Açu climate — normals and trends

Q: What is the climate of Açu?

Açu has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 28.1 °C and it receives 412 mm of precipitation per year.

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

The hottest day measured in Açu between 1940 and 2025 was 8 May 1998, reaching 39.7 °C.

Q: What is the coldest day in Açu?

The coldest day measured in Açu between 1940 and 2025 was 5 August 1974, at 18.0 °C.

Q: Does it snow in Açu?

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

Q: Has the climate of Açu warmed?

Yes: Açu warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Açu?

The wettest day measured in Açu between 1940 and 2025 was 3 April 1971, with 172 mm of rain in 24 hours.

Q: What was the windiest day in Açu?

The windiest day measured in Açu between 1940 and 2025 was 3 November 2005, with winds reaching 35.2 km/h.

Q: What is the warmest month in Açu?

The warmest month in Açu is November (29.0 °C on average); the coldest is July (27.3 °C).

Q: How much does it rain in Açu?

Açu receives on average 412 mm of precipitation per year, spread over about 71 rainy days.

Q: Is it sunny in Açu?

Açu gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.

Açu (Brazil) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 28.1 °C and it receives 412 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 November (29.0 °C on average) and the coldest is July (27.3 °C). Rainfall peaks in March.

Açu averages 0 frost days, 347 hot days (≥ 30 °C) and 71 rainy days per year.

Açu has warmed by +1.0 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.

The hottest day of the period reached 39.7 °C (on 8 May 1998) and the coldest 18.0 °C (on 5 August 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

AçuRio Grande do Norte

coords: -5.58°, -36.91°
period: 1940–2025 · 86 yrs

BShHot semi-aridWarmest monthNovemberColdest monthJulyWettest monthMarchDriest monthSeptember

Mean daily temperature

28.1°C

Average daily high

34.0°C

Average daily low

23.3°C

Annual rainfall

412mm

Sunshine / day

10.9h

Mean relative humidity

63%

Average peak wind

21.7km/h

Seasonal range

1.7°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

347 d/yr

Rainy days (≥ 1 mm)

71 d/yr

Annual snowfall

0.0 cm

Average feels-like high

35.7 °C

Average feels-like low

25.8 °C

Average peak gust

39.8 km/h

Tropical nights (≥ 20 °C)

364 d/yr

Solar radiation

20.9 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.0 °C

since 1940

+0.1 °C per decade · r² = 0.28 · 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

