Caieiras weather in May

In May, Caieiras sees average daytime highs of 23°C and overnight lows near 14°C, with 66 mm of rain across 7.3 wet days and about 10.9 hours of daylight. It is the 10th-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 comfortable.

Daylight stretches from about 11 h 06 min at the start of May to 10 h 42 min by month's end. Set against the rest of the year, May is Caieiras's 6th-clearest and 7th-windiest month. For the whole year in context, see Caieiras's year-round climate.

Daytime high
23°
10th warmest
Overnight low
14°
4th coldest
Rainfall
66 mm
7.3 wet days
Daylight
10 h 54 min
7:37 AM – 6:30 PM
Cloud cover
55%
6th clearest
Wind
10 km/h
7th windiest
Solar energy
3.71 kWh/m²
Travel score
7.3
out of 10

Caieiras 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 Caieiras reaches about 23°C in the afternoon and slips back to 14°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 27°C. Set against its neighbours, May runs about 3°C cooler than April and on par with June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12515
22415
32415
42415
52415
62415
72414
82414
92414
102314
112314
122314
132314
142314
152314
162314
172314
182314
192314
202314
212313
222213
232213
242213
252213
262213
272213
282213
292213
302213
312213

Caieiras weather by month

How May compares with the rest of the year at a glance. May is the 10th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 19°26723.213.34.4
Feb28° / 19°1952012.84.5
Mar27° / 18°16118.812.25.2
Apr26° / 16°739.711.56.8
May23° / 14°667.310.97.3
Jun22° / 12°495.310.67.7
Jul22° / 12°494.610.77.8
Aug24° / 12°374.811.28.0
Sep25° / 14°919.111.97.0
Oct26° / 16°13214.412.55.9
Nov26° / 17°16916.313.15.5
Dec27° / 18°21020.613.44.8

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 16% of May, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26139
36040
45941
55842
65644
75644
85545
95446
105347
115248
125248
135149
145149
155050
165050
175050
185050
195050
205050
215050
225149
235149
245149
255149
265149
275149
285248
295347
305347
315347

Chance of precipitation in May

Any precipitation

Caieiras gets around 66 mm of rain over 7.3 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 24% and peaks near 25% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
125
224
324
423
523
623
723
823
923
1023
1123
1223
1323
1424
1524
1624
1725
1825
1925
2025
2125
2225
2325
2425
2525
2625
2725
2825
2924
3024
3124

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the comfortable band about 46% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11442396
21642375
31743364
41843353
52044343
62144332
72145322
82245312
92346302
102346292
112447281
122547271
132548261
142548251
152649241
162649231
172750221
182750221
192850211
202950201
212950201
223050200
233149190
243348190
253447180
263547180
273646180
283745180
293844170
303943170
314042171

Wind in May

Winds average 10 km/h in May.

Across May, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
319calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 06 min at the start of May to 10 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over May. Sunrise moves from 7:30 AM to 7:44 AM, and sunset from 6:39 PM to 6:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.17:306:39
211.17:306:38
311.17:316:37
411.17:316:36
511.17:326:36
611.07:326:35
711.07:336:34
811.07:336:34
911.07:346:33
1011.07:346:33
1111.07:346:32
1210.97:356:32
1310.97:356:31
1410.97:366:30
1510.97:366:30
1610.97:376:30
1710.97:376:29
1810.87:386:29
1910.87:386:28
2010.87:396:28
2110.87:396:27
2210.87:406:27
2310.87:406:27
2410.87:416:26
2510.77:416:26
2610.77:426:26
2710.77:426:26
2810.77:436:25
2910.77:436:25
3010.77:446:25
3110.77:446:25

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 3.71 kWh/m².

For context, solar energy here swings from a low near 3.48 kWh/m² to a high of 5.72 kWh/m² in December across the year — May's 3.71 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.1Bright
44.1Bright
54.1Bright
64.0Bright
74.0Moderate
83.9Moderate
93.9Moderate
103.9Moderate
113.8Moderate
123.8Moderate
133.8Moderate
143.7Moderate
153.7Moderate
163.6Moderate
173.6Moderate
183.6Moderate
193.6Moderate
203.5Moderate
213.5Moderate
223.5Moderate
233.5Moderate
243.5Moderate
253.5Moderate
263.5Moderate
273.5Moderate
283.5Moderate
293.5Moderate
303.5Moderate
313.5Moderate
Planning a trip in May

Hazard calendar for Caieiras

In seasonPeak

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

Caieiras's rainy season runs October–March, when most of the year's rain falls.

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

Is May a good time to visit Caieiras?

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

7.3
Sightseeing
4th-best month of the year
5.7
Beach & pool
5th-best month of the year

May is one of the better times to visit Caieiras for general sightseeing.

What to pack for Caieiras in May

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

In May, Caieiras sees daytime highs around 23°C and nights near 14°C. Worth packing: light clothes. About 7 days see rain.

light clothes

UV index in Caieiras 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 Caieiras peaks around January 21 at about 15 (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 21UV 15Jul 12UV 5
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug8Very high
Sep8Very high
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Caieiras 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 Caieiras is worst in June — around 71 µg/m³ PM2.5 (unhealthy), about 2.3× the cleanest month (December, 31 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorUnhealthyPoorModerateJun 2370 µg/m³Dec 2031 µg/m³
PM2.5 (µg/m³)Level
Jan32Moderate
Feb34Moderate
Mar41Poor
Apr48Poor
May62Unhealthy
Jun71Unhealthy
Jul70Unhealthy
Aug60Unhealthy
Sep53Poor
Oct39Poor
Nov32Moderate
Dec31Moderate
Location & terrain

Where is Caieiras?

Caieiras sits at 23.4°S, 46.7°W, 793 m above sea level, in Brazil. The nearest listed city is Perus, 5.0 km away.

Topography around Caieiras

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

Within 3 km, the terrain around Caieiras has only modest variations in elevation — a maximum elevation change of 247 m around an average of 779 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 570 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,708 m.

The land around Caieiras is covered by trees (61%) and artificial surfaces (23%) within 3 km, trees (64%) and artificial surfaces (21%) within 16 km, and trees (56%) and grassland (22%) within 80 km.

3 km
247 m
16 km
570 m
80 km
1,708 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Perus 5.0 km · Franco da Rocha 5.0 km · Jaraguá 9.0 km · Anhanguera 9.0 km · Francisco Morato 9.0 km · Brasilandia 11 km · Cachoeirinha 13 km · Cajamar 14 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 Caieiras (-23.3642°, -46.7406°, elevation 793 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).