São Sebastião do Caí weather in April

In April, São Sebastião do Caí sees average daytime highs of 24°C and overnight lows near 15°C, with 142 mm of rain across 11.2 wet days and about 11.3 hours of daylight. It is the 6th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 23°C by the end. The sky is clear or mostly clear about 34% of the time in April, and the air most often feels humid.

Daylight stretches from about 11 h 42 min at the start of April to 10 h 54 min by month's end. Set against the rest of the year, April is São Sebastião do Caí's 4th-clearest and 10th-windiest month. For the whole year in context, see São Sebastião do Caí's year-round climate.

Daytime high
24°
6th warmest
Overnight low
15°
7th coldest
Rainfall
142 mm
11.2 wet days
Daylight
11 h 18 min
7:47 AM – 7:04 PM
Cloud cover
58%
4th clearest
Wind
8 km/h
10th windiest
Solar energy
3.77 kWh/m²
Travel score
6.6
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 26°C in the first days to 23°C by the end.

A typical April day in São Sebastião do Caí reaches about 24°C in the afternoon and slips back to 15°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 29°C. Set against its neighbours, April runs about 3°C cooler than March and about 4°C warmer than May.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12616
22616
32616
42616
52616
62616
72516
82516
92516
102516
112516
122516
132515
142515
152515
162415
172415
182415
192415
202415
212414
222414
232414
242314
252314
262314
272314
282314
292314
302313

São Sebastião do Caí weather by month

How April compares with the rest of the year at a glance. April is the 6th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 19°20917.613.74.7
Feb28° / 19°18016.613.14.8
Mar27° / 18°15415.212.25.8
Apr24° / 15°14211.211.36.6
May21° / 12°13610.410.56.4
Jun19° / 10°14410.310.16.0
Jul19° / 18010.810.36.0
Aug21° / 11°14510.710.96.4
Sep22° / 12°17812.511.86.1
Oct24° / 14°21614.812.76.0
Nov26° / 16°16412.813.56.2
Dec28° / 18°18215.113.95.4

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15149
25149
35248
45248
55248
65248
75248
85248
95149
105149
115149
125050
135050
144852
154852
164852
174753
184753
194654
204654
214753
224753
234753
244753
254654
264753
274753
284753
294753
304753

Chance of precipitation in April

Any precipitation

São Sebastião do Caí gets around 142 mm of rain over 11.2 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 40% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
240
339
439
539
638
738
838
938
1038
1138
1237
1337
1437
1538
1638
1738
1838
1938
2037
2137
2237
2337
2436
2536
2636
2736
2836
2935
3035

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 32% of days. Sticky, muggy-or-worse air turns up on roughly 27% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
191834364
291934354
391934354
4101933344
5101933344
6112033334
7122032334
8122032324
9132132314
10142132303
11142131303
12152232293
13162232283
14162232273
15172332262
16172332262
17182432252
18182432242
19192532231
20202532221
21202632211
22212632201
23222732191
24232731181
25242831170
26252830160
27262830150
28272929140
29292929130
30302929120

Wind in April

Winds average 8 km/h in April.

Across April, daily wind ranges from about 8 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
18calm
28calm
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 April

DaylightNight

Daylight runs from about 11 h 42 min at the start of April to 10 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 48 minutes over April. Sunrise moves from 7:38 AM to 7:56 AM, and sunset from 7:22 PM to 6:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.77:387:22
211.77:397:21
311.77:397:20
411.67:407:18
511.67:417:17
611.67:417:16
711.67:427:15
811.57:427:14
911.57:437:12
1011.57:437:11
1111.47:447:10
1211.47:457:09
1311.47:457:08
1411.37:467:07
1511.37:477:05
1611.37:477:04
1711.37:487:03
1811.27:487:02
1911.27:497:01
2011.27:507:00
2111.17:506:59
2211.17:516:58
2311.17:516:57
2411.17:526:56
2511.07:536:55
2611.07:536:54
2711.07:546:53
2811.07:556:52
2910.97:556:51
3010.97:566:50

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 3.77 kWh/m².

For context, solar energy here swings from a low near 2.41 kWh/m² to a high of 6.44 kWh/m² in December across the year — April's 3.77 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.2Bright
44.2Bright
54.2Bright
64.1Bright
74.1Bright
84.1Bright
94.0Bright
104.0Moderate
113.9Moderate
123.9Moderate
133.9Moderate
143.8Moderate
153.8Moderate
163.7Moderate
173.7Moderate
183.7Moderate
193.6Moderate
203.6Moderate
213.5Moderate
223.5Moderate
233.5Moderate
243.5Moderate
253.4Moderate
263.4Moderate
273.4Moderate
283.3Moderate
293.3Moderate
303.3Moderate
Planning a trip in April

Is April a good time to visit São Sebastião do Caí?

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

6.6
Sightseeing
1st-best month of the year
5.7
Beach & pool
5th-best month of the year

April is a reasonable time to visit São Sebastião do Caí for sightseeing.

What to pack for São Sebastião do Caí in April

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

In April, São Sebastião do Caí sees daytime highs around 24°C and nights near 15°C. Worth packing: light clothes and rain gear. About 11 days see rain.

light clothesrain gear

UV index in São Sebastião do Caí in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April 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 São Sebastião do Caí peaks around January 16 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 16UV 13Jun 20UV 4
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar10Very high
Apr8Very high
May5Moderate
Jun4Moderate
Jul4Moderate
Aug5High
Sep8Very high
Oct8Very high
Nov12Extreme
Dec13Extreme

Air quality in São Sebastião do Caí 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 do Caí is worst in September — around 17 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 10 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1217 µg/m³Dec 1910 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb10Good
Mar10Good
Apr12Good
May12Good
Jun11Good
Jul13Moderate
Aug16Moderate
Sep17Moderate
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is São Sebastião do Caí?

São Sebastião do Caí sits at 29.6°S, 51.4°W, 16 m above sea level, in Brazil. The nearest listed city is Montenegro, 14 km away.

Topography around São Sebastião do Caí

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

Within 3 km, the terrain around São Sebastião do Caí has only modest variations in elevation — a maximum elevation change of 107 m around an average of 32 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 512 m; within 80 km, large variations in elevation — a maximum elevation change of 988 m.

The land around São Sebastião do Caí is covered by trees (69%) within 3 km, trees (73%) within 16 km, and trees (62%) within 80 km.

3 km
107 m
16 km
512 m
80 km
988 m
treesgrasslandcroplandartificial surfaceswaterwetland
April weather nearby: Montenegro 14 km · Portão 18 km · Estância Velha 21 km · Ivoti 21 km · Novo Hamburgo 26 km · Dois Irmãos 28 km · São Leopoldo 29 km · Nova Santa Rita 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 São Sebastião do Caí (-29.5867°, -51.3756°, elevation 16 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).