Arari climate — normals and trends

Q: What is the climate of Arari?

Arari has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.6 °C and it receives 1,697 mm of precipitation per year.

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

The hottest day measured in Arari between 1940 and 2025 was 12 December 1981, reaching 39.9 °C.

Q: What is the coldest day in Arari?

The coldest day measured in Arari between 1940 and 2025 was 22 August 2022, at 19.9 °C.

Q: Does it snow in Arari?

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

Q: Has the climate of Arari warmed?

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

Q: What is the wettest day in Arari?

The wettest day measured in Arari between 1940 and 2025 was 28 March 1959, with 261 mm of rain in 24 hours.

Q: What was the windiest day in Arari?

The windiest day measured in Arari between 1940 and 2025 was 16 August 1991, with winds reaching 25.9 km/h.

Q: What is the warmest month in Arari?

The warmest month in Arari is October (29.2 °C on average); the coldest is March (26.3 °C).

Q: How much does it rain in Arari?

Arari receives on average 1,697 mm of precipitation per year, spread over about 177 rainy days.

Q: Is it sunny in Arari?

Arari gets on average 10.7 hours of sunshine per day, roughly 3,905 hours per year over 1940-2025.

Arari (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 27.6 °C and it receives 1,697 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 October (29.2 °C on average) and the coldest is March (26.3 °C). Rainfall peaks in March.

Arari averages 0 frost days, 309 hot days (≥ 30 °C) and 177 rainy days per year.

Arari 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 39.9 °C (on 12 December 1981) and the coldest 19.9 °C (on 22 August 2022).

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

ArariMaranhão

coords: -3.45°, -44.78°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthOctoberColdest monthMarchWettest monthMarchDriest monthSeptember

Mean daily temperature

27.6°C

Average daily high

32.3°C

Average daily low

24.1°C

Annual rainfall

1,697mm

Sunshine / day

10.7h

Mean relative humidity

76%

Average peak wind

13.6km/h

Seasonal range

2.9°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

309 d/yr

Rainy days (≥ 1 mm)

177 d/yr

Annual snowfall

0.0 cm

Average feels-like high

37.0 °C

Average feels-like low

28.3 °C

Average peak gust

33.0 km/h

Tropical nights (≥ 20 °C)

364 d/yr

Solar radiation

19.0 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.0 °C

since 1940

+0.1 °C per decade · r² = 0.31 · 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

