Ubatuba weather in September

In September, Ubatuba sees average daytime highs of 21°C and overnight lows near 19°C, with 154 mm of rain across 14.2 wet days and about 11.9 hours of daylight. It is the 10th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 37% of the time in September, and the air most often feels muggy.

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 Ubatuba's 6th-clearest and 1st-windiest month. For the whole year in context, see Ubatuba's year-round climate.

Daytime high
21°
10th warmest
Overnight low
19°
3rd coldest
Rainfall
154 mm
14.2 wet days
Daylight
11 h 54 min
6:59 AM – 6:51 PM
Cloud cover
56%
6th clearest
Wind
14 km/h
1st windiest
Solar energy
4.53 kWh/m²
Travel score
6.0
out of 10

Ubatuba 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 21°C through the month.

A typical September day in Ubatuba reaches about 21°C in the afternoon and slips back to 19°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 25°C. Set against its neighbours, September runs on par with August and on par with October.

15°18°20°23°25°151015202530
Avg high (°C)Avg low (°C)
12119
22119
32119
42119
52119
62119
72119
82119
92119
102119
112119
122119
132119
142119
152119
162119
172119
182119
192119
202119
212119
222119
232119
242119
252119
262119
272119
282119
292119
302119

Ubatuba weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 24°20316.113.35.7
Feb26° / 24°1471312.86.0
Mar25° / 23°18915.312.26.0
Apr24° / 22°13412.311.56.7
May22° / 20°12511.910.96.6
Jun22° / 20°1039.910.66.8
Jul21° / 19°1171010.76.8
Aug21° / 19°9310.311.26.7
Sep21° / 19°15414.211.96.0
Oct22° / 20°15815.312.65.7
Nov23° / 21°17215.613.15.7
Dec24° / 22°16414.913.46.0

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 14% of September, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16238
26139
36139
46040
55941
65842
75743
85644
95644
105545
115347
125347
135248
145248
155149
165149
175050
184951
194852
204753
214654
224654
234456
244357
254357
264357
274159
284159
294258
304159

Chance of precipitation in September

Any precipitation

Ubatuba gets around 154 mm of rain over 14.2 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 46% and peaks near 54% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
137
237
338
438
538
639
739
840
940
1041
1142
1242
1343
1444
1545
1646
1747
1848
1949
2050
2151
2252
2353
2453
2553
2654
2754
2854
2954
3054

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 43% of days. Sticky, muggy-or-worse air turns up on roughly 43% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
131351330
231350340
331350350
431349350
521348360
621348370
721248380
821247380
921247390
1021247390
1121147400
1221146410
1321146420
1421145420
1521144430
1621143440
1721142450
1831141450
1931141460
2031140460
2131139460
2231138471
2331237481
2431236481
2531235491
2631234502
2731233502
2831232512
2931132522
3031132513

Wind in September

Winds average 14 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze

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 7:14 AM to 6:44 AM, and sunset from 6:46 PM to 6:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:146:46
211.57:136:46
311.67:126:46
411.67:116:47
511.67:106:47
611.67:096:47
711.77:086:48
811.77:076:48
911.77:066:48
1011.77:056:49
1111.87:046:49
1211.87:036:49
1311.87:026:50
1411.87:016:50
1511.87:006:50
1611.96:596:51
1711.96:586:51
1811.96:566:51
1911.96:556:52
2012.06:546:52
2112.06:536:52
2212.06:526:53
2312.06:516:53
2412.16:506:53
2512.16:496:54
2612.16:486:54
2712.16:476:54
2812.16:466:55
2912.26:456:55
3012.26:446:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.53 kWh/m².

For context, solar energy here swings from a low near 3.31 kWh/m² to a high of 5.79 kWh/m² in December across the year — September's 4.53 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.5Bright
194.5Bright
204.6Bright
214.6Bright
224.6Bright
234.6Bright
244.6Bright
254.6Bright
264.6Bright
274.6Bright
284.6Bright
294.7Bright
304.7Bright
Planning a trip in September

Is September a good time to visit Ubatuba?

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

6.0
Sightseeing
6th-best month of the year
3.8
Beach & pool
12th-best month of the year

September is a reasonable time to visit Ubatuba for sightseeing.

What to pack for Ubatuba in September

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

In September, Ubatuba sees daytime highs around 21°C and nights near 19°C. Pack rain gear. Worth having: sun protection. About 14 days see rain.

rain gearsun protection

Sea temperature near Ubatuba in September

The nearest coast averages about 22°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 21 km away) is warmest in February at about 27°C and coldest in August near 21°C.

The water stays above 20°C all year — warm enough for a swim any month.

20°22°24°26°28°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb27Warm
Mar27Warm
Apr26Warm
May24Refreshing
Jun23Refreshing
Jul22Refreshing
Aug21Refreshing
Sep22Refreshing
Oct22Refreshing
Nov23Refreshing
Dec25Warm

UV index in Ubatuba 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 Ubatuba peaks around January 24 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 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 24UV 14Jul 11UV 5
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar11Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug8Very high
Sep8Very high
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Ubatuba 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 Ubatuba is worst in September — around 18 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (March, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1517 µg/m³Mar 149 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb9Good
Mar9Good
Apr10Good
May12Good
Jun13Moderate
Jul13Moderate
Aug14Moderate
Sep18Moderate
Oct12Moderate
Nov10Good
Dec9Good
Location & terrain

Where is Ubatuba?

Ubatuba sits at 23.4°S, 45.1°W, 6 m above sea level, in Brazil. The nearest listed city is Caraguatatuba, 41 km away.

Topography around Ubatuba

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

Within 3 km, the terrain around Ubatuba has significant variations in elevation — a maximum elevation change of 564 m around an average of 52 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,204 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,891 m.

The land around Ubatuba is covered by trees (41%), water (30%) and artificial surfaces (25%) within 3 km, trees (58%) and water (40%) within 16 km, and water (40%), trees (37%) and grassland (20%) within 80 km.

3 km
564 m
16 km
1,204 m
80 km
1,891 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Caraguatatuba 41 km · Cunha 42 km · Paraty 44 km · Ilhabela 48 km · São Sebastião 50 km · Paraibuna 61 km · Taubaté 67 km · Aparecida 67 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 Ubatuba (-23.4339°, -45.0711°, elevation 6 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).