São Luís weather in April

In April, São Luís sees average daytime highs of 28°C and overnight lows near 25°C, with 414 mm of rain across 28.8 wet days and about 11.9 hours of daylight. It is the 10th-warmest and 2nd-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 7% of the time in April, and the air most often feels oppressive.

Daylight stretches from about 12 hours at the start of April to 11 h 54 min by month's end. Set against the rest of the year, April is São Luís's 11th-clearest and 12th-windiest month. For the whole year in context, see São Luís's year-round climate.

Daytime high
28°
10th warmest
Overnight low
25°
3rd coldest
Rainfall
414 mm
28.8 wet days
Daylight
11 h 54 min
5:59 AM – 5:56 PM
Cloud cover
81%
11th clearest
Wind
13 km/h
12th windiest
Solar energy
4.57 kWh/m²
Travel score
3.4
out of 10

São Luís is human settlement in Brazil.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

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 Luís reaches about 28°C in the afternoon and slips back to 25°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, April runs on par with March and on par with May.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12825
22825
32825
42825
52825
62825
72825
82825
92825
102825
112825
122825
132825
142825
152825
162825
172825
182825
192825
202825
212825
222825
232825
242825
252825
262825
272825
282825
292825
302825

How April really feels in São Luís

Once humidity and wind are folded in, April 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

April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

São Luís weather by month

How April compares with the rest of the year at a glance. April is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 25°22125.412.14.0
Feb28° / 25°3032612.13.6
Mar27° / 25°44030.3123.4
Apr28° / 25°41428.811.93.4
May28° / 26°28626.911.93.7
Jun28° / 26°1532311.94.2
Jul29° / 26°1032011.94.7
Aug29° / 26°28911.96.1
Sep29° / 26°113.2127.0
Oct28° / 26°133.612.16.9
Nov29° / 26°276.812.16.3
Dec28° / 26°7315.312.15.2

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 7% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 11% of April, with mostly cloudy or overcast conditions the remaining 82%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11585
21585
31585
41585
51585
61585
71585
81684
91684
101684
111783
121783
131684
141684
151783
161783
171783
181882
191882
201882
211981
221981
231981
241981
251981
262179
272179
282278
292278
302377

Chance of precipitation in April

Any precipitation

São Luís gets around 414 mm of rain over 28.8 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 96% and peaks near 98% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
198
298
398
498
598
697
797
897
997
1096
1196
1296
1396
1496
1596
1696
1796
1896
1995
2095
2195
2295
2395
2495
2595
2694
2794
2894
2994
3094

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the oppressive band about 73% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
17822
27723
37723
47624
57525
67525
77426
87426
97327
107327
117327
127327
137327
147327
157228
167228
177228
187228
197228
207228
217228
227228
237129
247129
257129
267129
277030
287030
296931
306931

Wind in April

Winds average 13 km/h in April, the calmest month.

Across April, daily wind ranges from about 13 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 hours at the start of April to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over April. Sunrise moves from 6:02 AM to 5:57 AM, and sunset from 6:01 PM to 5:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:026:01
212.06:026:01
312.06:026:00
412.06:026:00
512.06:026:00
612.06:015:59
712.06:015:59
812.06:015:59
912.06:015:58
1012.06:005:58
1112.06:005:57
1212.06:005:57
1312.06:005:57
1411.95:595:56
1511.95:595:56
1611.95:595:56
1711.95:595:55
1811.95:595:55
1911.95:595:55
2011.95:585:55
2111.95:585:54
2211.95:585:54
2311.95:585:54
2411.95:585:53
2511.95:585:53
2611.95:585:53
2711.95:575:53
2811.95:575:52
2911.95:575:52
3011.95:575:52

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.57 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.57 kWh/m² to a high of 6.4 kWh/m² in October across the year — April's 4.57 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
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
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.6Bright
Planning a trip in April

Hazard calendar for São Luís

In seasonPeak

In April, São Luís sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

São Luís's monsoon runs January–May, 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 Luís?

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

3.4
Sightseeing
11th-best month of the year
3.7
Beach & pool
11th-best month of the year

April is a weaker month for outdoor sightseeing in São Luís.

What to pack for São Luís in April

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

In April, São Luís sees daytime highs around 28°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 29 days see rain.

light clothesrain gearsun protection

Sea temperature near São Luís in April

The nearest coast averages about 29°C in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 13 km away) is warmest in May at about 29°C and coldest in October near 28°C.

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

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb28Tropical
Mar28Tropical
Apr29Tropical
May29Tropical
Jun29Tropical
Jul28Tropical
Aug28Tropical
Sep28Warm
Oct28Warm
Nov28Warm
Dec28Warm

UV index in São Luís in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 14 (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 Luís peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 17 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 17UV 15Jul 17UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar16Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in São Luís 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 Luís is worst in February — around 18 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (July, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodFeb 2018 µg/m³Jul 157 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb18Moderate
Mar18Moderate
Apr13Moderate
May8Good
Jun7Good
Jul7Good
Aug8Good
Sep9Good
Oct10Good
Nov10Good
Dec11Good
Location & terrain

Where is São Luís?

São Luís sits at 2.5°S, 44.3°W, 29 m above sea level, in Brazil. The nearest listed city is Alcântara, 19 km away.

Topography around São Luís

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

Within 3 km, the terrain around São Luís has only modest variations in elevation — a maximum elevation change of 37 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 65 m; within 80 km, only modest variations in elevation — a maximum elevation change of 102 m.

The land around São Luís is covered by artificial surfaces (38%) and water (33%) within 3 km, water (52%) and trees (20%) within 16 km, and water (36%) and trees (35%) within 80 km.

3 km
37 m
16 km
65 m
80 km
102 m
treesshrubsgrasslandartificial surfacesbare terrainwaterwetlandmangroves
April weather nearby: Alcântara 19 km · Paço do Lumiar 22 km · Raposa 25 km · São José de Ribamar 27 km · Icatu 38 km · Rosário 46 km · Morros 47 km · Bacabeira 49 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 Luís (-2.5297°, -44.3028°, elevation 29 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).