São Domingos do Araguaia weather in September

In September, São Domingos do Araguaia sees average daytime highs of 34°C and overnight lows near 24°C, with 18 mm of rain across 3.4 wet days and about 12 hours of daylight. It is the 2nd-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 61% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is São Domingos do Araguaia's 3rd-clearest and 3rd-windiest month. For the whole year in context, see São Domingos do Araguaia's year-round climate.

Daytime high
34°
2nd warmest
Overnight low
24°
10th coldest
Rainfall
18 mm
3.4 wet days
Daylight
12 hours
6:10 AM – 6:08 PM
Cloud cover
39%
3rd clearest
Wind
8 km/h
3rd windiest
Solar energy
6.28 kWh/m²
Travel score
3.7
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 34°C through the month.

A typical September day in São Domingos do Araguaia reaches about 34°C in the afternoon and slips back to 24°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 36°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13423
23423
33423
43423
53423
63423
73424
83424
93424
103424
113424
123424
133424
143424
153424
163424
173424
183424
193424
203424
213424
223424
233424
243424
253424
263424
273424
283424
293424
303324

How September really feels in São Domingos do Araguaia

Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

São Domingos do Araguaia weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°27727.912.32.8
Feb30° / 23°27325.712.22.7
Mar30° / 23°28628.4122.7
Apr31° / 23°22225.111.92.9
May31° / 23°12116.311.83.7
Jun32° / 23°224.411.74.4
Jul33° / 22°112.111.74.2
Aug34° / 23°5111.83.8
Sep34° / 24°183.4123.7
Oct33° / 24°6910.212.13.6
Nov32° / 24°13617.512.33.3
Dec31° / 23°21124.112.33.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 61% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 21%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18515
28317
38317
48317
58317
68218
78218
88218
98218
108218
118119
128119
138119
148119
158119
168020
178020
187921
197921
207822
217723
227723
237723
247525
257525
267426
277327
287327
297228
307129

Chance of precipitation in September

Any precipitation

São Domingos do Araguaia gets around 18 mm of rain over 3.4 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 11% and peaks near 18% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
16
27
37
48
58
68
79
89
99
109
119
1210
1310
1410
1510
1610
1710
1810
1911
2011
2112
2213
2314
2414
2515
2616
2716
2817
2918
3018

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 63% of days. Sticky, muggy-or-worse air turns up on roughly 95% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1848430
2848440
3847450
4846470
5845470
6844480
7842500
8841510
9840520
10839530
11738550
12736570
13735580
14634600
15633601
16531631
17530641
18528661
19427681
20425701
21324712
22323722
23221752
24220762
25118792
26117793
27116803
28115813
29014833
30013843

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

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

Days grow by about 6 minutes over September. Sunrise moves from 6:18 AM to 6:03 AM, and sunset from 6:11 PM to 6:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:186:11
211.96:176:11
311.96:176:11
411.96:166:11
511.96:166:11
611.96:156:10
711.96:156:10
811.96:146:10
911.96:146:10
1011.96:136:10
1111.96:136:09
1211.96:126:09
1312.06:126:09
1412.06:116:09
1512.06:116:09
1612.06:106:08
1712.06:106:08
1812.06:096:08
1912.06:096:08
2012.06:086:07
2112.06:086:07
2212.06:076:07
2312.06:066:07
2412.06:066:07
2512.06:056:06
2612.06:056:06
2712.06:046:06
2812.06:046:06
2912.06:036:06
3012.06:036:06

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.28 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.42 kWh/m² to a high of 6.28 kWh/m² in September across the year — September's 6.28 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.2Intense
56.2Intense
66.2Intense
76.3Intense
86.3Intense
96.3Intense
106.3Intense
116.3Intense
126.3Intense
136.3Intense
146.3Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.3Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.3Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.3Intense
Planning a trip in September

Hazard calendar for São Domingos do Araguaia

In seasonPeak

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

São Domingos do Araguaia's monsoon runs November–April, when most of the year's rain falls.

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

Is September a good time to visit São Domingos do Araguaia?

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

3.7
Sightseeing
4th-best month of the year
7.2
Beach & pool
4th-best month of the year

September is a weaker month for outdoor sightseeing in São Domingos do Araguaia. The water and warmth also suit a beach or pool day.

What to pack for São Domingos do Araguaia in September

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

In September, São Domingos do Araguaia sees daytime highs around 34°C and nights near 24°C. Pack light clothes and sun protection. About 3 days see rain.

light clothessun protection

UV index in São Domingos do Araguaia 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 São Domingos do Araguaia peaks around March 11 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 11UV 15Jul 13UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct11Extreme
Nov11Extreme
Dec10Very high

Air quality in São Domingos do Araguaia in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in São Domingos do Araguaia is worst in October — around 34 µg/m³ PM2.5 (moderate), about 4.5× the cleanest month (July, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateOct 1534 µg/m³Jul 108 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar12Moderate
Apr12Good
May10Good
Jun8Good
Jul8Good
Aug18Moderate
Sep31Moderate
Oct34Moderate
Nov29Moderate
Dec20Moderate
Location & terrain

Where is São Domingos do Araguaia?

São Domingos do Araguaia sits at 5.5°S, 48.7°W, 132 m above sea level, in Brazil. The nearest listed city is Marabá, 47 km away.

Topography around São Domingos do Araguaia

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Domingos do Araguaia.

Within 3 km, the terrain around São Domingos do Araguaia has only modest variations in elevation — a maximum elevation change of 54 m around an average of 137 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 116 m; within 80 km, significant variations in elevation — a maximum elevation change of 511 m.

The land around São Domingos do Araguaia is covered by grassland (69%) and trees (23%) within 3 km, grassland (73%) and trees (26%) within 16 km, and grassland (61%) and trees (36%) within 80 km.

3 km
54 m
16 km
116 m
80 km
511 m
treesgrasslandartificial surfaceswater
September weather nearby: Marabá 47 km · Bom Jesus do Tocantins 56 km · Araguatins 70 km · Itupiranga 80 km · Eldorado dos Carajás 93 km · São Geraldo do Araguaia 98 km · Rondon do Pará 112 km · Curionópolis 114 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
Roman Catholic 57%Evangelical 27%none 9%other 4%

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 São Domingos do Araguaia (-5.5378°, -48.7333°, elevation 132 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).