Alumínio weather in September

In September, Alumínio sees average daytime highs of 26°C and overnight lows near 15°C, with 82 mm of rain across 9 wet days and about 11.9 hours of daylight. It is the 8th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 38% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 11 h 30 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Alumínio's 6th-clearest and 1st-windiest month. For the whole year in context, see Alumínio's year-round climate.

Daytime high
26°
8th warmest
Overnight low
15°
5th coldest
Rainfall
82 mm
9 wet days
Daylight
11 h 54 min
7:07 AM – 6:59 PM
Cloud cover
54%
6th clearest
Wind
12 km/h
1st windiest
Solar energy
5.02 kWh/m²
Travel score
7.0
out of 10

Alumínio is human settlement in Brazil.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 26°C through the month.

A typical September day in Alumínio reaches about 26°C in the afternoon and slips back to 15°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 32°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12614
22614
32614
42614
52614
62614
72615
82615
92615
102615
112615
122615
132615
142615
152615
162615
172615
182615
192615
202615
212515
222515
232515
242515
252515
262515
272515
282515
292616
302616

Alumínio weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°22922.313.34.4
Feb28° / 19°16118.812.84.4
Mar28° / 19°12617.712.25.3
Apr26° / 17°608.511.56.9
May24° / 14°596.910.97.4
Jun23° / 13°485.310.67.7
Jul23° / 12°454.910.77.9
Aug24° / 13°374.711.28.1
Sep26° / 15°82911.97.0
Oct26° / 17°10913.112.66.0
Nov27° / 17°14115.613.15.5
Dec28° / 19°17920.113.44.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% 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 48%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16535
26436
36337
46337
56238
66040
75941
85842
95743
105644
115545
125446
135446
145248
155248
165149
175149
185050
194852
204753
214654
224654
234555
244357
254258
264258
274159
284060
293961
303961

Chance of precipitation in September

Any precipitation

Alumínio gets around 82 mm of rain over 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 29% and peaks near 39% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
119
220
320
421
522
622
723
824
924
1025
1125
1226
1326
1427
1528
1629
1730
1831
1932
2033
2134
2235
2336
2437
2537
2638
2738
2839
2939
3039

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 39% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15634100
25634100
35435110
45335120
55335120
65235130
75036140
84837150
94737161
104538161
114339171
124239181
134040191
143941201
153841211
163641211
173542221
183442231
193342241
203242242
213142252
223042263
232942263
242841274
252741284
262640295
272540305
282439316
292339326
302338336

Wind in September

Winds average 12 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912calm
3012calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 30 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 42 minutes over September. Sunrise moves from 7:23 AM to 6:53 AM, and sunset from 6:54 PM to 7:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:236:54
211.57:226:55
311.67:216:55
411.67:206:55
511.67:196:56
611.67:186:56
711.77:176:56
811.77:166:57
911.77:156:57
1011.77:146:57
1111.77:136:58
1211.87:126:58
1311.87:116:58
1411.87:106:59
1511.87:086:59
1611.97:076:59
1711.97:067:00
1811.97:057:00
1911.97:047:00
2012.07:037:01
2112.07:027:01
2212.07:017:01
2312.07:007:02
2412.16:597:02
2512.16:587:02
2612.16:577:03
2712.16:567:03
2812.16:557:03
2912.26:547:04
3012.26:537:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.02 kWh/m².

For context, solar energy here swings from a low near 3.43 kWh/m² to a high of 5.85 kWh/m² in December across the year — September's 5.02 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.1Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
Planning a trip in September

Hazard calendar for Alumínio

In seasonPeak

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

Alumínio'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 Alumínio?

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

7.0
Sightseeing
5th-best month of the year
6.5
Beach & pool
3rd-best month of the year

September is one of the better times to visit Alumínio for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Alumínio in September

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

In September, Alumínio sees daytime highs around 26°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Alumínio in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Alumínio peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 21UV 15Jul 12UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug8Very high
Sep8Very high
Oct11Extreme
Nov12Extreme
Dec14Extreme

Air quality in Alumínio 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 Alumínio is worst in July — around 38 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (January, 18 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateJul 1838 µg/m³Jan 1018 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb20Moderate
Mar22Moderate
Apr26Moderate
May31Moderate
Jun35Poor
Jul38Poor
Aug36Poor
Sep35Poor
Oct25Moderate
Nov18Moderate
Dec18Moderate
Location & terrain

Where is Alumínio?

Alumínio sits at 23.5°S, 47.3°W, 789 m above sea level, in Brazil. The nearest listed city is Mairinque, 8.0 km away.

Topography around Alumínio

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

Within 3 km, the terrain around Alumínio has significant variations in elevation — a maximum elevation change of 295 m around an average of 826 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 530 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,291 m.

The land around Alumínio is covered by trees (68%) within 3 km, trees (61%) and grassland (27%) within 16 km, and trees (56%) within 80 km.

3 km
295 m
16 km
530 m
80 km
1,291 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Mairinque 8.0 km · São Roque 13 km · Ibiúna 14 km · Votorantim 18 km · Sorocaba 20 km · Araçariguama 23 km · Vargem Grande Paulista 25 km · Piedade 26 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 Alumínio (-23.535°, -47.2619°, elevation 789 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).