Guaraí weather in September

In September, Guaraí sees average daytime highs of 35°C and overnight lows near 23°C, with 25 mm of rain across 3.7 wet days and about 11.9 hours of daylight. It is the 1st-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 35°C through the month. The sky is clear or mostly clear about 57% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Guaraí's 4th-clearest and 4th-windiest month. For the whole year in context, see Guaraí's year-round climate.

Daytime high
35°
1st warmest
Overnight low
23°
12th coldest
Rainfall
25 mm
3.7 wet days
Daylight
12 hours
6:10 AM – 6:07 PM
Cloud cover
42%
4th clearest
Wind
8 km/h
4th windiest
Solar energy
6.15 kWh/m²
Travel score
2.8
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 35°C through the month.

A typical September day in Guaraí reaches about 35°C in the afternoon and slips back to 23°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 38°C. Set against its neighbours, September runs on par with August and about 2°C warmer than October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13623
23623
33623
43623
53623
63623
73623
83623
93623
103623
113623
123623
133623
143623
153523
163523
173523
183523
193523
203523
213523
223523
233523
243523
253523
263523
273423
283423
293423
303423

How September really feels in Guaraí

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.

Guaraí weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 22°27727.512.52.9
Feb30° / 22°2572512.32.9
Mar30° / 22°25726.812.12.9
Apr31° / 22°1622011.83.4
May32° / 22°598.911.64.2
Jun33° / 22°20.511.54.5
Jul34° / 21°10.211.54.2
Aug35° / 22°20.411.73.2
Sep35° / 23°253.711.92.8
Oct33° / 23°10713.912.23.2
Nov31° / 23°21021.312.43.1
Dec30° / 22°23424.212.53.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 57% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 28%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18020
27921
37921
47921
57921
67921
77822
87822
97723
107723
117723
127723
137624
147624
157525
167327
177228
187129
197030
206931
216832
226733
236634
246535
256436
266337
276337
286238
296238
306139

Chance of precipitation in September

Any precipitation

Guaraí gets around 25 mm of rain over 3.7 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 13% and peaks near 28% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
13
24
34
44
55
65
75
85
96
106
117
128
138
149
1510
1611
1712
1813
1915
2016
2117
2219
2320
2421
2523
2624
2725
2826
2927
3028

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 32% of days. Sticky, muggy-or-worse air turns up on roughly 47% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1203325202
2203225202
3203125213
4203025223
5203024234
6193024234
7192923245
8192923245
9182923256
10172822266
11172722277
12162722288
13152622289
141425222910
151424213011
161322213112
171221213313
181119203415
191018203517
20916193718
21915193820
22813183922
23712174024
24611164126
25510154228
2649154230
2738144332
2837134335
2926134236
3026124238

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 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 48 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 18 minutes over September. Sunrise moves from 6:19 AM to 6:01 AM, and sunset from 6:09 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:196:09
211.86:186:09
311.86:186:08
411.96:176:08
511.96:176:08
611.96:166:08
711.96:156:08
811.96:156:08
911.96:146:08
1011.96:146:08
1111.96:136:08
1211.96:126:07
1311.96:126:07
1411.96:116:07
1511.96:106:07
1612.06:106:07
1712.06:096:07
1812.06:096:07
1912.06:086:07
2012.06:076:06
2112.06:076:06
2212.06:066:06
2312.06:056:06
2412.06:056:06
2512.06:046:06
2612.06:046:06
2712.06:036:06
2812.16:026:06
2912.16:026:06
3012.16:016:05

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.15 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.9 kWh/m² to a high of 6.15 kWh/m² in September across the year — September's 6.15 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.1Intense
56.2Intense
66.2Intense
76.2Intense
86.2Intense
96.2Intense
106.2Intense
116.2Intense
126.2Intense
136.2Intense
146.2Intense
156.2Intense
166.2Intense
176.2Intense
186.2Intense
196.2Intense
206.2Intense
216.2Intense
226.1Intense
236.1Intense
246.1Intense
256.1Intense
266.1Intense
276.1Intense
286.1Intense
296.1Intense
306.1Intense
Planning a trip in September

Hazard calendar for Guaraí

In seasonPeak

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

Guaraí'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 Guaraí?

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

2.8
Sightseeing
12th-best month of the year
6.2
Beach & pool
5th-best month of the year

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

What to pack for Guaraí in September

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

In September, Guaraí sees daytime highs around 35°C and nights near 23°C. Pack light clothes and sun protection. About 4 days see rain.

light clothessun protection

UV index in Guaraí 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 Guaraí peaks around February 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 18UV 15Jun 22UV 9
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar14Extreme
Apr13Extreme
May10Extreme
Jun9Very high
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct10Extreme
Nov12Extreme
Dec11Extreme

Air quality in Guaraí 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 Guaraí is worst in October — around 40 µg/m³ PM2.5 (poor), about 5.3× the cleanest month (June, 8 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateOct 1238 µg/m³Jun 208 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb11Good
Mar12Good
Apr11Good
May9Good
Jun8Good
Jul8Good
Aug15Moderate
Sep34Moderate
Oct40Poor
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Guaraí?

Guaraí sits at 8.8°S, 48.5°W, 260 m above sea level, in Brazil. The nearest listed city is Miracema do Tocantins, 83 km away.

Topography around Guaraí

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

Within 3 km, the terrain around Guaraí has only modest variations in elevation — a maximum elevation change of 114 m around an average of 272 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 416 m; within 80 km, significant variations in elevation — a maximum elevation change of 552 m.

The land around Guaraí is covered by grassland (47%) and trees (26%) within 3 km, grassland (55%) and trees (37%) within 16 km, and grassland (54%) and trees (37%) within 80 km.

3 km
114 m
16 km
416 m
80 km
552 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Miracema do Tocantins 83 km · Colinas do Tocantins 86 km · Conceição do Araguaia 105 km · Santa Maria das Barreiras 132 km · Palmas 150 km · Paraíso do Tocantins 154 km · Araguaína 186 km · Redenção 190 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 Guaraí (-8.8342°, -48.5103°, elevation 260 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).