Tietê weather in September

In September, Tietê sees average daytime highs of 28°C and overnight lows near 16°C, with 68 mm of rain across 7.9 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 28°C through the month. The sky is clear or mostly clear about 45% 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 Tietê's 4th-clearest and 1st-windiest month. For the whole year in context, see Tietê's year-round climate.

Daytime high
28°
7th warmest
Overnight low
16°
5th coldest
Rainfall
68 mm
7.9 wet days
Daylight
11 h 54 min
7:09 AM – 7:01 PM
Cloud cover
49%
4th clearest
Wind
11 km/h
1st windiest
Solar energy
5.28 kWh/m²
Travel score
6.2
out of 10

Tietê 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 28°C through the month.

A typical September day in Tietê reaches about 28°C in the afternoon and slips back to 16°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 34°C. Set against its neighbours, September runs about 2°C warmer than August and about 1°C cooler than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12815
22815
32815
42815
52815
62815
72816
82916
92916
102916
112916
122916
132916
142916
152916
162916
172816
182816
192816
202816
212816
222816
232817
242817
252817
262817
272817
282817
292817
302817

How September really feels in Tietê

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.

Tietê 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
Jan30° / 21°24622.413.33.6
Feb30° / 21°16918.312.83.8
Mar30° / 20°12816.712.24.5
Apr28° / 18°537.311.56.3
May26° / 15°556.310.97.4
Jun25° / 14°424.910.68.0
Jul25° / 13°344.210.78.1
Aug27° / 14°344.211.27.7
Sep28° / 16°687.911.96.2
Oct29° / 18°10312.212.55.0
Nov29° / 19°14014.713.14.6
Dec30° / 20°18719.513.43.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% 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 42%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17228
27030
37030
46931
56832
66634
76634
86535
96337
106238
116238
126040
136040
145941
155941
165842
175743
185743
195644
205545
215446
225347
235248
245149
255050
264951
274753
284753
294654
304654

Chance of precipitation in September

Any precipitation

Tietê gets around 68 mm of rain over 7.9 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 26% and peaks near 36% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
118
218
319
419
520
620
721
821
922
1022
1123
1223
1323
1424
1525
1625
1726
1827
1928
2029
2130
2231
2331
2432
2533
2634
2734
2835
2935
3036

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 35% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15134141
25133151
35033161
44933162
54833172
64733182
74633192
84533202
94433203
104234213
114034223
123935233
133736234
143636244
153437254
163337255
173238265
183038265
192938276
202838276
212738287
222638288
232537299
2424362910
2523363011
2623353012
2722343113
2821343214
2921333214
3020323315

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
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
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 7:25 AM to 6:55 AM, and sunset from 6:56 PM to 7:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:256:56
211.67:246:57
311.67:236:57
411.67:226:57
511.67:216:58
611.67:206:58
711.77:196:58
811.77:186:59
911.77:176:59
1011.77:156:59
1111.87:147:00
1211.87:137:00
1311.87:127:00
1411.87:117:01
1511.87:107:01
1611.97:097:01
1711.97:087:02
1811.97:077:02
1911.97:067:02
2012.07:057:02
2112.07:047:03
2212.07:037:03
2312.07:027:03
2412.17:017:04
2512.17:007:04
2612.16:597:04
2712.16:587:05
2812.16:577:05
2912.26:567:05
3012.26:557:06

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.28 kWh/m².

For context, solar energy here swings from a low near 3.54 kWh/m² to a high of 6.02 kWh/m² in November across the year — September's 5.28 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
85.2Bright
95.2Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
Planning a trip in September

Hazard calendar for Tietê

In seasonPeak

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

Tietê's rainy season runs November–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 Tietê?

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

6.2
Sightseeing
6th-best month of the year
7.4
Beach & pool
2nd-best month of the year

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

What to pack for Tietê in September

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

In September, Tietê sees daytime highs around 28°C and nights near 16°C. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

UV index in Tietê 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 Tietê peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (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 5
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar11Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug8Very high
Sep8Very high
Oct11Extreme
Nov13Extreme
Dec13Extreme

Air quality in Tietê 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 Tietê is worst in September — around 22 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (November, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodSep 922 µg/m³Nov 2312 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb13Moderate
Mar13Moderate
Apr14Moderate
May17Moderate
Jun20Moderate
Jul21Moderate
Aug22Moderate
Sep22Moderate
Oct17Moderate
Nov12Good
Dec12Good
Location & terrain

Where is Tietê?

Tietê sits at 23.1°S, 47.7°W, 513 m above sea level, in Brazil. The nearest listed city is Cerquilho, 8.0 km away.

Topography around Tietê

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

Within 3 km, the terrain around Tietê has only modest variations in elevation — a maximum elevation change of 100 m around an average of 503 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 187 m; within 80 km, large variations in elevation — a maximum elevation change of 845 m.

The land around Tietê is covered by grassland (31%), trees (26%) and artificial surfaces (25%) within 3 km, cropland (44%), grassland (31%) and trees (20%) within 16 km, and trees (35%), cropland (30%) and grassland (27%) within 80 km.

3 km
100 m
16 km
187 m
80 km
845 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Cerquilho 8.0 km · Laranjal Paulista 14 km · Boituva 21 km · Porto Feliz 23 km · Capivari 24 km · Iperó 28 km · Cesário Lange 28 km · Rio das Pedras 31 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 Tietê (-23.1019°, -47.7147°, elevation 513 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).