39.9 °C

12 December 1981

Coldest day

19.9 °C

22 August 2022

Wettest day

261 mm

28 March 1959

Windiest day

25.9 km/h

16 August 1991

Strongest gust

57.6 km/h

20 October 2005

Hottest feels-like

43.4 °C

25 October 2017

Coldest feels-like

20.1 °C

4 July 1974

Sunniest day

12.0 h

2 January 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	37.5 °C14 October 2025	20.9 °C14 July 2025	28.2 °C	1,442 mm	349
2024	37.7 °C13 October 2024	20.5 °C3 August 2024	28.4 °C	1,234 mm	347
2023	37.0 °C28 October 2023	21.5 °C21 July 2023	28.1 °C	1,325 mm	336
2022	37.8 °C31 October 2022	19.9 °C22 August 2022	27.7 °C	1,800 mm	327
2021	35.9 °C5 September 2021	20.8 °C3 August 2021	27.8 °C	1,490 mm	343
2020	37.9 °C15 October 2020	20.1 °C8 August 2020	28.0 °C	2,014 mm	345
2019	37.1 °C27 October 2019	21.5 °C19 July 2019	28.1 °C	2,231 mm	349
2018	37.5 °C17 September 2018	21.9 °C6 July 2018	27.8 °C	1,905 mm	340
2017	39.5 °C4 December 2017	21.6 °C19 July 2017	28.5 °C	1,640 mm	346
2016	39.0 °C25 November 2016	21.4 °C2 August 2016	28.7 °C	1,210 mm	353
2015	39.4 °C2 December 2015	21.6 °C15 July 2015	28.4 °C	1,323 mm	351
2014	37.9 °C27 October 2014	22.3 °C29 July 2014	28.1 °C	1,683 mm	345
2013	37.4 °C2 October 2013	22.2 °C11 July 2013	28.4 °C	1,539 mm	358
2012	39.1 °C24 October 2012	21.6 °C2 August 2012	28.5 °C	1,501 mm	350
2011	38.7 °C7 October 2011	21.5 °C29 July 2011	27.9 °C	2,021 mm	334
2010	38.2 °C15 October 2010	20.7 °C27 June 2010	28.7 °C	1,669 mm	354
2009	37.8 °C1 November 2009	21.8 °C27 July 2009	27.9 °C	2,416 mm	331
2008	38.0 °C25 November 2008	21.6 °C7 August 2008	28.0 °C	1,967 mm	331
2007	38.1 °C8 November 2007	21.5 °C22 June 2007	28.3 °C	1,406 mm	347
2006	38.4 °C8 October 2006	21.6 °C7 August 2006	28.1 °C	1,826 mm	337
2005	39.2 °C6 January 2005	21.9 °C15 July 2005	28.4 °C	1,444 mm	347
2004	38.0 °C4 December 2004	21.8 °C5 August 2004	27.9 °C	1,490 mm	336
2003	36.9 °C19 October 2003	21.4 °C16 July 2003	27.8 °C	1,710 mm	337
2002	37.8 °C22 October 2002	22.3 °C4 July 2002	27.8 °C	1,721 mm	330
2001	38.0 °C31 October 2001	20.4 °C3 August 2001	27.5 °C	1,863 mm	323
2000	37.9 °C29 November 2000	21.9 °C30 July 2000	27.3 °C	1,772 mm	333
1999	38.4 °C10 November 1999	21.5 °C9 January 1999	27.4 °C	2,141 mm	326
1998	37.6 °C5 October 1998	22.3 °C25 July 1998	28.2 °C	1,334 mm	348
1997	38.2 °C27 September 1997	20.9 °C10 July 1997	27.7 °C	1,382 mm	332
1996	37.4 °C11 November 1996	21.4 °C3 July 1996	27.4 °C	2,092 mm	323
1995	38.1 °C15 October 1995	21.1 °C14 July 1995	27.5 °C	1,964 mm	321
1994	36.4 °C1 December 1994	21.4 °C1 July 1994	27.4 °C	1,935 mm	317
1993	39.0 °C9 December 1993	22.2 °C19 July 1993	27.9 °C	1,341 mm	341
1992	37.9 °C13 January 1992	21.1 °C22 July 1992	28.0 °C	1,217 mm	337
1991	36.7 °C26 November 1991	21.1 °C30 July 1991	27.6 °C	1,516 mm	328
1990	36.3 °C1 November 1990	21.3 °C8 August 1990	27.6 °C	1,091 mm	337
1989	35.3 °C5 October 1989	22.3 °C15 January 1989	27.1 °C	2,069 mm	301
1988	36.8 °C22 November 1988	20.5 °C3 August 1988	27.4 °C	1,861 mm	318
1987	38.1 °C18 December 1987	22.9 °C5 January 1987	28.0 °C	1,360 mm	341
1986	36.6 °C11 November 1986	21.9 °C17 June 1986	27.1 °C	2,162 mm	295
1985	37.1 °C3 October 1985	21.5 °C5 July 1985	26.8 °C	2,770 mm	265
1984	37.3 °C17 December 1984	20.6 °C27 July 1984	26.9 °C	2,155 mm	305
1983	36.9 °C6 December 1983	22.9 °C14 August 1983	28.1 °C	1,028 mm	347
1982	38.4 °C17 December 1982	22.3 °C20 February 1982	27.6 °C	1,493 mm	325
1981	39.9 °C12 December 1981	21.5 °C28 July 1981	27.9 °C	1,217 mm	337
1980	38.0 °C6 December 1980	21.7 °C16 January 1980	27.4 °C	2,068 mm	323
1979	36.4 °C3 November 1979	21.4 °C19 June 1979	27.2 °C	1,932 mm	325
1978	35.7 °C21 November 1978	21.5 °C2 August 1978	27.0 °C	2,017 mm	302
1977	38.0 °C22 November 1977	21.5 °C24 July 1977	27.0 °C	2,576 mm	284
1976	35.6 °C23 September 1976	20.1 °C20 July 1976	26.8 °C	1,863 mm	290
1975	34.8 °C15 October 1975	20.1 °C28 July 1975	26.6 °C	2,005 mm	272
1974	35.8 °C25 October 1974	20.1 °C12 June 1974	26.3 °C	2,723 mm	246
1973	35.9 °C16 November 1973	21.7 °C20 January 1973	26.9 °C	2,340 mm	302
1972	36.5 °C16 November 1972	21.9 °C19 February 1972	27.0 °C	1,774 mm	312
1971	35.5 °C2 November 1971	20.4 °C11 July 1971	26.6 °C	2,112 mm	261
1970	35.1 °C8 January 1970	21.0 °C19 July 1970	27.2 °C	1,725 mm	319
1969	36.5 °C26 November 1969	21.5 °C30 July 1969	27.5 °C	1,264 mm	328
1968	37.0 °C18 October 1968	21.0 °C15 June 1968	26.8 °C	1,672 mm	269
1967	37.0 °C11 November 1967	21.5 °C17 February 1967	27.0 °C	1,995 mm	266
1966	37.6 °C9 October 1966	22.3 °C10 June 1966	27.3 °C	1,732 mm	256
1965	38.9 °C15 November 1965	21.9 °C27 July 1965	27.4 °C	1,165 mm	268
1964	38.2 °C9 November 1964	21.7 °C23 May 1964	27.0 °C	1,740 mm	224
1963	37.3 °C14 September 1963	21.8 °C26 July 1963	27.3 °C	1,728 mm	256
1962	38.3 °C3 October 1962	21.3 °C19 June 1962	27.2 °C	1,873 mm	267
1961	38.8 °C2 November 1961	21.7 °C7 February 1961	27.2 °C	1,962 mm	252
1960	38.9 °C8 December 1960	21.9 °C11 March 1960	27.4 °C	1,859 mm	270
1959	37.9 °C7 November 1959	21.8 °C28 May 1959	27.2 °C	2,240 mm	264
1958	38.8 °C26 October 1958	22.6 °C3 March 1958	28.2 °C	1,072 mm	342
1957	38.5 °C5 November 1957	22.0 °C2 February 1957	27.4 °C	1,537 mm	264
1956	37.5 °C29 October 1956	22.0 °C5 February 1956	27.1 °C	1,620 mm	263
1955	37.7 °C22 September 1955	21.6 °C15 July 1955	27.1 °C	1,642 mm	257
1954	38.0 °C17 October 1954	22.1 °C27 May 1954	27.2 °C	1,323 mm	281
1953	38.3 °C3 November 1953	22.3 °C13 July 1953	27.3 °C	1,480 mm	285
1952	37.8 °C9 October 1952	21.5 °C30 June 1952	27.2 °C	1,814 mm	264
1951	37.9 °C4 December 1951	22.3 °C4 April 1951	27.8 °C	1,027 mm	316
1950	39.4 °C29 November 1950	21.8 °C10 July 1950	27.4 °C	1,484 mm	258
1949	38.5 °C21 October 1949	21.9 °C24 July 1949	27.1 °C	1,700 mm	260
1948	38.4 °C6 November 1948	22.1 °C22 January 1948	27.5 °C	1,585 mm	294
1947	38.5 °C7 October 1947	21.9 °C29 December 1947	27.2 °C	1,829 mm	282
1946	39.8 °C12 December 1946	22.3 °C7 January 1946	27.9 °C	1,065 mm	320
1945	38.3 °C10 November 1945	21.7 °C3 June 1945	27.4 °C	1,337 mm	285
1944	38.9 °C3 November 1944	21.9 °C18 May 1944	27.7 °C	1,777 mm	264
1943	37.4 °C24 October 1943	21.8 °C13 March 1943	26.9 °C	1,726 mm	249
1942	39.3 °C20 November 1942	21.3 °C9 July 1942	28.0 °C	1,219 mm	337
1941	39.7 °C18 October 1941	22.3 °C15 June 1941	28.2 °C	919 mm	334
1940	37.3 °C1 December 1940	21.4 °C5 July 1940	27.2 °C	1,669 mm	265

