Rio Tinto weather in September

In September, Rio Tinto sees average daytime highs of 27°C and overnight lows near 23°C, with 47 mm of rain across 16.7 wet days and about 12 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 68% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 54 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Rio Tinto's 1st-clearest and 2nd-windiest month. For the whole year in context, see Rio Tinto's year-round climate.

Daytime high: 27°; 9th warmest
Overnight low: 23°; 3rd coldest
Rainfall: 47 mm; 16.7 wet days
Daylight: 12 hours; 5:16 AM – 5:14 PM
Cloud cover: 37%; 1st clearest
Wind: 22 km/h; 2nd windiest
Solar energy: 5.71 kWh/m²
Travel score: 5.9; out of 10

Rio Tinto is human settlement in Brazil.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Rio Tinto year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical September day in Rio Tinto reaches about 27°C in the afternoon and slips back to 23°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 27°C. Set against its neighbours, September runs on par with August and on par with October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27
Avg low (°C)	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	24	24	24	24	24	24	24	24

	Avg high (°C)	Avg low (°C)
1	27	23
2	27	23
3	27	23
4	27	23
5	27	23
6	27	23
7	27	23
8	27	23
9	27	23
10	27	23
11	27	23
12	27	23
13	27	23
14	27	23
15	27	23
16	27	23
17	27	23
18	27	23
19	27	23
20	27	23
21	27	23
22	27	23
23	27	24
24	27	24
25	27	24
26	27	24
27	27	24
28	27	24
29	27	24
30	27	24

Rio Tinto weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 9th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 25°	71	18.6	12.4	4.9
Feb	28° / 25°	87	19.4	12.2	4.4
Mar	29° / 25°	119	21.8	12	4.3
Apr	28° / 25°	163	24.1	11.9	4.0
May	28° / 24°	164	24.2	11.7	4.5
Jun	27° / 24°	178	24.1	11.6	4.6
Jul	26° / 23°	157	24.9	11.6	4.7
Aug	26° / 23°	77	20.9	11.8	5.3
Sep	27° / 23°	47	16.7	12	5.9
Oct	27° / 24°	32	14	12.2	6.2
Nov	28° / 25°	28	11.4	12.3	6.3
Dec	28° / 25°	42	14.5	12.4	5.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 68% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 9%. Skies tend to open up as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	89	89	89	89	89	89	89	90	90	90	90	90	91	91	92	92	92	92	92	93	93	93	93	93	93	93	93	94	93	93
Cloudier (%)	11	11	11	11	11	11	11	10	10	10	10	10	9	9	8	8	8	8	8	7	7	7	7	7	7	7	7	6	7	7

	Clearer (%)	Cloudier (%)
1	89	11
2	89	11
3	89	11
4	89	11
5	89	11
6	89	11
7	89	11
8	90	10
9	90	10
10	90	10
11	90	10
12	90	10
13	91	9
14	91	9
15	92	8
16	92	8
17	92	8
18	92	8
19	92	8
20	93	7
21	93	7
22	93	7
23	93	7
24	93	7
25	93	7
26	93	7
27	93	7
28	94	6
29	93	7
30	93	7

Chance of precipitation in September

Any precipitation

Rio Tinto gets around 47 mm of rain over 16.7 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 55% and peaks near 63% on the wettest days. The odds ease toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	63	63	63	63	63	63	63	63	62	62	62	61	60	59	58	57	56	55	54	52	51	50	48	47	46	45	44	44	43	43

	Rain chance (%)
1	63
2	63
3	63
4	63
5	63
6	63
7	63
8	63
9	62
10	62
11	62
12	61
13	60
14	59
15	58
16	57
17	56
18	55
19	54
20	52
21	51
22	50
23	48
24	47
25	46
26	45
27	44
28	44
29	43
30	43

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 56% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Humid (%)	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0
Muggy (%)	60	60	60	60	59	59	59	58	58	57	57	57	56	56	56	55	55	55	55	55	54	54	54	55	54	54	53	52	52	51
Oppressive (%)	39	39	39	39	40	40	40	41	41	42	42	42	43	43	43	44	44	44	44	44	45	45	45	45	46	46	47	48	48	49

	Humid (%)	Muggy (%)	Oppressive (%)
1	1	60	39
2	1	60	39
3	1	60	39
4	1	60	39
5	1	59	40
6	1	59	40
7	1	59	40
8	1	58	41
9	1	58	41
10	1	57	42
11	1	57	42
12	1	57	42
13	1	56	43
14	1	56	43
15	1	56	43
16	1	55	44
17	1	55	44
18	1	55	44
19	1	55	44
20	1	55	44
21	1	54	45
22	1	54	45
23	1	54	45
24	0	55	45
25	0	54	46
26	0	54	46
27	0	53	47
28	0	52	48
29	0	52	48
30	0	51	49

Wind in September

Winds average 22 km/h in September.

