Porto Nacional climate — normals and trends

Q: What is the climate of Porto Nacional?

Porto Nacional has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.6 °C and it receives 1,643 mm of precipitation per year.

Q: What is the hottest day ever recorded in Porto Nacional?

The hottest day measured in Porto Nacional between 1940 and 2025 was 29 October 1963, reaching 41.3 °C.

Q: What is the coldest day in Porto Nacional?

The coldest day measured in Porto Nacional between 1940 and 2025 was 20 May 2022, at 14.6 °C.

Q: Does it snow in Porto Nacional?

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

Q: Has the climate of Porto Nacional warmed?

Yes: Porto Nacional warmed by +0.5 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Porto Nacional?

The wettest day measured in Porto Nacional between 1940 and 2025 was 25 November 1954, with 152 mm of rain in 24 hours.

Q: What was the windiest day in Porto Nacional?

The windiest day measured in Porto Nacional between 1940 and 2025 was 14 September 1965, with winds reaching 24.6 km/h.

Q: What is the warmest month in Porto Nacional?

The warmest month in Porto Nacional is September (29.4 °C on average); the coldest is February (25.4 °C).

Q: How much does it rain in Porto Nacional?

Porto Nacional receives on average 1,643 mm of precipitation per year, spread over about 169 rainy days.

Q: Is it sunny in Porto Nacional?

Porto Nacional gets on average 10.1 hours of sunshine per day, roughly 3,687 hours per year over 1940-2025.

Porto Nacional (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.6 °C and it receives 1,643 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 September (29.4 °C on average) and the coldest is February (25.4 °C). Rainfall peaks in January.

Porto Nacional averages 0 frost days, 266 hot days (≥ 30 °C) and 169 rainy days per year.

Porto Nacional has warmed by +0.5 °C between 1940 and 2025, or +0.06 °C per decade. This trend is statistically significant.

The hottest day of the period reached 41.3 °C (on 29 October 1963) and the coldest 14.6 °C (on 20 May 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

Porto NacionalTocantins

coords: -10.71°, -48.42°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthSeptemberColdest monthFebruaryWettest monthJanuaryDriest monthJuly

Mean daily temperature

26.6°C

Average daily high

31.8°C

Average daily low

22.3°C

Annual rainfall

1,643mm

Sunshine / day

10.1h

Mean relative humidity

68%

Average peak wind

10.5km/h

Seasonal range

4.0°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

266 d/yr

Rainy days (≥ 1 mm)

169 d/yr

Annual snowfall

0.0 cm

Average feels-like high

35.7 °C

Average feels-like low

24.9 °C

Average peak gust

28.4 km/h

Tropical nights (≥ 20 °C)

