São Sebastião weather in April

In April, São Sebastião sees average daytime highs of 28°C and overnight lows near 18°C, with 71 mm of rain across 11.3 wet days and about 11.7 hours of daylight. It is the 5th-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 35% of the time in April, and the air most often feels humid.

Daylight stretches from about 11 h 54 min at the start of April to 11 h 24 min by month's end. Set against the rest of the year, April is São Sebastião's 6th-clearest and 7th-windiest month. For the whole year in context, see São Sebastião's year-round climate.

Daytime high
28°
5th warmest
Overnight low
18°
6th coldest
Rainfall
71 mm
11.3 wet days
Daylight
11 h 36 min
7:22 AM – 7:01 PM
Cloud cover
55%
6th clearest
Wind
7 km/h
7th windiest
Solar energy
5.14 kWh/m²
Travel score
6.1
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical April day in São Sebastião reaches about 28°C in the afternoon and slips back to 18°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 30°C. Set against its neighbours, April runs on par with March and on par with May.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12819
22819
32819
42819
52819
62819
72819
82819
92819
102818
112818
122818
132818
142818
152818
162818
172818
182818
192818
202818
212818
222818
232818
242818
252818
262817
272817
282817
292817
302817

São Sebastião weather by month

How April compares with the rest of the year at a glance. April is the 5th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°2032112.84.6
Feb28° / 19°16018.212.54.8
Mar28° / 19°18120.112.14.8
Apr28° / 18°7111.311.76.1
May27° / 16°173.211.37.7
Jun27° / 14°40.611.18.4
Jul27° / 14°0011.18.6
Aug29° / 15°51.211.57.5
Sep30° / 18°284.811.95.6
Oct30° / 19°10413.312.44.6
Nov28° / 19°20121.212.74.3
Dec28° / 19°22523.212.94.3

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 22% of April, with mostly cloudy or overcast conditions the remaining 43%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14456
24555
34654
44753
54951
64951
74951
85050
95050
105248
115347
125446
135446
145644
155743
165842
175842
185941
195941
206139
216238
226337
236436
246535
256733
266733
276832
286832
297030
307030

Chance of precipitation in April

Any precipitation

São Sebastião gets around 71 mm of rain over 11.3 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 55% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
155
254
353
452
552
651
750
849
948
1047
1146
1245
1343
1442
1540
1638
1736
1835
1933
2031
2130
2228
2326
2424
2523
2621
2720
2818
2917
3016

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the humid band about 43% of days. Sticky, muggy-or-worse air turns up on roughly 42% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1033364
2043462
3043462
4053461
5053560
6153559
7163657
8163657
9163756
10173854
11174052
12184150
13194248
14194446
151104544
160114642
170124740
180134838
190144936
200165034
210175132
220195130
231215028
241235026
251255024
261274923
272294821
282314820
292334718
303354617

Wind in April

Winds average 7 km/h in April.

Across April, 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
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 11 h 54 min at the start of April to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over April. Sunrise moves from 7:20 AM to 7:25 AM, and sunset from 7:12 PM to 6:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.97:207:12
211.97:207:11
311.87:207:10
411.87:207:09
511.87:207:09
611.87:207:08
711.87:217:07
811.87:217:06
911.77:217:06
1011.77:217:05
1111.77:217:04
1211.77:217:03
1311.77:227:03
1411.77:227:02
1511.77:227:01
1611.67:227:01
1711.67:227:00
1811.67:226:59
1911.67:236:59
2011.67:236:58
2111.67:236:57
2211.67:236:57
2311.57:236:56
2411.57:246:55
2511.57:246:55
2611.57:246:54
2711.57:246:54
2811.57:246:53
2911.57:256:52
3011.47:256:52

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.14 kWh/m².

For context, solar energy here swings from a low near 4.62 kWh/m² to a high of 6.14 kWh/m² in October across the year — April's 5.14 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.1Bright
135.1Bright
145.1Bright
155.1Bright
165.1Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.1Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
Planning a trip in April

Hazard calendar for São Sebastião

In seasonPeak

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

São Sebastião's monsoon runs October–March, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is April a good time to visit São Sebastião?

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

6.1
Sightseeing
5th-best month of the year
6.6
Beach & pool
6th-best month of the year

April is a reasonable time to visit São Sebastião for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for São Sebastião in April

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

In April, São Sebastião sees daytime highs around 28°C and nights near 18°C. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in São Sebastião in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in São Sebastião peaks around February 15 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 8 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 15UV 16Jun 23UV 8
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar15Extreme
Apr12Extreme
May10Very high
Jun8Very high
Jul8Very high
Aug10Very high
Sep13Extreme
Oct13Extreme
Nov15Extreme
Dec13Extreme

Air quality in São Sebastião in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.

Air quality in São Sebastião is worst in September — around 32 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (January, 11 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateSep 1830 µg/m³Jan 1511 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar15Moderate
Apr14Moderate
May15Moderate
Jun13Moderate
Jul13Moderate
Aug15Moderate
Sep32Moderate
Oct21Moderate
Nov13Moderate
Dec12Moderate
Location & terrain

Where is São Sebastião?

São Sebastião sits at 15.9°S, 47.8°W, 1,048 m above sea level, in Brazil. The nearest listed city is Jardim Botânico, 6.0 km away.

Topography around São Sebastião

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

Within 3 km, the terrain around São Sebastião has only modest variations in elevation — a maximum elevation change of 233 m around an average of 968 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 343 m; within 80 km, large variations in elevation — a maximum elevation change of 779 m.

The land around São Sebastião is covered by grassland (34%), artificial surfaces (31%) and trees (23%) within 3 km, grassland (39%), trees (24%) and shrubs (21%) within 16 km, and grassland (34%), trees (25%) and cropland (22%) within 80 km.

3 km
233 m
16 km
343 m
80 km
779 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Jardim Botânico 6.0 km · Lago Sul 13 km · Paranoá 14 km · Plano Piloto 17 km · Itapoã 17 km · Park Way 18 km · Sudoeste/Octagonal 20 km · Lago Norte 20 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 São Sebastião (-15.9029°, -47.7761°, elevation 1,048 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).