Guajará Mirim weather in May

In May, Guajará Mirim sees average daytime highs of 30°C and overnight lows near 22°C, with 81 mm of rain across 15.5 wet days and about 11.5 hours of daylight. It is the 12th-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 15% 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 Guajará Mirim's 5th-clearest and 10th-windiest month. For the whole year in context, see Guajará Mirim's year-round climate.

Daytime high
30°
12th warmest
Overnight low
22°
4th coldest
Rainfall
81 mm
15.5 wet days
Daylight
11 h 30 min
6:32 AM – 6:03 PM
Cloud cover
68%
5th clearest
Wind
6 km/h
10th windiest
Solar energy
4.27 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 30°C through the month.

A typical May day in Guajará Mirim reaches about 30°C in the afternoon and slips back to 22°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 33°C. Set against its neighbours, May runs on par with April and on par with June.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13022
23022
33022
43022
53022
63022
73022
83022
93022
103022
113022
123022
133022
143022
153022
163022
173022
183022
193022
203022
213022
223022
233022
243022
253022
263022
273022
283022
293021
303021
313021

How May really feels in Guajará Mirim

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.

Guajará Mirim weather by month

How May compares with the rest of the year at a glance. May is the 12th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°26527.512.62.8
Feb30° / 23°2562512.42.8
Mar30° / 23°25727.212.12.8
Apr30° / 23°16522.911.83.2
May30° / 22°8115.511.54.3
Jun30° / 21°336.811.45.3
Jul31° / 20°214.111.45.2
Aug33° / 21°365.611.64.0
Sep33° / 22°8513.711.93.1
Oct33° / 23°15120.812.22.7
Nov31° / 23°20723.812.52.7
Dec31° / 23°26327.112.62.7

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 21% of May, with mostly cloudy or overcast conditions the remaining 64%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12575
22773
32773
42773
52872
62971
72971
83070
93070
103070
113169
123268
133268
143268
153466
163466
173565
183664
193664
203862
213961
224060
234159
244357
254456
264555
274654
284951
294951
305149
315248

Chance of precipitation in May

Any precipitation

Guajará Mirim gets around 81 mm of rain over 15.5 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 50% and peaks near 64% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
164
263
362
461
560
659
758
857
956
1055
1155
1254
1353
1452
1552
1651
1750
1849
1948
2047
2146
2245
2344
2443
2542
2641
2740
2839
2938
3037
3135

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 51% of days. Sticky, muggy-or-worse air turns up on roughly 94% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
12384344
22484443
32484442
42494541
52494540
62494639
72494638
83494737
93494737
1034104736
1134104835
1234104835
1334104835
1434114934
1533114934
1623124933
1723125132
1823135131
1923135230
2023145229
2123145328
2223155327
2323155525
2423165524
2523165623
2623165722
2723165920
2824175819
2924175918
3024176116
3124176215

Wind in May

Winds average 6 km/h in May.

Across May, daily wind ranges from about 6 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
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
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 6:30 AM to 6:36 AM, and sunset from 6:07 PM to 6:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:306:07
211.66:306:07
311.66:306:06
411.66:306:06
511.66:306:06
611.66:316:05
711.66:316:05
811.66:316:05
911.66:316:04
1011.66:316:04
1111.56:316:04
1211.56:326:04
1311.56:326:03
1411.56:326:03
1511.56:326:03
1611.56:326:03
1711.56:336:03
1811.56:336:02
1911.56:336:02
2011.56:336:02
2111.56:346:02
2211.56:346:02
2311.56:346:02
2411.56:346:02
2511.56:356:02
2611.46:356:01
2711.46:356:01
2811.46:356:01
2911.46:366:01
3011.46:366:01
3111.46:366:01

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.27 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.27 kWh/m² to a high of 5.6 kWh/m² in September across the year — May's 4.27 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.4Bright
54.4Bright
64.4Bright
74.4Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
314.2Bright
Planning a trip in May

Hazard calendar for Guajará Mirim

In seasonPeak

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

Guajará Mirim's rainy season runs October–April, 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 Guajará Mirim?

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

4.3
Sightseeing
3rd-best month of the year
5.9
Beach & pool
4th-best month of the year

May is a reasonable time to visit Guajará Mirim for sightseeing.

What to pack for Guajará Mirim in May

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

In May, Guajará Mirim sees daytime highs around 30°C and nights near 22°C. Pack light clothes and rain gear. About 16 days see rain.

light clothesrain gear

UV index in Guajará Mirim 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 Guajará Mirim peaks around January 20 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 13 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 20UV 15Sep 13UV 4
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar14Extreme
Apr13Extreme
May10Extreme
Jun9Very high
Jul8Very high
Aug7High
Sep4Moderate
Oct12Extreme
Nov13Extreme
Dec14Extreme

Air quality in Guajará Mirim 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 Guajará Mirim is worst in September — around 78 µg/m³ PM2.5 (unhealthy), about 9.3× the cleanest month (May, 8 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateUnhealthyModerateSep 1275 µg/m³May 218 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb13Moderate
Mar13Moderate
Apr10Good
May8Good
Jun9Good
Jul16Moderate
Aug63Unhealthy
Sep78Unhealthy
Oct29Moderate
Nov17Moderate
Dec12Moderate
Location & terrain

Where is Guajará Mirim?

Guajará Mirim sits at 10.8°S, 65.3°W, 131 m above sea level, in Brazil. The nearest listed city is Guayaramerín, 5.0 km away.

Alto ParaísoAriquemes

Topography around Guajará Mirim

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

Within 3 km, the terrain around Guajará Mirim has only modest variations in elevation — a maximum elevation change of 44 m around an average of 124 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 247 m; within 80 km, significant variations in elevation — a maximum elevation change of 365 m.

The land around Guajará Mirim is covered by trees (37%), artificial surfaces (24%) and water (20%) within 3 km, grassland (48%) and trees (44%) within 16 km, and trees (84%) within 80 km.

3 km
44 m
16 km
247 m
80 km
365 m
treesgrasslandartificial surfaceswaterwetland
May weather nearby: Guayaramerín 5.0 km · Nova Mamoré 42 km · Riberalta 82 km · Buritis 177 km · Plácido de Castro 208 km · São Francisco do Guaporé 239 km · Alto Paraíso 251 km · Ariquemes 269 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 Guajará Mirim (-10.7836°, -65.3355°, elevation 131 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).