341 d/yr

Solar radiation

19.2 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.5 °C

since 1940

+0.1 °C per decade · r² = 0.07 · p = 0.013

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

41.3 °C

29 October 1963

Coldest day

14.6 °C

20 May 2022

Wettest day

152 mm

25 November 1954

Windiest day

24.6 km/h

14 September 1965

Strongest gust

60.1 km/h

28 December 1967

Hottest feels-like

44.5 °C

10 February 1996

Coldest feels-like

13.2 °C

19 May 2022

Sunniest day

12.6 h

5 January 2021

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	39.4 °C11 September 2025	15.4 °C18 July 2025	26.7 °C	1,267 mm	306
2024	40.4 °C3 October 2024	15.1 °C8 August 2024	27.0 °C	1,274 mm	316
2023	38.8 °C1 October 2023	16.4 °C3 July 2023	26.9 °C	1,074 mm	317
2022	38.5 °C15 September 2022	14.6 °C20 May 2022	26.5 °C	1,391 mm	277
2021	39.6 °C20 September 2021	15.6 °C28 June 2021	26.4 °C	1,653 mm	266
2020	40.0 °C4 October 2020	15.9 °C21 July 2020	26.8 °C	1,303 mm	298
2019	39.9 °C13 September 2019	19.3 °C26 July 2019	27.5 °C	1,255 mm	312
2018	38.4 °C3 September 2018	17.9 °C26 June 2018	27.1 °C	1,613 mm	297
2017	40.6 °C21 October 2017	18.0 °C2 August 2017	27.6 °C	1,612 mm	305
2016	39.2 °C18 August 2016	19.6 °C29 July 2016	28.2 °C	1,536 mm	321
2015	39.9 °C4 October 2015	19.2 °C4 August 2015	27.6 °C	1,339 mm	310
2014	38.7 °C17 October 2014	19.5 °C6 July 2014	27.1 °C	1,364 mm	288
2013	38.6 °C23 September 2013	19.2 °C7 July 2013	27.3 °C	1,790 mm	299
2012	38.9 °C14 September 2012	18.0 °C30 July 2012	27.0 °C	1,503 mm	294
2011	38.8 °C23 September 2011	18.1 °C23 July 2011	26.7 °C	1,867 mm	282
2010	38.5 °C16 September 2010	18.7 °C16 June 2010	27.5 °C	1,646 mm	316
2009	37.8 °C5 September 2009	18.6 °C3 July 2009	26.6 °C	1,877 mm	279
2008	39.2 °C16 October 2008	17.8 °C22 July 2008	26.8 °C	1,633 mm	273
2007	39.2 °C17 September 2007	18.2 °C24 June 2007	27.2 °C	1,336 mm	305
2006	38.2 °C29 August 2006	17.6 °C23 July 2006	26.6 °C	1,716 mm	287
2005	39.5 °C21 September 2005	18.3 °C2 August 2005	26.9 °C	1,818 mm	291
2004	38.3 °C28 August 2004	17.7 °C14 June 2004	26.8 °C	1,746 mm	285
2003	38.1 °C18 September 2003	17.2 °C7 July 2003	26.7 °C	1,478 mm	290
2002	37.5 °C14 September 2002	18.1 °C28 May 2002	27.0 °C	1,396 mm	302
2001	38.0 °C10 September 2001	19.1 °C27 July 2001	26.5 °C	1,540 mm	288
2000	37.1 °C29 August 2000	18.5 °C17 June 2000	26.4 °C	1,578 mm	283
1999	38.5 °C5 September 1999	18.9 °C28 July 1999	26.7 °C	1,591 mm	280
1998	39.4 °C16 September 1998	18.5 °C1 July 1998	27.7 °C	1,545 mm	321
1997	38.0 °C8 November 1997	17.7 °C25 June 1997	26.3 °C	1,668 mm	279
1996	38.2 °C25 September 1996	17.3 °C27 July 1996	26.5 °C	1,784 mm	282
1995	38.4 °C30 September 1995	18.3 °C8 June 1995	26.5 °C	1,946 mm	271
1994	37.5 °C4 October 1994	17.1 °C31 July 1994	26.5 °C	1,720 mm	285
1993	36.8 °C11 August 1993	18.1 °C26 June 1993	26.6 °C	1,508 mm	296
1992	37.2 °C24 August 1992	17.3 °C24 July 1992	26.3 °C	1,938 mm	267
1991	36.7 °C12 September 1991	16.8 °C21 July 1991	26.2 °C	1,643 mm	281
1990	36.8 °C19 August 1990	18.7 °C11 June 1990	26.9 °C	1,303 mm	301
1989	37.3 °C3 September 1989	18.1 °C20 July 1989	25.9 °C	2,205 mm	234
1988	38.2 °C2 September 1988	16.7 °C20 June 1988	26.5 °C	1,749 mm	266
1987	38.2 °C4 September 1987	19.1 °C27 July 1987	27.0 °C	1,800 mm	283
