Rio Brilhante weather in September

In September, Rio Brilhante sees average daytime highs of 31°C and overnight lows near 19°C, with 82 mm of rain across 7.7 wet days and about 11.9 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 51% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Rio Brilhante's 4th-clearest and 2nd-windiest month. For the whole year in context, see Rio Brilhante's year-round climate.

Daytime high
31°
7th warmest
Overnight low
19°
5th coldest
Rainfall
82 mm
7.7 wet days
Daylight
11 h 54 min
6:36 AM – 6:29 PM
Cloud cover
44%
4th clearest
Wind
10 km/h
2nd windiest
Solar energy
5.35 kWh/m²
Travel score
4.9
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical September day in Rio Brilhante reaches about 31°C in the afternoon and slips back to 19°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 37°C. Set against its neighbours, September runs about 2°C warmer than August and on par with October.

10°20°30°40°151015202530
Avg high (°C)Avg low (°C)
13118
23118
33118
43118
53118
63118
73119
83119
93119
103119
113119
123119
133119
143119
153119
163119
173119
183119
193119
203119
213119
223119
233119
243119
253119
263119
273120
283120
293120
303120

How September really feels in Rio Brilhante

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Rio Brilhante weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 23°18219.713.23.2
Feb32° / 22°14217.212.73.3
Mar32° / 22°11414.912.23.7
Apr30° / 20°688.611.55.1
May27° / 17°767.7116.9
Jun26° / 16°515.710.77.5
Jul27° / 15°374.710.87.7
Aug29° / 17°424.711.36.3
Sep31° / 19°827.711.94.9
Oct32° / 21°1201312.53.9
Nov32° / 21°13713.8133.7
Dec32° / 22°15417.613.33.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 51% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 36%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17525
27525
37426
47327
57228
67129
77030
86931
96733
106733
116733
126535
136535
146436
156436
166436
176337
186337
196238
206238
216238
226139
236040
245941
255842
265743
275644
285644
295545
305446

Chance of precipitation in September

Any precipitation

Rio Brilhante gets around 82 mm of rain over 7.7 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 26% and peaks near 38% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
116
217
317
418
518
619
719
820
920
1021
1121
1222
1323
1423
1524
1625
1725
1826
1927
2028
2129
2230
2331
2432
2534
2635
2736
2836
2937
3038

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 31% of days. Sticky, muggy-or-worse air turns up on roughly 20% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
147311570
246311670
345311680
444311780
543311790
642311890
7413019100
8393020100
9383020111
10372921121
11362923121
12342924131
13332825131
14322825141
15312726151
16302727161
17292627171
18282528181
19272528191
20262428211
21252328231
22242327252
23232227272
24212127282
25202126303
26192026323
27181925343
28171925354
29161825374
30161725385

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 36 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over September. Sunrise moves from 6:51 AM to 6:22 AM, and sunset from 6:25 PM to 6:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:516:25
211.66:506:25
311.66:496:25
411.66:486:26
511.66:476:26
611.76:466:26
711.76:456:26
811.76:446:27
911.76:436:27
1011.76:426:27
1111.86:416:27
1211.86:406:28
1311.86:396:28
1411.86:386:28
1511.96:376:29
1611.96:366:29
1711.96:356:29
1811.96:346:29
1911.96:336:30
2012.06:326:30
2112.06:316:30
2212.06:306:30
2312.06:296:31
2412.06:286:31
2512.16:276:31
2612.16:266:32
2712.16:256:32
2812.16:246:32
2912.26:236:33
3012.26:226:33

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.35 kWh/m².

For context, solar energy here swings from a low near 3.49 kWh/m² to a high of 6.18 kWh/m² in December across the year — September's 5.35 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.4Bright
165.4Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in September

Hazard calendar for Rio Brilhante

In seasonPeak

None of Rio Brilhante'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 Brilhante's rainy season runs October–March, 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 Brilhante?

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

4.9
Sightseeing
6th-best month of the year
7.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Rio Brilhante for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Rio Brilhante in September

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

In September, Rio Brilhante sees daytime highs around 31°C and nights near 19°C. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

UV index in Rio Brilhante in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rio Brilhante peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 14 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highModerateExtremeJan 19UV 15Sep 14UV 3
UV index (midday)Level
Jan16Extreme
Feb14Extreme
Mar13Extreme
Apr10Very high
May7Very high
Jun6High
Jul6High
Aug8Very high
Sep3Moderate
Oct12Extreme
Nov12Extreme
Dec13Extreme

Air quality in Rio Brilhante 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 Rio Brilhante is worst in September — around 25 µg/m³ PM2.5 (moderate), about 4.6× the cleanest month (April, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1623 µg/m³Apr 105 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb7Good
Mar6Good
Apr5Good
May6Good
Jun6Good
Jul6Good
Aug14Moderate
Sep25Moderate
Oct14Moderate
Nov8Good
Dec7Good
Location & terrain

Where is Rio Brilhante?

Rio Brilhante sits at 21.8°S, 54.5°W, 319 m above sea level, in Brazil. The nearest listed city is Itaporã, 40 km away.

Topography around Rio Brilhante

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

Within 3 km, the terrain around Rio Brilhante has only modest variations in elevation — a maximum elevation change of 39 m around an average of 312 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 126 m; within 80 km, significant variations in elevation — a maximum elevation change of 312 m.

The land around Rio Brilhante is covered by cropland (38%), trees (25%) and artificial surfaces (20%) within 3 km, cropland (60%) and trees (21%) within 16 km, and cropland (64%) within 80 km.

3 km
39 m
16 km
126 m
80 km
312 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Itaporã 40 km · Nova Alvorada do Sul 41 km · Dourados 54 km · Fátima do Sul 64 km · Maracaju 68 km · Caarapó 97 km · Sidrolândia 106 km · Nova Andradina 133 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 Rio Brilhante (-21.8019°, -54.5464°, elevation 319 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).