Cacoal weather in May

In May, Cacoal sees average daytime highs of 30°C and overnight lows near 21°C, with 77 mm of rain across 13.4 wet days and about 11.5 hours of daylight. It is the 8th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 24% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 11 h 36 min at the start of May to 11 h 24 min by month's end. Set against the rest of the year, May is Cacoal's 5th-clearest and 5th-windiest month. For the whole year in context, see Cacoal's year-round climate.

Daytime high
30°
8th warmest
Overnight low
21°
4th coldest
Rainfall
77 mm
13.4 wet days
Daylight
11 h 30 min
6:18 AM – 5:46 PM
Cloud cover
62%
5th clearest
Wind
6 km/h
5th windiest
Solar energy
4.58 kWh/m²
Travel score
4.7
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical May day in Cacoal reaches about 30°C in the afternoon and slips back to 21°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 32°C. Set against its neighbours, May runs on par with April and about 1°C cooler than June.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13022
23022
33022
43022
53022
63022
73022
83022
93022
103022
113021
123021
133021
143021
153021
163021
173021
183021
193021
203021
213021
223021
233021
243021
253021
263021
273021
283021
293021
303021
313021

How May really feels in Cacoal

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.

Cacoal weather by month

How May compares with the rest of the year at a glance. May is the 8th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 22°30829.312.62.8
Feb29° / 22°29726.412.42.8
Mar30° / 22°27028.212.12.9
Apr30° / 22°15122.311.83.4
May30° / 21°7713.411.54.7
Jun31° / 20°173.511.35.5
Jul32° / 20°112.111.45.1
Aug33° / 21°264.811.64.0
Sep33° / 22°9014.211.93.1
Oct32° / 23°15721.812.32.8
Nov31° / 23°2392512.52.8
Dec30° / 23°28427.912.72.9

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 20% of May, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13169
23169
33268
43367
53367
63466
73466
83466
93664
103664
113862
123961
133961
144159
154159
164357
174357
184555
194654
204753
214951
224951
235149
245347
255446
265644
275743
285941
296139
306238
316436

Chance of precipitation in May

Any precipitation

Cacoal gets around 77 mm of rain over 13.4 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 43% and peaks near 54% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
154
253
352
452
551
650
749
849
948
1047
1147
1246
1345
1445
1544
1644
1743
1842
1942
2041
2140
2239
2338
2437
2536
2635
2734
2833
2932
3030
3129

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 74% of days. Sticky, muggy-or-worse air turns up on roughly 92% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10148807
20248806
30249796
40259786
502510785
602510785
712510775
812511765
913511755
1013511764
1113512754
1213512754
1313512754
1413513754
1512413764
1612414763
1712414763
1812515743
1912516742
2002517742
2102517742
2201618741
2301619731
2401619731
2501720711
2601721701
2701822681
2801823671
2901825651
3001926631
3101928611

Wind in May

Winds average 6 km/h in May.

Across May, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 36 min at the start of May to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over May. Sunrise moves from 6:15 AM to 6:22 AM, and sunset from 5:51 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:155:51
211.66:155:51
311.66:155:50
411.66:155:50
511.66:165:49
611.66:165:49
711.56:165:49
811.56:165:48
911.56:165:48
1011.56:165:48
1111.56:175:48
1211.56:175:47
1311.56:175:47
1411.56:175:47
1511.56:185:47
1611.56:185:46
1711.56:185:46
1811.56:185:46
1911.56:185:46
2011.46:195:46
2111.46:195:45
2211.46:195:45
2311.46:195:45
2411.46:205:45
2511.46:205:45
2611.46:205:45
2711.46:215:45
2811.46:215:45
2911.46:215:45
3011.46:215:45
3111.46:225:45

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.58 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.58 kWh/m² to a high of 5.88 kWh/m² in October across the year — May's 4.58 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.7Bright
64.7Bright
74.6Bright
84.6Bright
94.6Bright
104.6Bright
114.6Bright
124.6Bright
134.6Bright
144.6Bright
154.6Bright
164.6Bright
174.6Bright
184.6Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.6Bright
304.6Bright
314.6Bright
Planning a trip in May

Hazard calendar for Cacoal

In seasonPeak

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

Cacoal's monsoon runs October–April, 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 Cacoal?

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

4.7
Sightseeing
3rd-best month of the year
6.3
Beach & pool
4th-best month of the year

May is a reasonable time to visit Cacoal for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Cacoal in May

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

In May, Cacoal sees daytime highs around 30°C and nights near 21°C. Pack light clothes. Worth having: rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

UV index in Cacoal in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cacoal peaks around January 22 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 14 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateExtremeJan 22UV 15Sep 14UV 4
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May10Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep3Moderate
Oct11Extreme
Nov14Extreme
Dec14Extreme

Air quality in Cacoal 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 Cacoal is worst in September — around 53 µg/m³ PM2.5 (poor), about 6.8× the cleanest month (July, 8 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateSep 1550 µg/m³Jul 98 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb12Good
Mar12Good
Apr10Good
May9Good
Jun8Good
Jul8Good
Aug31Moderate
Sep53Poor
Oct21Moderate
Nov15Moderate
Dec13Moderate
Location & terrain

Where is Cacoal?

Cacoal sits at 11.4°S, 61.4°W, 197 m above sea level, in Brazil. The nearest listed city is Pimenta Bueno, 38 km away.

Topography around Cacoal

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

Within 3 km, the terrain around Cacoal has only modest variations in elevation — a maximum elevation change of 80 m around an average of 189 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 262 m; within 80 km, significant variations in elevation — a maximum elevation change of 434 m.

The land around Cacoal is covered by artificial surfaces (45%), trees (27%) and grassland (25%) within 3 km, grassland (68%) and trees (27%) within 16 km, and grassland (60%) and trees (39%) within 80 km.

3 km
80 m
16 km
262 m
80 km
434 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Pimenta Bueno 38 km · Espigão dOeste 48 km · Rolim de Moura 56 km · Presidente Médici 58 km · Alta Floresta d'Oeste 81 km · Ji Paraná 83 km · Ouro Preto do Oeste 114 km · São Miguel do Guaporé 141 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 Cacoal (-11.4386°, -61.4472°, elevation 197 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).