Across September, daily wind ranges from about 22 km/h on the calmest days to 23 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	23	23	23	23	23	23	23	23	23	23	23	23	23	23	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22
Feels	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy

	Wind speed (km/h)	Feels
1	23	breezy
2	23	breezy
3	23	breezy
4	23	breezy
5	23	breezy
6	23	breezy
7	23	breezy
8	23	breezy
9	23	breezy
10	23	breezy
11	23	breezy
12	23	breezy
13	23	breezy
14	23	breezy
15	22	breezy
16	22	breezy
17	22	breezy
18	22	breezy
19	22	breezy
20	22	breezy
21	22	breezy
22	22	breezy
23	22	breezy
24	22	breezy
25	22	breezy
26	22	breezy
27	22	breezy
28	22	breezy
29	22	breezy
30	22	breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over September. Sunrise moves from 5:24 AM to 5:08 AM, and sunset from 5:16 PM to 5:11 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.1
Sunrise (AM)	5:24	5:23	5:23	5:22	5:22	5:21	5:21	5:20	5:20	5:19	5:19	5:18	5:17	5:17	5:16	5:16	5:15	5:15	5:14	5:13	5:13	5:12	5:12	5:11	5:11	5:10	5:10	5:09	5:09	5:08
Sunset (PM)	5:16	5:16	5:16	5:16	5:15	5:15	5:15	5:15	5:15	5:15	5:14	5:14	5:14	5:14	5:14	5:14	5:13	5:13	5:13	5:13	5:13	5:12	5:12	5:12	5:12	5:12	5:12	5:12	5:11	5:11

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.9	5:24	5:16
2	11.9	5:23	5:16
3	11.9	5:23	5:16
4	11.9	5:22	5:16
5	11.9	5:22	5:15
6	11.9	5:21	5:15
7	11.9	5:21	5:15
8	11.9	5:20	5:15
9	11.9	5:20	5:15
10	11.9	5:19	5:15
11	11.9	5:19	5:14
12	11.9	5:18	5:14
13	11.9	5:17	5:14
14	12.0	5:17	5:14
15	12.0	5:16	5:14
16	12.0	5:16	5:14
17	12.0	5:15	5:13
18	12.0	5:15	5:13
19	12.0	5:14	5:13
20	12.0	5:13	5:13
21	12.0	5:13	5:13
22	12.0	5:12	5:12
23	12.0	5:12	5:12
24	12.0	5:11	5:12
25	12.0	5:11	5:12
26	12.0	5:10	5:12
27	12.0	5:10	5:12
28	12.0	5:09	5:12
29	12.0	5:09	5:11
30	12.1	5:08	5:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.71 kWh/m².

For context, solar energy here swings from a low near 4.23 kWh/m² to a high of 6.15 kWh/m² in November across the year — September's 5.71 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	5.4	5.4	5.4	5.5	5.5	5.5	5.5	5.5	5.5	5.6	5.6	5.6	5.6	5.7	5.7	5.7	5.7	5.8	5.8	5.8	5.8	5.8	5.9	5.9	5.9	5.9	5.9	6.0	6.0	6.0
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.4	Bright
2	5.4	Bright
3	5.4	Bright
4	5.5	Bright
5	5.5	Bright
6	5.5	Bright
7	5.5	Bright
8	5.5	Bright
9	5.5	Bright
10	5.6	Bright
11	5.6	Bright
12	5.6	Bright
13	5.6	Bright
14	5.7	Bright
15	5.7	Bright
16	5.7	Bright
17	5.7	Bright
18	5.8	Bright
19	5.8	Bright
20	5.8	Bright
21	5.8	Bright
22	5.8	Bright
23	5.9	Bright
24	5.9	Bright
25	5.9	Bright
26	5.9	Bright
27	5.9	Bright
28	6.0	Bright
29	6.0	Bright
30	6.0	Bright

Planning a trip in September

Hazard calendar for Rio Tinto

In seasonPeak

None of Rio Tinto's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Rio Tinto's rainy season runs February–July, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Rio Tinto?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.9

Sightseeing

3rd-best month of the year

5.9

Beach & pool

4th-best month of the year

September is a reasonable time to visit Rio Tinto for sightseeing.

