Mairiporã weather in September

In September, Mairiporã sees average daytime highs of 25°C and overnight lows near 14°C, with 83 mm of rain across 9.1 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 25°C through the month. The sky is clear or mostly clear about 37% 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 Mairiporã's 5th-clearest and 1st-windiest month. For the whole year in context, see Mairiporã's year-round climate.

Daytime high
25°
8th warmest
Overnight low
14°
5th coldest
Rainfall
83 mm
9.1 wet days
Daylight
11 h 54 min
7:05 AM – 6:57 PM
Cloud cover
57%
5th clearest
Wind
11 km/h
1st windiest
Solar energy
4.9 kWh/m²
Travel score
7.0
out of 10

Mairiporã 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 25°C through the month.

A typical September day in Mairiporã reaches about 25°C in the afternoon and slips back to 14°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 31°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12514
22514
32514
42514
52514
62514
72514
82514
92514
102514
112514
122514
132514
142515
152515
162515
172515
182515
192515
202515
212515
222515
232515
242515
252515
262515
272515
282515
292515
302515

Mairiporã 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
Jan27° / 19°23522.713.34.4
Feb28° / 19°17919.312.84.6
Mar27° / 18°14718.712.25.2
Apr26° / 17°639.811.56.7
May23° / 14°627.310.97.2
Jun22° / 13°445.110.67.7
Jul22° / 12°474.910.77.7
Aug24° / 13°364.511.28.0
Sep25° / 14°839.111.97.0
Oct26° / 16°1191412.55.9
Nov26° / 17°15516.113.15.5
Dec27° / 18°18720.513.44.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 51%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16436
26337
36238
46139
56040
65941
75743
85644
95545
105446
115248
125149
135050
145050
154951
164852
174753
184753
194555
204456
214357
224357
234159
244060
254060
263961
273961
283763
293763
303763

Chance of precipitation in September

Any precipitation

Mairiporã gets around 83 mm of rain over 9.1 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 42% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
120
220
321
421
522
622
723
823
924
1025
1125
1226
1327
1427
1528
1629
1730
1832
1933
2034
2135
2236
2337
2438
2539
2640
2741
2842
2942
3042

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 44% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14840110
24741120
34641130
44442140
54343150
64143150
74044160
83845170
93645180
103546190
113347200
123147210
133048220
142948230
152848240
162748250
172648260
182548261
192547271
202447281
212346292
222345302
232245312
242244323
252143333
262042344
272041354
281941365
291940375
301839385

Wind in September

Winds average 11 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 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
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 7:20 AM to 6:50 AM, and sunset from 6:52 PM to 7:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:206:52
211.57:196:52
311.67:186:52
411.67:176:53
511.67:166:53
611.67:156:53
711.77:146:54
811.77:136:54
911.77:126:54
1011.77:116:55
1111.87:106:55
1211.87:096:55
1311.87:086:56
1411.87:076:56
1511.87:066:56
1611.97:056:57
1711.97:046:57
1811.97:036:57
1911.97:016:58
2012.07:006:58
2112.06:596:58
2212.06:586:59
2312.06:576:59
2412.16:566:59
2512.16:557:00
2612.16:547:00
2712.16:537:00
2812.16:527:01
2912.26:517:01
3012.26:507:01

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.9 kWh/m².

For context, solar energy here swings from a low near 3.44 kWh/m² to a high of 5.61 kWh/m² in December across the year — September's 4.9 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
305.0Bright
Planning a trip in September

Hazard calendar for Mairiporã

In seasonPeak

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

Mairiporã'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 Mairiporã?

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
6.3
Beach & pool
2nd-best month of the year

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

What to pack for Mairiporã in September

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

In September, Mairiporã sees daytime highs around 25°C and nights near 14°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Mairiporã in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mairiporã peaks around January 20 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 20UV 15Jul 12UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug8Very high
Sep8Very high
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Mairiporã 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 Mairiporã is worst in June — around 71 µg/m³ PM2.5 (unhealthy), about 2.3× the cleanest month (December, 31 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorUnhealthyPoorModerateJun 2370 µg/m³Dec 2031 µg/m³
PM2.5 (µg/m³)Level
Jan32Moderate
Feb34Moderate
Mar41Poor
Apr48Poor
May62Unhealthy
Jun71Unhealthy
Jul70Unhealthy
Aug60Unhealthy
Sep53Poor
Oct39Poor
Nov32Moderate
Dec31Moderate
Location & terrain

Where is Mairiporã?

Mairiporã sits at 23.3°S, 46.6°W, 752 m above sea level, in Brazil. The nearest listed city is Franco da Rocha, 14 km away.

Topography around Mairiporã

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

Within 3 km, the terrain around Mairiporã has significant variations in elevation — a maximum elevation change of 426 m around an average of 864 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 612 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,045 m.

The land around Mairiporã is covered by trees (70%) within 3 km, trees (74%) within 16 km, and trees (55%) and grassland (24%) within 80 km.

3 km
426 m
16 km
612 m
80 km
2,045 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Franco da Rocha 14 km · Jaçanã 16 km · Caieiras 17 km · Mandaqui 17 km · Francisco Morato 17 km · Guarulhos 17 km · Cachoeirinha 17 km · Vila Galvão 17 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 Mairiporã (-23.3186°, -46.5867°, elevation 752 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).