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

33.0 °C

+0.7 °C

Hot days (≥ 30 °C)

349 d/yr

+40

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1442 mm

-255 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	32.0 °C	+0.7 °C	272 mm	+28 mm
Feb	31.1 °C	+0.4 °C	330 mm	+41 mm
Mar	31.4 °C	+1.0 °C	369 mm	-1 mm
Apr	31.9 °C	+1.4 °C	189 mm	-137 mm
May	31.7 °C	+0.9 °C	89 mm	-98 mm
Jun	31.7 °C	+0.7 °C	42 mm	-23 mm
Jul	32.6 °C	+0.7 °C	43 mm	+9 mm
Aug	33.6 °C	0.0 °C	15 mm	+1 mm
Sep	35.6 °C	+0.9 °C	2 mm	-9 mm
Oct	35.8 °C	+0.7 °C	4 mm	-13 mm
Nov	35.2 °C	+0.6 °C	7 mm	-29 mm
Dec	33.7 °C	+0.4 °C	82 mm	-26 mm

The year's extremes

Hottest day

37.5 °C

14 Oct 2025

Coldest day

20.9 °C

14 Jul 2025

Wettest day

47.2 mm

14 Feb 2025

Windiest day

22.7 km/h

26 Oct 2025

Strongest gust

50.4 km/h

29 Oct 2025

Hottest feels-like

41.4 °C

8 Apr 2025

Coldest feels-like

23.6 °C

14 Jul 2025

Sunniest day

12.0 h

1 Jan 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 Arari?

Arari has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.6 °C and it receives 1,697 mm of precipitation per year.

What is the hottest day ever recorded in Arari?

The hottest day measured in Arari between 1940 and 2025 was 12 December 1981, reaching 39.9 °C.

What is the coldest day in Arari?

The coldest day measured in Arari between 1940 and 2025 was 22 August 2022, at 19.9 °C.

Does it snow in Arari?

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

Has the climate of Arari warmed?

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

What is the wettest day in Arari?

The wettest day measured in Arari between 1940 and 2025 was 28 March 1959, with 261 mm of rain in 24 hours.

What was the windiest day in Arari?

The windiest day measured in Arari between 1940 and 2025 was 16 August 1991, with winds reaching 25.9 km/h.

What is the warmest month in Arari?

The warmest month in Arari is October (29.2 °C on average); the coldest is March (26.3 °C).

How much does it rain in Arari?

Arari receives on average 1,697 mm of precipitation per year, spread over about 177 rainy days.

Is it sunny in Arari?

Arari gets on average 10.7 hours of sunshine per day, roughly 3,905 hours per year over 1940-2025.

Are there tropical nights in Arari?

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

What was the most extreme apparent temperature in Arari?

In Arari, between 1940 and 2025, the highest apparent temperature reached 43.4 °C on 25 October 2017, and the lowest was 20.1 °C on 4 July 1974.

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