Itanhaém weather in May

In May, Itanhaém sees average daytime highs of 23°C and overnight lows near 20°C, with 125 mm of rain across 13.5 wet days and about 10.8 hours of daylight. It is the 7th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 22°C by the end. The sky is clear or mostly clear about 37% of the time in May, and the air most often feels muggy.

Daylight stretches from about 11 h 06 min at the start of May to 10 h 36 min by month's end. Set against the rest of the year, May is Itanhaém's 4th-clearest and 8th-windiest month. For the whole year in context, see Itanhaém's year-round climate.

Daytime high
23°
7th warmest
Overnight low
20°
5th coldest
Rainfall
125 mm
13.5 wet days
Daylight
10 h 48 min
7:38 AM – 6:28 PM
Cloud cover
55%
4th clearest
Wind
11 km/h
8th windiest
Solar energy
3.44 kWh/m²
Travel score
6.4
out of 10

Itanhaém is human settlement in Brazil.

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 24°C in the first days to 22°C by the end.

A typical May day in Itanhaém reaches about 23°C in the afternoon and slips back to 20°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 25°C. Set against its neighbours, May runs about 2°C cooler than April and about 1°C warmer than June.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12421
22421
32421
42421
52421
62320
72320
82320
92320
102320
112320
122320
132320
142320
152320
162320
172320
182320
192320
202320
212220
222219
232219
242219
252219
262219
272219
282219
292219
302219
312219

Itanhaém weather by month

How May compares with the rest of the year at a glance. May is the 7th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 24°22722.913.34.6
Feb27° / 24°21119.712.84.7
Mar26° / 23°21221.712.25.0
Apr25° / 22°13714.611.56.2
May23° / 20°12513.510.86.4
Jun22° / 18°10110.410.56.6
Jul21° / 17°10710.410.76.6
Aug21° / 18°8810.111.26.5
Sep21° / 19°14114.211.95.8
Oct23° / 20°15516.712.65.5
Nov24° / 21°1631713.25.6
Dec25° / 23°17419.213.55.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 18% of May, with mostly cloudy or overcast conditions the remaining 45%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26139
36139
46040
55941
65941
75842
85743
95644
105545
115545
125545
135446
145347
155347
165347
175248
185248
195248
205248
215347
225347
235347
245347
255248
265248
275248
285248
295248
305248
315248

Chance of precipitation in May

Any precipitation

Itanhaém gets around 125 mm of rain over 13.5 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 44% and peaks near 44% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
143
243
343
443
543
644
744
844
944
1044
1144
1244
1344
1444
1544
1644
1744
1844
1944
2044
2144
2244
2344
2444
2544
2644
2744
2844
2944
3043
3143

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the muggy band about 43% of days. Sticky, muggy-or-worse air turns up on roughly 49% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
118234918
229244917
329254915
4210264814
5210274813
6211284812
7211294711
8211304710
921132469
1021233468
1121234457
1221235447
1321236446
1421137436
1521138435
1631139425
1731139425
1831140415
1941240414
2041240404
2141240404
2251340403
2351340393
2451440393
2551539382
2661639382
2761639372
2861738372
2961838371
3061838371
3161937361

Wind in May

Winds average 11 km/h in May.

Across May, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2910calm
3010calm
3110calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 06 min at the start of May to 10 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over May. Sunrise moves from 7:31 AM to 7:46 AM, and sunset from 6:38 PM to 6:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.17:316:38
211.17:326:37
311.17:326:36
411.17:326:36
511.07:336:35
611.07:336:34
711.07:346:33
811.07:346:33
911.07:356:32
1010.97:356:32
1110.97:366:31
1210.97:366:30
1310.97:376:30
1410.97:376:29
1510.87:386:29
1610.87:386:28
1710.87:396:28
1810.87:396:27
1910.87:406:27
2010.87:406:27
2110.87:416:26
2210.77:416:26
2310.77:426:25
2410.77:426:25
2510.77:436:25
2610.77:436:25
2710.77:446:24
2810.77:446:24
2910.67:456:24
3010.67:456:24
3110.67:466:23

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 3.44 kWh/m².

For context, solar energy here swings from a low near 3.03 kWh/m² to a high of 5.89 kWh/m² in December across the year — May's 3.44 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.8Moderate
43.8Moderate
53.8Moderate
63.7Moderate
73.7Moderate
83.7Moderate
93.6Moderate
103.6Moderate
113.6Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.4Moderate
163.4Moderate
173.4Moderate
183.3Moderate
193.3Moderate
203.3Moderate
213.3Moderate
223.3Moderate
233.2Moderate
243.2Moderate
253.2Moderate
263.2Moderate
273.2Moderate
283.1Moderate
293.1Moderate
303.1Moderate
313.1Moderate
Planning a trip in May

Is May a good time to visit Itanhaém?

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

6.4
Sightseeing
4th-best month of the year
4.8
Beach & pool
3rd-best month of the year

May is a reasonable time to visit Itanhaém for sightseeing.

What to pack for Itanhaém in May

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

In May, Itanhaém sees daytime highs around 23°C and nights near 20°C. Worth packing: light clothes and rain gear. About 14 days see rain.

light clothesrain gear

Sea temperature near Itanhaém in May

The nearest coast averages about 24°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 18 km away) is warmest in February at about 27°C and coldest in August near 20°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
Aug20Refreshing
Sep21Refreshing
Oct22Refreshing
Nov23Refreshing
Dec25Warm

UV index in Itanhaém in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Itanhaém peaks around January 23 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 highExtremeJan 23UV 14Jul 12UV 5
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar9Very high
Apr8Very high
May7High
Jun6High
Jul5Moderate
Aug7High
Sep7Very high
Oct10Extreme
Nov13Extreme
Dec13Extreme

Air quality in Itanhaém 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 Itanhaém 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 Itanhaém?

Itanhaém sits at 24.2°S, 46.8°W, 12 m above sea level, in Brazil. The nearest listed city is Mongaguá, 20 km away.

Topography around Itanhaém

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

Within 3 km, the terrain around Itanhaém has only modest variations in elevation — a maximum elevation change of 70 m around an average of 3 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 700 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,389 m.

The land around Itanhaém is covered by water (43%) and artificial surfaces (29%) within 3 km, water (48%) and trees (44%) within 16 km, and trees (47%) and water (41%) within 80 km.

3 km
70 m
16 km
700 m
80 km
1,389 m
treesgrasslandartificial surfacesbare terrainwaterwetlandmangroves
May weather nearby: Mongaguá 20 km · Peruíbe 26 km · Embu-Guaçu 39 km · Juquitiba 40 km · São Lourenço da Serra 40 km · Parelheiros 40 km · Itariri 41 km · Praia Grande 44 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 Itanhaém (-24.1831°, -46.7889°, elevation 12 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).