39.7 °C

8 May 1998

Coldest day

18.0 °C

5 August 1974

Wettest day

172 mm

3 April 1971

Windiest day

35.2 km/h

3 November 2005

Strongest gust

60.5 km/h

3 November 2005

Hottest feels-like

42.4 °C

26 March 2013

Coldest feels-like

18.2 °C

5 August 1974

Sunniest day

12.3 h

28 December 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	37.7 °C4 November 2025	20.4 °C18 August 2025	28.7 °C	317 mm	364
2024	37.7 °C6 February 2024	19.8 °C25 July 2024	28.4 °C	505 mm	354
2023	37.5 °C4 February 2023	20.8 °C11 July 2023	28.5 °C	435 mm	360
2022	37.2 °C26 February 2022	19.2 °C26 July 2022	27.9 °C	596 mm	342
2021	38.3 °C10 February 2021	20.7 °C25 May 2021	28.8 °C	332 mm	360
2020	37.9 °C7 January 2020	19.6 °C22 July 2020	28.4 °C	527 mm	357
2019	39.1 °C12 January 2019	20.4 °C21 June 2019	28.5 °C	538 mm	352
2018	38.2 °C17 November 2018	19.8 °C17 July 2018	28.5 °C	565 mm	349
2017	38.1 °C6 February 2017	19.4 °C13 July 2017	28.5 °C	487 mm	351
2016	38.4 °C12 March 2016	20.7 °C29 June 2016	28.9 °C	375 mm	355
2015	37.6 °C17 January 2015	20.2 °C7 July 2015	28.7 °C	280 mm	357
2014	37.3 °C26 February 2014	20.0 °C31 July 2014	28.5 °C	369 mm	360
2013	38.2 °C8 February 2013	20.5 °C2 September 2013	29.0 °C	160 mm	361
2012	37.9 °C3 March 2012	19.9 °C17 July 2012	28.6 °C	165 mm	359
2011	36.9 °C23 October 2011	19.4 °C15 July 2011	27.6 °C	674 mm	335
2010	37.8 °C5 February 2010	19.9 °C14 August 2010	28.9 °C	206 mm	363
2009	37.1 °C7 November 2009	19.6 °C17 August 2009	27.5 °C	733 mm	336
2008	37.6 °C28 January 2008	19.4 °C5 July 2008	27.8 °C	584 mm	344
2007	37.8 °C19 October 2007	20.0 °C15 August 2007	28.3 °C	247 mm	354
2006	36.9 °C11 January 2006	20.7 °C14 July 2006	28.6 °C	306 mm	359
2005	38.1 °C7 March 2005	20.8 °C7 August 2005	28.6 °C	222 mm	356
2004	37.8 °C12 December 2004	21.3 °C24 August 2004	28.5 °C	561 mm	341
2003	37.6 °C17 February 2003	21.1 °C23 June 2003	28.6 °C	397 mm	355
2002	37.8 °C5 May 2002	20.9 °C25 August 2002	28.3 °C	358 mm	356
2001	37.8 °C20 February 2001	20.7 °C5 August 2001	28.8 °C	205 mm	357
2000	37.4 °C6 February 2000	19.8 °C12 August 2000	28.0 °C	514 mm	339
1999	38.1 °C17 February 1999	20.9 °C1 August 1999	28.7 °C	291 mm	359
1998	39.7 °C8 May 1998	20.3 °C21 July 1998	29.6 °C	196 mm	360
1997	38.9 °C6 October 1997	20.6 °C3 August 1997	28.5 °C	273 mm	356
1996	37.9 °C13 January 1996	19.2 °C8 August 1996	28.2 °C	582 mm	353
1995	38.4 °C15 January 1995	19.7 °C11 July 1995	28.0 °C	472 mm	344
1994	37.6 °C26 October 1994	20.5 °C15 August 1994	28.0 °C	489 mm	338
1993	38.5 °C18 November 1993	21.1 °C18 July 1993	29.3 °C	118 mm	362
1992	37.5 °C8 October 1992	20.4 °C23 August 1992	28.2 °C	290 mm	355
1991	37.9 °C27 January 1991	19.7 °C7 August 1991	27.9 °C	388 mm	355
1990	37.8 °C15 April 1990	21.2 °C11 August 1990	28.6 °C	189 mm	359
1989	37.6 °C13 November 1989	20.4 °C27 July 1989	27.8 °C	711 mm	337
1988	38.8 °C1 February 1988	20.5 °C2 August 1988	28.3 °C	398 mm	364
1987	38.3 °C6 November 1987	20.6 °C8 August 1987	28.7 °C	309 mm	362
1986	37.0 °C18 December 1986	19.3 °C1 August 1986	27.4 °C	785 mm	330
1985	37.2 °C18 November 1985	19.8 °C27 August 1985	27.0 °C	1,040 mm	314
1984	38.6 °C26 February 1984	19.2 °C27 July 1984	28.0 °C	494 mm	338
1983	38.1 °C25 February 1983	19.4 °C25 July 1983	28.7 °C	186 mm	362
1982	38.0 °C17 January 1982	20.3 °C13 July 1982	28.3 °C	220 mm	361
1981	38.0 °C8 October 1981	19.6 °C31 July 1981	28.2 °C	319 mm	350
1980	37.3 °C9 April 1980	20.2 °C19 July 1980	28.3 °C	380 mm	353
1979	37.5 °C10 October 1979	20.8 °C20 July 1979	28.4 °C	201 mm	361
1978	38.1 °C1 February 1978	20.2 °C8 August 1978	27.9 °C	484 mm	352
1977	36.8 °C17 November 1977	19.8 °C4 August 1977	27.7 °C	552 mm	351
1976	37.6 °C18 January 1976	19.4 °C31 July 1976	27.8 °C	372 mm	350
1975	37.7 °C9 November 1975	19.6 °C26 July 1975	27.5 °C	484 mm	346
1974	36.5 °C20 October 1974	18.0 °C5 August 1974	26.6 °C	1,106 mm	274
1973	37.8 °C30 August 1973	21.4 °C12 August 1973	27.8 °C	725 mm	337
1972	37.9 °C10 December 1972	21.0 °C16 September 1972	28.3 °C	298 mm	360
1971	37.4 °C2 January 1971	20.0 °C10 August 1971	27.6 °C	740 mm	335
1970	38.7 °C15 October 1970	21.1 °C14 August 1970	28.4 °C	308 mm	358
1969	38.1 °C27 February 1969	19.8 °C27 July 1969	28.6 °C	272 mm	361
1968	37.5 °C18 October 1968	19.9 °C3 July 1968	27.5 °C	417 mm	333
1967	37.4 °C2 January 1967	19.9 °C20 July 1967	27.0 °C	697 mm	312
1966	38.1 °C25 October 1966	21.0 °C5 August 1966	28.0 °C	373 mm	355
1965	37.8 °C17 October 1965	20.7 °C2 January 1965	27.5 °C	354 mm	347
1964	37.0 °C18 November 1964	20.6 °C11 July 1964	26.7 °C	694 mm	292
1963	37.9 °C1 October 1963	19.9 °C9 July 1963	27.8 °C	448 mm	347
1962	38.0 °C30 September 1962	20.7 °C17 August 1962	28.2 °C	233 mm	358
1961	37.7 °C2 January 1961	20.3 °C16 March 1961	27.6 °C	451 mm	333
1960	37.8 °C16 February 1960	21.0 °C20 September 1960	28.0 °C	430 mm	338
1959	37.7 °C28 October 1959	20.9 °C16 May 1959	27.5 °C	458 mm	342
1958	39.1 °C12 February 1958	20.8 °C2 November 1958	28.7 °C	115 mm	364
1957	37.8 °C30 November 1957	20.5 °C20 July 1957	27.4 °C	523 mm	323
1956	37.5 °C21 November 1956	20.4 °C27 July 1956	28.0 °C	242 mm	354
1955	37.7 °C17 March 1955	20.1 °C18 September 1955	27.4 °C	434 mm	325
1954	38.0 °C8 January 1954	20.5 °C18 September 1954	27.7 °C	329 mm	355
1953	38.0 °C30 January 1953	21.4 °C21 August 1953	28.6 °C	119 mm	363
1952	38.3 °C27 February 1952	21.0 °C13 September 1952	28.0 °C	325 mm	351
1951	37.4 °C15 March 1951	21.0 °C19 December 1951	28.2 °C	215 mm	360
1950	37.8 °C9 January 1950	21.2 °C21 May 1950	27.5 °C	412 mm	331
1949	38.1 °C9 December 1949	20.8 °C21 March 1949	27.4 °C	497 mm	332
1948	37.7 °C15 January 1948	21.1 °C28 April 1948	27.9 °C	340 mm	360
1947	37.6 °C1 January 1947	21.2 °C20 July 1947	27.8 °C	401 mm	339
1946	37.9 °C6 February 1946	20.7 °C1 July 1946	28.1 °C	227 mm	360
1945	37.5 °C28 January 1945	20.2 °C4 July 1945	27.4 °C	449 mm	338
1944	36.8 °C9 December 1944	19.9 °C24 June 1944	26.9 °C	713 mm	280
1943	38.3 °C19 February 1943	20.3 °C13 September 1943	27.4 °C	320 mm	344
1942	37.3 °C31 October 1942	19.4 °C9 July 1942	28.1 °C	175 mm	364
1941	37.5 °C12 January 1941	19.8 °C22 July 1941	28.1 °C	273 mm	357
1940	37.4 °C15 November 1940	19.1 °C31 March 1940	27.5 °C	410 mm	344

