Bertioga weather in September

In September, Bertioga sees average daytime highs of 23°C and overnight lows near 16°C, with 146 mm of rain across 14.8 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 26% of the time in September, and the air most often feels humid.

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

Daytime high
23°
8th warmest
Overnight low
16°
4th coldest
Rainfall
146 mm
14.8 wet days
Daylight
11 h 54 min
7:03 AM – 6:55 PM
Cloud cover
68%
6th clearest
Wind
8 km/h
1st windiest
Solar energy
4.55 kWh/m²
Travel score
6.0
out of 10

Bertioga 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 Bertioga reaches about 23°C in the afternoon and slips back to 16°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 30°C. Set against its neighbours, September runs on par with August and about 1°C cooler than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12315
22315
32315
42315
52315
62315
72315
82315
92315
102315
112415
122415
132415
142316
152316
162316
172316
182316
192316
202316
212316
222316
232316
242316
252316
262316
272316
282316
292316
302316

Bertioga 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° / 21°40527.313.33.8
Feb28° / 21°3402412.83.9
Mar27° / 20°32925.812.24.2
Apr26° / 18°14616.811.55.6
May23° / 16°11113.210.96.3
Jun23° / 15°829.410.66.9
Jul22° / 14°949.210.76.9
Aug23° / 14°819.811.26.9
Sep23° / 16°14614.811.96.0
Oct24° / 17°1801812.65.4
Nov25° / 18°24321.313.24.8
Dec27° / 20°30224.813.44.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% 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 64%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14951
24951
34852
44753
54654
64555
74456
84357
94159
104060
113961
123961
133862
143862
153763
163664
173565
183466
193367
203268
213268
223070
233070
242971
252872
262773
272674
282575
292476
302476

Chance of precipitation in September

Any precipitation

Bertioga gets around 146 mm of rain over 14.8 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 48% and peaks near 59% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
138
239
339
440
540
641
742
842
943
1043
1143
1244
1344
1445
1546
1647
1748
1849
1951
2052
2153
2254
2355
2456
2557
2658
2759
2859
2959
3059

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 48% of days. Sticky, muggy-or-worse air turns up on roughly 11% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
112414430
211414530
311414530
410404640
510404640
69404650
79394750
88394760
98394760
107384770
117384880
127374880
137364990
146354990
1563450100
1663351100
1773250110
1873151110
1973150120
2073050130
2172951130
2272851140
2372850150
2472750160
2572649170
2672649180
2772549190
2872548201
2972447211
3062447221

Wind in September

Winds average 8 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

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 7:19 AM to 6:48 AM, and sunset from 6:50 PM to 7:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:196:50
211.57:186:50
311.67:176:50
411.67:166:51
511.67:156:51
611.67:146:51
711.77:136:52
811.77:126:52
911.77:116:52
1011.77:096:53
1111.77:086:53
1211.87:076:53
1311.87:066:54
1411.87:056:54
1511.87:046:54
1611.97:036:55
1711.97:026:55
1811.97:016:55
1911.97:006:56
2012.06:596:56
2112.06:586:56
2212.06:566:57
2312.06:556:57
2412.16:546:58
2512.16:536:58
2612.16:526:58
2712.16:516:59
2812.16:506:59
2912.26:496:59
3012.26:487:00

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.55 kWh/m².

For context, solar energy here swings from a low near 3.21 kWh/m² to a high of 5.85 kWh/m² in December across the year — September's 4.55 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.6Bright
74.6Bright
84.6Bright
94.6Bright
104.6Bright
114.6Bright
124.6Bright
134.6Bright
144.6Bright
154.6Bright
164.6Bright
174.6Bright
184.6Bright
194.6Bright
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

Hazard calendar for Bertioga

In seasonPeak

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

Bertioga'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 Bertioga?

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

6.0
Sightseeing
5th-best month of the year
4.9
Beach & pool
6th-best month of the year

September is a reasonable time to visit Bertioga for sightseeing.

What to pack for Bertioga in September

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

In September, Bertioga sees daytime highs around 23°C and nights near 16°C. Pack rain gear. Worth having: light clothes and sun protection. About 15 days see rain.

rain gearlight clothessun protection

Sea temperature near Bertioga in September

The nearest coast averages about 21°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore 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°25°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr26Warm
May24Refreshing
Jun22Refreshing
Jul21Refreshing
Aug21Refreshing
Sep21Refreshing
Oct22Refreshing
Nov23Refreshing
Dec25Warm

UV index in Bertioga in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bertioga peaks around February 10 at about 14 (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 highExtremeFeb 10UV 14Jul 12UV 5
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar10Very high
Apr9Very high
May6High
Jun5High
Jul5Moderate
Aug7High
Sep7Very high
Oct10Extreme
Nov13Extreme
Dec13Extreme

Air quality in Bertioga 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 Bertioga is worst in July — around 52 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (February, 24 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateJul 1451 µg/m³Feb 1225 µg/m³
PM2.5 (µg/m³)Level
Jan25Moderate
Feb24Moderate
Mar26Moderate
Apr28Moderate
May36Poor
Jun49Poor
Jul52Poor
Aug47Poor
Sep41Poor
Oct31Moderate
Nov25Moderate
Dec26Moderate
Location & terrain

Where is Bertioga?

Bertioga sits at 23.9°S, 46.1°W, 8 m above sea level, in Brazil. The nearest listed city is Guarujá, 20 km away.

Topography around Bertioga

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

Within 3 km, the terrain around Bertioga has significant variations in elevation — a maximum elevation change of 272 m around an average of 16 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,178 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,434 m.

The land around Bertioga is covered by water (43%) and trees (26%) within 3 km, trees (53%) and water (39%) within 16 km, and water (45%) and trees (36%) within 80 km.

3 km
272 m
16 km
1,178 m
80 km
1,434 m
treesgrasslandartificial surfacesbare terrainwatermangroves
September weather nearby: Guarujá 20 km · Santos 23 km · São Vicente 28 km · Rio Grande da Serra 29 km · Cubatão 29 km · Praia Grande 32 km · Ribeirão Pires 32 km · Biritiba Mirim 33 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 Bertioga (-23.8544°, -46.1386°, elevation 8 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).