1986	36.8 °C22 September 1986	17.5 °C8 June 1986	26.3 °C	1,560 mm	261
1985	37.1 °C28 August 1985	16.8 °C10 June 1985	25.8 °C	2,211 mm	216
1984	36.4 °C15 August 1984	17.6 °C13 June 1984	26.2 °C	1,626 mm	265
1983	38.2 °C25 September 1983	19.0 °C28 June 1983	26.9 °C	1,846 mm	278
1982	37.2 °C20 August 1982	19.5 °C7 July 1982	26.5 °C	1,748 mm	277
1981	37.8 °C17 September 1981	17.2 °C17 July 1981	26.2 °C	1,599 mm	270
1980	37.2 °C27 August 1980	18.7 °C11 July 1980	26.4 °C	2,014 mm	255
1979	36.2 °C16 August 1979	17.3 °C25 June 1979	25.9 °C	2,093 mm	248
1978	36.9 °C30 August 1978	16.9 °C23 June 1978	25.9 °C	1,756 mm	237
1977	36.2 °C10 August 1977	17.8 °C1 July 1977	26.0 °C	2,006 mm	248
1976	35.7 °C9 August 1976	16.8 °C26 June 1976	25.7 °C	1,962 mm	246
1975	36.1 °C19 September 1975	18.1 °C25 May 1975	25.8 °C	1,828 mm	243
1974	36.6 °C30 August 1974	16.6 °C5 August 1974	25.5 °C	1,954 mm	224
1973	36.9 °C30 August 1973	19.5 °C10 June 1973	26.6 °C	1,648 mm	272
1972	36.5 °C29 August 1972	18.0 °C22 July 1972	26.5 °C	1,688 mm	266
1971	35.9 °C14 August 1971	18.1 °C21 July 1971	25.8 °C	2,125 mm	225
1970	36.8 °C19 September 1970	17.8 °C25 July 1970	26.5 °C	1,448 mm	280
1969	37.1 °C13 September 1969	17.6 °C18 July 1969	26.8 °C	1,176 mm	294
1968	38.1 °C19 September 1968	16.9 °C29 June 1968	25.8 °C	1,565 mm	239
1967	36.8 °C25 September 1967	15.6 °C24 July 1967	26.0 °C	1,396 mm	250
1966	38.5 °C17 September 1966	18.4 °C11 June 1966	26.1 °C	2,048 mm	213
1965	39.1 °C22 September 1965	17.3 °C20 July 1965	26.3 °C	1,895 mm	230
1964	37.7 °C11 September 1964	15.7 °C3 June 1964	25.7 °C	2,094 mm	197
1963	41.3 °C29 October 1963	16.8 °C13 July 1963	26.8 °C	1,657 mm	226
1962	39.0 °C21 September 1962	17.9 °C17 July 1962	26.4 °C	1,825 mm	217
1961	40.1 °C24 October 1961	18.2 °C9 July 1961	27.2 °C	1,180 mm	267
1960	40.1 °C24 September 1960	18.6 °C22 May 1960	26.7 °C	1,893 mm	247
1959	39.5 °C20 October 1959	17.8 °C1 July 1959	27.0 °C	1,607 mm	247
1958	39.9 °C4 October 1958	19.7 °C18 August 1958	28.0 °C	1,367 mm	302
1957	40.3 °C18 September 1957	17.6 °C2 June 1957	27.2 °C	1,781 mm	238
1956	38.5 °C26 September 1956	17.0 °C7 June 1956	26.1 °C	1,965 mm	192
1955	40.1 °C18 September 1955	18.5 °C8 July 1955	26.7 °C	1,467 mm	237
1954	38.8 °C20 September 1954	18.6 °C15 July 1954	26.8 °C	1,538 mm	262
1953	37.5 °C24 August 1953	18.1 °C17 July 1953	26.6 °C	1,579 mm	245
1952	38.2 °C10 October 1952	18.2 °C5 June 1952	26.5 °C	1,659 mm	218
1951	39.4 °C30 September 1951	18.8 °C24 June 1951	26.6 °C	1,345 mm	235
1950	39.0 °C8 September 1950	18.6 °C2 July 1950	26.9 °C	1,239 mm	259
1949	39.7 °C22 September 1949	18.4 °C11 July 1949	26.9 °C	1,127 mm	252
1948	37.9 °C10 September 1948	19.6 °C22 June 1948	26.5 °C	1,376 mm	245
1947	38.4 °C30 August 1947	18.5 °C15 July 1947	26.1 °C	2,033 mm	207
1946	38.6 °C24 September 1946	17.8 °C20 July 1946	26.7 °C	1,561 mm	257
1945	38.6 °C25 September 1945	18.5 °C16 June 1945	26.4 °C	1,561 mm	207
1944	38.9 °C9 October 1944	18.3 °C31 May 1944	26.5 °C	2,027 mm	234
1943	37.5 °C21 September 1943	18.2 °C19 June 1943	25.7 °C	2,038 mm	188
1942	39.4 °C7 October 1942	18.5 °C17 July 1942	27.5 °C	1,249 mm	298
1941	41.2 °C22 October 1941	19.9 °C21 June 1941	27.8 °C	1,330 mm	293
1940	37.4 °C13 December 1940	18.0 °C6 July 1940	26.2 °C	1,580 mm	231

