Ilha Grande weather in May

In May, Ilha Grande sees average daytime highs of 29°C and overnight lows near 26°C, with 178 mm of rain across 20.7 wet days and about 11.9 hours of daylight. It is the 8th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 32% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of May to 11 h 48 min by month's end. Set against the rest of the year, May is Ilha Grande's 8th-clearest and 10th-windiest month. For the whole year in context, see Ilha Grande's year-round climate.

Daytime high
29°
8th warmest
Overnight low
26°
10th coldest
Rainfall
178 mm
20.7 wet days
Daylight
11 h 54 min
5:47 AM – 5:40 PM
Cloud cover
59%
8th clearest
Wind
19 km/h
10th windiest
Solar energy
5.26 kWh/m²
Travel score
4.3
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical May day in Ilha Grande reaches about 29°C in the afternoon and slips back to 26°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 30°C. Set against its neighbours, May runs on par with April and on par with June.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12826
22826
32826
42826
52826
62826
72826
82826
92926
102926
112926
122926
132926
142926
152926
162926
172926
182926
192926
202926
212926
222926
232926
242926
252926
262926
272926
282926
292926
302926
312926

How May really feels in Ilha Grande

Once humidity and wind are folded in, May averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Ilha Grande weather by month

How May compares with the rest of the year at a glance. May is the 8th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 26°14621.312.14.3
Feb28° / 26°21123.712.13.9
Mar28° / 25°32328.3123.7
Apr28° / 26°34327.311.93.5
May29° / 26°17820.711.94.3
Jun29° / 26°5111.311.85.5
Jul29° / 26°224.311.96.5
Aug30° / 26°20.411.97.0
Sep29° / 26°10.2127.2
Oct29° / 26°60.812.17.1
Nov29° / 26°71.612.16.8
Dec29° / 26°347.712.25.9

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 19% of May, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
23169
33367
43466
53565
63763
73961
84060
94357
104456
114555
124852
134852
145149
155248
165446
175545
185644
195743
205842
215941
226040
236040
246139
256238
266238
276337
286436
296535
306535
316733

Chance of precipitation in May

Any precipitation

Ilha Grande gets around 178 mm of rain over 20.7 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 67% and peaks near 83% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
183
283
382
481
580
678
777
876
975
1073
1172
1271
1369
1468
1567
1666
1765
1864
1963
2062
2161
2260
2359
2459
2558
2658
2757
2856
2955
3055
3153

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the oppressive band about 54% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
15347
25248
35248
45149
55149
65050
75050
84951
94951
104852
114852
124852
134951
144951
154951
165050
175149
185149
195248
205347
215446
225644
235743
245842
256040
266238
276436
286535
296733
306931
317129

Wind in May

Winds average 19 km/h in May.

Across May, daily wind ranges from about 17 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2620light breeze
2720light breeze
2820light breeze
2920light breeze
3020light breeze
3120light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 54 min at the start of May to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over May. Sunrise moves from 5:47 AM to 5:49 AM, and sunset from 5:42 PM to 5:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:475:42
211.95:475:41
311.95:475:41
411.95:475:41
511.95:475:41
611.95:475:41
711.95:475:40
811.95:475:40
911.95:475:40
1011.95:475:40
1111.95:475:40
1211.95:475:40
1311.95:475:40
1411.95:475:40
1511.95:475:40
1611.95:475:40
1711.95:475:40
1811.95:485:40
1911.95:485:40
2011.95:485:40
2111.95:485:40
2211.95:485:40
2311.95:485:40
2411.95:485:40
2511.95:485:40
2611.95:485:40
2711.95:495:40
2811.95:495:40
2911.95:495:40
3011.85:495:40
3111.85:495:40

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.26 kWh/m².

For context, solar energy here swings from a low near 4.98 kWh/m² to a high of 7.04 kWh/m² in October across the year — May's 5.26 kWh/m² sits near the bottom.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.1Bright
55.1Bright
65.1Bright
75.1Bright
85.2Bright
95.2Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
315.4Bright
Planning a trip in May

Hazard calendar for Ilha Grande

In seasonPeak

In May, Ilha Grande sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Ilha Grande's monsoon runs February–May, when most of the year's rain falls.

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

Is May a good time to visit Ilha Grande?

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

4.3
Sightseeing
8th-best month of the year
5.3
Beach & pool
8th-best month of the year

May is a reasonable time to visit Ilha Grande for sightseeing.

What to pack for Ilha Grande in May

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

In May, Ilha Grande sees daytime highs around 29°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 21 days see rain.

light clothesrain gearsun protection

Sea temperature near Ilha Grande in May

The nearest coast averages about 29°C in May — 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 May at about 29°C and coldest in September near 27°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
Mar29Tropical
Apr29Tropical
May29Tropical
Jun29Tropical
Jul28Warm
Aug27Warm
Sep27Warm
Oct27Warm
Nov28Warm
Dec28Tropical

UV index in Ilha Grande in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Ilha Grande peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 14 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 14UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar16Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Extreme
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Ilha Grande in May

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Ilha Grande is worst in December — around 18 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (August, 6 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateDec 1217 µg/m³Aug 216 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar13Moderate
Apr11Good
May8Good
Jun7Good
Jul9Good
Aug6Good
Sep7Good
Oct10Good
Nov16Moderate
Dec18Moderate
Location & terrain

Where is Ilha Grande?

Ilha Grande sits at 2.9°S, 41.8°W, 0 m above sea level, in Brazil. The nearest listed city is Parnaíba, 7.0 km away.

Topography around Ilha Grande

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

Within 3 km, the terrain around Ilha Grande has only modest variations in elevation — a maximum elevation change of 24 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 45 m; within 80 km, large variations in elevation — a maximum elevation change of 656 m.

The land around Ilha Grande is covered by grassland (49%) and trees (22%) within 3 km, grassland (32%) within 16 km, and trees (38%) and water (35%) within 80 km.

3 km
24 m
16 km
45 m
80 km
656 m
treesshrubsgrasslandartificial surfacesbare terrainwaterwetlandmangroves
May weather nearby: Parnaíba 7.0 km · Araioses 10 km · Luís Correia 17 km · Buriti dos Lopes 36 km · Tutóia 52 km · Cocal 75 km · Paulino Neves 81 km · São Bernardo 88 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 Ilha Grande (-2.8521°, -41.8169°, elevation 0 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).