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

34.5 °C

+0.5 °C

Hot days (≥ 30 °C)

364 d/yr

+17

Frost days (< 0 °C)

0 d/yr

Annual rainfall

317 mm

-95 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	34.5 °C	0.0 °C	49 mm	+4 mm
Feb	34.6 °C	+0.9 °C	62 mm	-10 mm
Mar	33.2 °C	+0.6 °C	96 mm	-17 mm
Apr	34.6 °C	+2.2 °C	55 mm	-38 mm
May	34.3 °C	+1.3 °C	17 mm	-26 mm
Jun	33.5 °C	+0.6 °C	16 mm	-0 mm
Jul	33.2 °C	+0.2 °C	13 mm	+3 mm
Aug	34.1 °C	0.0 °C	7 mm	+5 mm
Sep	34.9 °C	-0.2 °C	1 mm	-0 mm
Oct	35.7 °C	0.0 °C	0 mm	-1 mm
Nov	36.0 °C	+0.3 °C	0 mm	-3 mm
Dec	35.5 °C	+0.2 °C	0 mm	-12 mm

The year's extremes

Hottest day

37.7 °C

4 Nov 2025

Coldest day

20.4 °C

18 Aug 2025

Wettest day

29.4 mm

1 Mar 2025

Windiest day

31.4 km/h

14 Nov 2025

Strongest gust

53.3 km/h

25 Oct 2025

Hottest feels-like

40.3 °C

27 Feb 2025

Coldest feels-like

21.2 °C

18 Aug 2025

Sunniest day

12.3 h

28 Dec 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 Açu?

Açu has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 28.1 °C and it receives 412 mm of precipitation per year.

What is the hottest day ever recorded in Açu?

The hottest day measured in Açu between 1940 and 2025 was 8 May 1998, reaching 39.7 °C.

What is the coldest day in Açu?

The coldest day measured in Açu between 1940 and 2025 was 5 August 1974, at 18.0 °C.

Does it snow in Açu?

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

Has the climate of Açu warmed?

Yes: Açu warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Açu?

The wettest day measured in Açu between 1940 and 2025 was 3 April 1971, with 172 mm of rain in 24 hours.

What was the windiest day in Açu?

The windiest day measured in Açu between 1940 and 2025 was 3 November 2005, with winds reaching 35.2 km/h.

What is the warmest month in Açu?

The warmest month in Açu is November (29.0 °C on average); the coldest is July (27.3 °C).

How much does it rain in Açu?

Açu receives on average 412 mm of precipitation per year, spread over about 71 rainy days.

Is it sunny in Açu?

Açu gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.

Are there tropical nights in Açu?

Yes: Açu has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Açu?

In Açu, between 1940 and 2025, the highest apparent temperature reached 42.4 °C on 26 March 2013, and the lowest was 18.2 °C on 5 August 1974.

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