April 2019, and the lowest was 8.9 °C on 25 December 1999.

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