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

32.8 °C

+1.0 °C

Hot days (≥ 30 °C)

306 d/yr

+40

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1267 mm

-376 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	29.8 °C	0.0 °C	325 mm	+36 mm
Feb	30.3 °C	+0.6 °C	210 mm	-51 mm
Mar	31.2 °C	+1.5 °C	123 mm	-136 mm
Apr	31.4 °C	+1.0 °C	147 mm	-6 mm
May	32.7 °C	+1.1 °C	19 mm	-17 mm
Jun	33.8 °C	+1.3 °C	0 mm	-3 mm
Jul	33.9 °C	+0.9 °C	0 mm	-1 mm
Aug	35.6 °C	+0.8 °C	0 mm	-2 mm
Sep	36.4 °C	+0.9 °C	11 mm	-11 mm
Oct	35.0 °C	+1.7 °C	39 mm	-85 mm
Nov	32.1 °C	+1.1 °C	134 mm	-90 mm
Dec	30.7 °C	+0.5 °C	259 mm	-9 mm

The year's extremes

Hottest day

39.4 °C

11 Sep 2025

Coldest day

15.4 °C

18 Jul 2025

Wettest day

73.0 mm

13 Jan 2025

Windiest day

20.7 km/h

4 Oct 2025

Strongest gust

48.6 km/h

12 Sep 2025

Hottest feels-like

42.3 °C

13 Mar 2025

Coldest feels-like

14.1 °C

22 Aug 2025

Sunniest day

12.5 h

19 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 Porto Nacional?

Porto Nacional has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.6 °C and it receives 1,643 mm of precipitation per year.

What is the hottest day ever recorded in Porto Nacional?

The hottest day measured in Porto Nacional between 1940 and 2025 was 29 October 1963, reaching 41.3 °C.

What is the coldest day in Porto Nacional?

The coldest day measured in Porto Nacional between 1940 and 2025 was 20 May 2022, at 14.6 °C.

Does it snow in Porto Nacional?

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

Has the climate of Porto Nacional warmed?

Yes: Porto Nacional warmed by +0.5 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Porto Nacional?

The wettest day measured in Porto Nacional between 1940 and 2025 was 25 November 1954, with 152 mm of rain in 24 hours.

What was the windiest day in Porto Nacional?

The windiest day measured in Porto Nacional between 1940 and 2025 was 14 September 1965, with winds reaching 24.6 km/h.

What is the warmest month in Porto Nacional?

The warmest month in Porto Nacional is September (29.4 °C on average); the coldest is February (25.4 °C).

How much does it rain in Porto Nacional?

Porto Nacional receives on average 1,643 mm of precipitation per year, spread over about 169 rainy days.

Is it sunny in Porto Nacional?

Porto Nacional gets on average 10.1 hours of sunshine per day, roughly 3,687 hours per year over 1940-2025.

Are there tropical nights in Porto Nacional?

Yes: Porto Nacional has on average 341 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Porto Nacional?

In Porto Nacional, between 1940 and 2025, the highest apparent temperature reached 44.5 °C on 10 February 1996, and the lowest was 13.2 °C on 19 May 2022.

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