What to pack for Rio Tinto in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Rio Tinto sees daytime highs around 27°C and nights near 23°C. Pack rain gear. Worth having: light clothes, sun protection and a windbreaker. About 17 days see rain.

rain gearlight clothessun protectiona windbreaker

Sea temperature near Rio Tinto in September

The nearest coast averages about 26°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 24 km away) is warmest in March at about 29°C and coldest in August near 26°C.

The water stays above 20°C all year — warm enough for a swim any month.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	28	29	29	29	28	27	27	26	26	27	27	28
Comfort	Tropical	Tropical	Tropical	Tropical	Tropical	Warm	Warm	Warm	Warm	Warm	Warm	Warm

	Sea temperature (°C)	Comfort
Jan	28	Tropical
Feb	29	Tropical
Mar	29	Tropical
Apr	29	Tropical
May	28	Tropical
Jun	27	Warm
Jul	27	Warm
Aug	26	Warm
Sep	26	Warm
Oct	27	Warm
Nov	27	Warm
Dec	28	Warm

UV index in Rio Tinto in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rio Tinto peaks around March 10 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 15 at about 10 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	13	15	15	13	11	10	10	10	12	12	12	12
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	13	Extreme
Feb	15	Extreme
Mar	15	Extreme
Apr	13	Extreme
May	11	Extreme
Jun	10	Very high
Jul	10	Very high
Aug	10	Very high
Sep	12	Extreme
Oct	12	Extreme
Nov	12	Extreme
Dec	12	Extreme

Location & terrain

Where is Rio Tinto?

Rio Tinto sits at 6.8°S, 35.1°W, 35 m above sea level, in Brazil. The nearest listed city is Mamanguape, 6.0 km away.

Topography around Rio Tinto

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rio Tinto.

Within 3 km, the terrain around Rio Tinto has only modest variations in elevation — a maximum elevation change of 140 m around an average of 43 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 219 m; within 80 km, large variations in elevation — a maximum elevation change of 646 m.

The land around Rio Tinto is covered by grassland (40%) and trees (38%) within 3 km, grassland (38%), trees (27%) and cropland (22%) within 16 km, and grassland (47%) and water (28%) within 80 km.

3 km

140 m

grassland 40%

16 km

219 m

grassland 38%

80 km

646 m

grassland 47%

treesshrubsgrasslandcroplandartificial surfaceswaterwetlandmangroves

← August Rio Tinto year-round climate October →Best places to visit in September

September weather nearby: Mamanguape 6.0 km · Itapororoca 19 km · Araçagi 34 km · Cabedelo 34 km · Santa Rita 36 km · Sapé 37 km · Cruz do Espírito Santo 37 km · Mari 39 km

Brazil travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / N; 127 / 220 V · 60 Hz
Prices: ≈ 46% of US; price level, 2025
GDP per capita: $10,713; 2025
Happiness: 6.6 / 10; World Happiness, 2025
Safe drinking water: 89%; of population, 2024
Homicide rate: 19.3; per 100k, 2023
Road deaths: 16; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Low; EF EPI 482
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Rio Tinto (-6.8031°, -35.0806°, elevation 35 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	27	23
2	27	23
3	27	23
4	27	23
5	27	23
6	27	23
7	27	23
8	27	23
9	27	23
10	27	23
11	27	23
12	27	23
13	27	23
14	27	23
15	27	23
16	27	23
17	27	23
18	27	23
19	27	23
20	27	23
21	27	23
22	27	23
23	27	24
24	27	24
25	27	24
26	27	24
27	27	24
28	27	24
29	27	24
30	27	24

	Clearer (%)	Cloudier (%)
1	89	11
2	89	11
3	89	11
4	89	11
5	89	11
6	89	11
7	89	11
8	90	10
9	90	10
10	90	10
11	90	10
12	90	10
13	91	9
14	91	9
15	92	8
16	92	8
17	92	8
18	92	8
19	92	8
20	93	7
21	93	7
22	93	7
23	93	7
24	93	7
25	93	7
26	93	7
27	93	7
28	94	6
29	93	7
30	93	7

	Rain chance (%)
1	63
2	63
3	63
4	63
5	63
6	63
7	63
8	63
9	62
10	62
11	62
12	61
13	60
14	59
15	58
16	57
17	56
18	55
19	54
20	52
21	51
22	50
23	48
24	47
25	46
26	45
27	44
28	44
29	43
30	43

