Placas weather in September

In September, Placas sees average daytime highs of 34°C and overnight lows near 23°C, with 45 mm of rain across 8.9 wet days and about 12 hours of daylight. It is the 1st-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 39% 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 Placas's 3rd-clearest and 1st-windiest month. For the whole year in context, see Placas's year-round climate.

Daytime high
34°
1st warmest
Overnight low
23°
12th coldest
Rainfall
45 mm
8.9 wet days
Daylight
12 hours
6:32 AM – 6:31 PM
Cloud cover
53%
3rd clearest
Wind
7 km/h
1st windiest
Solar energy
5.95 kWh/m²
Travel score
3.0
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 Placas reaches about 34°C in the afternoon and slips back to 23°C overnight — a 11°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 on par with October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13423
23423
33423
43423
53423
63423
73423
83423
93423
103423
113423
123423
133423
143423
153423
163423
173423
183423
193423
203423
213423
223423
233423
243423
253423
263423
273423
283423
293423
303423

How September really feels in Placas

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.

Placas weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 22°23526.512.22.9
Feb30° / 22°24725.412.12.9
Mar30° / 22°29128.7122.8
Apr30° / 22°25027.511.92.7
May30° / 22°17124.911.83.1
Jun31° / 22°591411.84.1
Jul32° / 22°379.511.84.1
Aug34° / 22°296.611.93.5
Sep34° / 23°458.9123.0
Oct34° / 23°7813.812.12.9
Nov33° / 23°1151812.22.9
Dec31° / 23°15921.612.23.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 38%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16733
26733
36733
46634
56634
66634
76634
86634
96634
106634
116634
126634
136535
146436
156436
166436
176337
186337
196238
206139
215941
225941
235842
245743
255644
265644
275545
285545
295446
305347

Chance of precipitation in September

Any precipitation

Placas gets around 45 mm of rain over 8.9 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 30% and peaks near 35% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
124
225
325
426
526
627
727
828
928
1028
1129
1229
1329
1429
1529
1629
1730
1830
1930
2030
2131
2231
2332
2432
2533
2633
2734
2834
2935
3035

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 67% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
123761
223761
323761
423761
523761
623761
723761
823662
923662
1023563
1123464
1223464
1323365
1423266
1523167
1623167
1723068
1813069
1913069
2012970
2112970
2212970
2312871
2412871
2512772
2612772
2702674
2802674
2902575
3002476

Wind in September

Winds average 7 km/h in September, the windiest month of the year.

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

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
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 6:39 AM to 6:25 AM, and sunset from 6:34 PM to 6:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:396:34
211.96:386:34
311.96:386:34
411.96:376:34
511.96:376:33
611.96:376:33
711.96:366:33
812.06:366:33
912.06:356:32
1012.06:356:32
1112.06:346:32
1212.06:346:32
1312.06:336:31
1412.06:336:31
1512.06:326:31
1612.06:326:31
1712.06:316:30
1812.06:316:30
1912.06:306:30
2012.06:306:30
2112.06:296:29
2212.06:296:29
2312.06:286:29
2412.06:286:29
2512.06:286:28
2612.06:276:28
2712.06:276:28
2812.06:266:28
2912.06:266:27
3012.06:256:27

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.95 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.01 kWh/m² to a high of 5.95 kWh/m² in September across the year — September's 5.95 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.9Bright
105.9Bright
115.9Bright
125.9Bright
135.9Bright
146.0Bright
156.0Bright
166.0Bright
176.0Bright
186.0Intense
196.0Intense
206.0Intense
216.0Intense
226.0Intense
236.0Intense
246.0Intense
256.0Intense
266.0Intense
276.0Intense
286.0Intense
296.0Intense
306.0Intense
Planning a trip in September

Hazard calendar for Placas

In seasonPeak

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

Placas's rainy season runs December–May, 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 Placas?

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

3.0
Sightseeing
5th-best month of the year
6.1
Beach & pool
3rd-best month of the year

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

What to pack for Placas in September

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

In September, Placas sees daytime highs around 34°C and nights near 23°C. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Placas in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Placas peaks around February 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 17 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 highExtremeVery highExtremeFeb 21UV 15Nov 17UV 10
UV index (midday)Level
Jan13Extreme
Feb16Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Extreme
Sep11Extreme
Oct11Extreme
Nov9Very high
Dec11Extreme

Air quality in Placas 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 Placas is worst in October — around 59 µg/m³ PM2.5 (unhealthy), about 7.3× the cleanest month (June, 8 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModeratePoorUnhealthyModerateOct 2258 µg/m³Jun 208 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb13Moderate
Mar13Moderate
Apr12Good
May10Good
Jun8Good
Jul9Good
Aug15Moderate
Sep35Moderate
Oct59Unhealthy
Nov55Poor
Dec24Moderate
Location & terrain

Where is Placas?

Placas sits at 3.9°S, 54.2°W, 104 m above sea level, in Brazil. The nearest listed city is Uruará, 56 km away.

Topography around Placas

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

Within 3 km, the terrain around Placas has only modest variations in elevation — a maximum elevation change of 87 m around an average of 101 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 341 m; within 80 km, significant variations in elevation — a maximum elevation change of 444 m.

The land around Placas is covered by trees (48%) and grassland (48%) within 3 km, trees (71%) and grassland (29%) within 16 km, and trees (85%) within 80 km.

3 km
87 m
16 km
341 m
80 km
444 m
treesgrasslandartificial surfaces
September weather nearby: Uruará 56 km · Rurópolis 81 km · Aveiro 127 km · Mojuí dos Campos 140 km · Medicilândia 155 km · Belterra 158 km · Santarém 167 km · Brasil Novo 197 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 Placas (-3.8678°, -54.22°, elevation 104 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).