Ibiúna weather in September

In September, Ibiúna sees average daytime highs of 23°C and overnight lows near 14°C, with 99 mm of rain across 9.9 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 23°C through the month. The sky is clear or mostly clear about 32% 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 Ibiúna's 6th-clearest and 1st-windiest month. For the whole year in context, see Ibiúna's year-round climate.

Daytime high
23°
8th warmest
Overnight low
14°
5th coldest
Rainfall
99 mm
9.9 wet days
Daylight
11 h 54 min
7:07 AM – 6:59 PM
Cloud cover
62%
6th clearest
Wind
11 km/h
1st windiest
Solar energy
4.63 kWh/m²
Travel score
6.8
out of 10

Ibiúna 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 23°C through the month.

A typical September day in Ibiúna reaches about 23°C in the afternoon and slips back to 14°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 30°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12313
22313
32313
42314
52314
62314
72314
82414
92414
102414
112414
122414
132414
142414
152314
162314
172314
182314
192314
202314
212314
222314
232314
242314
252314
262314
272314
282314
292314
302315

Ibiúna 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
Jan26° / 19°2752513.34.2
Feb27° / 19°21421.812.84.3
Mar26° / 18°18021.712.24.9
Apr25° / 16°7811.911.56.5
May22° / 14°688.710.96.8
Jun21° / 13°58610.67.2
Jul21° / 12°595.810.77.3
Aug22° / 13°465.511.27.6
Sep23° / 14°999.911.96.8
Oct24° / 15°13015.612.65.8
Nov25° / 16°1691813.15.4
Dec26° / 18°20822.313.44.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 58%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25743
35644
45545
55347
65248
75149
84951
94852
104753
114654
124555
134456
144357
154159
164159
174060
184060
193961
203862
213763
223664
233565
243367
253268
263268
273169
283169
293070
303070

Chance of precipitation in September

Any precipitation

Ibiúna gets around 99 mm of rain over 9.9 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 32% and peaks near 45% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
123
223
324
424
525
625
726
827
927
1027
1128
1228
1329
1429
1530
1631
1732
1833
1934
2035
2137
2238
2339
2440
2541
2642
2743
2844
2944
3045

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 43% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1523990
25139100
35040110
44940120
54840120
64641130
74541140
84442140
94243150
104143160
113944170
123845170
133645180
143546190
153446190
163347200
173247210
183147220
193047221
203046231
212946251
222845261
232744271
242744281
252643302
262542312
272441322
282340342
292340353
302239363

Wind in September

Winds average 11 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
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
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 7:23 AM to 6:52 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
211.57:226:54
311.67:216:55
411.67:206:55
511.67:196:55
611.67:186:56
711.77:176:56
811.77:166:57
911.77:156:57
1011.77:146:57
1111.77:136:57
1211.87:126:58
1311.87:116:58
1411.87:096:58
1511.87:086:59
1611.97:076:59
1711.97:066:59
1811.97:057:00
1911.97:047:00
2012.07:037:00
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
2812.16:547:03
2912.26:537:04
3012.26:527:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.63 kWh/m².

For context, solar energy here swings from a low near 3.23 kWh/m² to a high of 5.63 kWh/m² in December across the year — September's 4.63 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.6Bright
84.6Bright
94.6Bright
104.6Bright
114.7Bright
124.7Bright
134.7Bright
144.7Bright
154.7Bright
164.7Bright
174.7Bright
184.7Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Ibiúna

In seasonPeak

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

Ibiúna'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 Ibiúna?

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

6.8
Sightseeing
4th-best month of the year
5.5
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Ibiúna for sightseeing.

What to pack for Ibiúna in September

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

In September, Ibiúna sees daytime highs around 23°C and nights near 14°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Ibiúna 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 Ibiúna 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 Ibiúna 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 Ibiúna is worst in July — around 33 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (January, 17 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateJul 2033 µg/m³Jan 1817 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb17Moderate
Mar18Moderate
Apr20Moderate
May24Moderate
Jun30Moderate
Jul33Moderate
Aug32Moderate
Sep29Moderate
Oct21Moderate
Nov17Moderate
Dec17Moderate
Location & terrain

Where is Ibiúna?

Ibiúna sits at 23.7°S, 47.2°W, 868 m above sea level, in Brazil. The nearest listed city is Mairinque, 13 km away.

Topography around Ibiúna

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

Within 3 km, the terrain around Ibiúna has only modest variations in elevation — a maximum elevation change of 150 m around an average of 876 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 403 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,388 m.

The land around Ibiúna is covered by trees (47%) and grassland (32%) within 3 km, trees (58%) and grassland (31%) within 16 km, and trees (61%) within 80 km.

3 km
150 m
16 km
403 m
80 km
1,388 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Mairinque 13 km · Alumínio 14 km · São Roque 17 km · Vargem Grande Paulista 21 km · Piedade 22 km · Votorantim 25 km · Araçariguama 29 km · Sorocaba 30 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 Ibiúna (-23.6564°, -47.2225°, elevation 868 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).