	Humid (%)	Muggy (%)	Oppressive (%)
1	1	60	39
2	1	60	39
3	1	60	39
4	1	60	39
5	1	59	40
6	1	59	40
7	1	59	40
8	1	58	41
9	1	58	41
10	1	57	42
11	1	57	42
12	1	57	42
13	1	56	43
14	1	56	43
15	1	56	43
16	1	55	44
17	1	55	44
18	1	55	44
19	1	55	44
20	1	55	44
21	1	54	45
22	1	54	45
23	1	54	45
24	0	55	45
25	0	54	46
26	0	54	46
27	0	53	47
28	0	52	48
29	0	52	48
30	0	51	49

	Avg high (°C)	Avg low (°C)
1	27	23
2	27	23
3	27	23
4	27	23
5	27	23
6	27	23
7	27	23
8	27	23
9	27	23
10	27	23
11	27	23
12	27	23
13	27	23
14	27	23
15	27	23
16	27	23
17	27	23
18	27	23
19	27	23
20	27	23
21	27	23
22	27	23
23	27	24
24	27	24
25	27	24
26	27	24
27	27	24
28	27	24
29	27	24
30	27	24

	Clearer (%)	Cloudier (%)
1	89	11
2	89	11
3	89	11
4	89	11
5	89	11
6	89	11
7	89	11
8	90	10
9	90	10
10	90	10
11	90	10
12	90	10
13	91	9
14	91	9
15	92	8
16	92	8
17	92	8
18	92	8
19	92	8
20	93	7
21	93	7
22	93	7
23	93	7
24	93	7
25	93	7
26	93	7
27	93	7
28	94	6
29	93	7
30	93	7

	Rain chance (%)
1	63
2	63
3	63
4	63
5	63
6	63
7	63
8	63
9	62
10	62
11	62
12	61
13	60
14	59
15	58
16	57
17	56
18	55
19	54
20	52
21	51
22	50
23	48
24	47
25	46
26	45
27	44
28	44
29	43
30	43

	Humid (%)	Muggy (%)	Oppressive (%)
1	1	60	39
2	1	60	39
3	1	60	39
4	1	60	39
5	1	59	40
6	1	59	40
7	1	59	40
8	1	58	41
9	1	58	41
10	1	57	42
11	1	57	42
12	1	57	42
13	1	56	43
14	1	56	43
15	1	56	43
16	1	55	44
17	1	55	44
18	1	55	44
19	1	55	44
20	1	55	44
21	1	54	45
22	1	54	45
23	1	54	45
24	0	55	45
25	0	54	46
26	0	54	46
27	0	53	47
28	0	52	48
29	0	52	48
30	0	51	49

	Avg high (°C)	Avg low (°C)
1	27	23
2	27	23
3	27	23
4	27	23
5	27	23
6	27	23
7	27	23
8	27	23
9	27	23
10	27	23
11	27	23
12	27	23
13	27	23
14	27	23
15	27	23
16	27	23
17	27	23
18	27	23
19	27	23
20	27	23
21	27	23
22	27	23
23	27	24
24	27	24
25	27	24
26	27	24
27	27	24
28	27	24
29	27	24
30	27	24

	Clearer (%)	Cloudier (%)
1	89	11
2	89	11
3	89	11
4	89	11
5	89	11
6	89	11
7	89	11
8	90	10
9	90	10
10	90	10
11	90	10
12	90	10
13	91	9
14	91	9
15	92	8
16	92	8
17	92	8
18	92	8
19	92	8
20	93	7
21	93	7
22	93	7
23	93	7
24	93	7
25	93	7
26	93	7
27	93	7
28	94	6
29	93	7
30	93	7

	Rain chance (%)
1	63
2	63
3	63
4	63
5	63
6	63
7	63
8	63
9	62
10	62
11	62
12	61
13	60
14	59
15	58
16	57
17	56
18	55
19	54
20	52
21	51
22	50
23	48
24	47
25	46
26	45
27	44
28	44
29	43
30	43

	Humid (%)	Muggy (%)	Oppressive (%)
1	1	60	39
2	1	60	39
3	1	60	39
4	1	60	39
5	1	59	40
6	1	59	40
7	1	59	40
8	1	58	41
9	1	58	41
10	1	57	42
11	1	57	42
12	1	57	42
13	1	56	43
14	1	56	43
15	1	56	43
16	1	55	44
17	1	55	44
18	1	55	44
19	1	55	44
20	1	55	44
21	1	54	45
22	1	54	45
23	1	54	45
24	0	55	45
25	0	54	46
26	0	54	46
27	0	53	47
28	0	52	48
29	0	52	48
30	0	51	49