Iaçu weather in May

In May, Iaçu sees average daytime highs of 30°C and overnight lows near 21°C, with 18 mm of rain across 5.1 wet days and about 11.4 hours of daylight. It is the 9th-warmest and 8th-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 18% of the time in May, and the air most often feels muggy.

Daylight stretches from about 11 h 36 min at the start of May to 11 h 18 min by month's end. Set against the rest of the year, May is Iaçu's 9th-clearest and 11th-windiest month. For the whole year in context, see Iaçu's year-round climate.

Daytime high: 30°; 9th warmest
Overnight low: 21°; 6th coldest
Rainfall: 18 mm; 5.1 wet days
Daylight: 11 h 24 min; 5:55 AM – 5:19 PM
Cloud cover: 62%; 9th clearest
Wind: 8 km/h; 11th windiest
Solar energy: 3.99 kWh/m²
Travel score: 5.4; out of 10

Iaçu is human settlement in Brazil.

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

← April Iaçu year-round climate June →Best places to visit in May

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

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 Iaçu 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 33°C. Set against its neighbours, May runs about 1°C cooler than April and about 1°C warmer than June.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	31	31	31	31	31	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	29	29
Avg low (°C)	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	20	20	20	20	20	20	20	20	20

	Avg high (°C)	Avg low (°C)
1	31	21
2	31	21
3	31	21
4	31	21
5	31	21
6	30	21
7	30	21
8	30	21
9	30	21
10	30	21
11	30	21
12	30	21
13	30	21
14	30	21
15	30	21
16	30	21
17	30	21
18	30	21
19	30	21
20	30	21
21	30	21
22	30	21
23	30	20
24	30	20
25	30	20
26	30	20
27	30	20
28	30	20
29	30	20
30	29	20
31	29	20

How May really feels in Iaçu

Once humidity and wind are folded in, May averages 5 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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

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

Iaçu weather by month

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

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	32° / 22°	56	6.6	12.7	4.0
Feb	33° / 22°	37	6.1	12.4	3.8
Mar	33° / 22°	53	8.1	12.1	3.9
Apr	31° / 22°	37	7.1	11.7	4.5
May	30° / 21°	18	5.1	11.4	5.4
Jun	29° / 19°	14	4.6	11.3	6.2
Jul	28° / 18°	14	4.8	11.3	6.6
Aug	29° / 18°	11	3.7	11.6	6.3
Sep	30° / 19°	11	2.5	11.9	5.6
Oct	32° / 21°	21	4	12.3	4.7
Nov	32° / 22°	53	7.1	12.6	4.3
Dec	32° / 22°	55	6.6	12.7	4.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 28% of May, with mostly cloudy or overcast conditions the remaining 54%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	49	49	48	47	47	47	45	45	46	44	44	42	42	42	42	43	43	43	43	44	45	46	46	47	47	48	48	49	49	48	48
Cloudier (%)	51	51	52	53	53	53	55	55	54	56	56	58	58	58	58	57	57	57	57	56	55	54	54	53	53	52	52	51	51	52	52

	Clearer (%)	Cloudier (%)
1	49	51
2	49	51
3	48	52
4	47	53
5	47	53
6	47	53
7	45	55
8	45	55
9	46	54
10	44	56
11	44	56
12	42	58
13	42	58
14	42	58
15	42	58
16	43	57
17	43	57
18	43	57
19	43	57
20	44	56
21	45	55
22	46	54
23	46	54
24	47	53
25	47	53
26	48	52
27	48	52
28	49	51
29	49	51
30	48	52
31	48	52

Chance of precipitation in May

Any precipitation

Iaçu gets around 18 mm of rain over 5.1 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 17% and peaks near 20% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	20	20	19	19	18	18	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17

	Rain chance (%)
1	20
2	20
3	19
4	19
5	18
6	18
7	17
8	17
9	17
10	17
11	17
12	17
13	17
14	17
15	17
16	17
17	17
18	17
19	17
20	17
21	17
22	17
23	17
24	17
25	17
26	17
27	17
28	17
29	17
30	17
31	17

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 68% of days. Sticky, muggy-or-worse air turns up on roughly 72% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Comfortable (%)	0	0	0	0	0	0	1	1	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	3	3	3	3	3	3	3
Humid (%)	14	15	16	17	18	19	20	22	23	24	24	25	26	27	28	28	29	29	30	30	30	30	31	31	32	32	33	33	34	35	36
Muggy (%)	78	78	78	77	76	76	74	72	72	71	71	70	69	68	67	66	65	65	64	64	64	65	64	64	62	63	62	62	61	61	60
Oppressive (%)	8	7	6	6	6	5	5	5	4	4	4	4	4	4	4	4	4	4	4	4	4	3	3	3	3	2	2	2	2	1	1

	Comfortable (%)	Humid (%)	Muggy (%)	Oppressive (%)
1	0	14	78	8
2	0	15	78	7
3	0	16	78	6
4	0	17	77	6
5	0	18	76	6
6	0	19	76	5
7	1	20	74	5
8	1	22	72	5
9	1	23	72	4
10	1	24	71	4
11	1	24	71	4
12	1	25	70	4
13	1	26	69	4
14	1	27	68	4
15	1	28	67	4
16	2	28	66	4
17	2	29	65	4
18	2	29	65	4
19	2	30	64	4
20	2	30	64	4
21	2	30	64	4
22	2	30	65	3
23	2	31	64	3
24	2	31	64	3
25	3	32	62	3
26	3	32	63	2
27	3	33	62	2
28	3	33	62	2
29	3	34	61	2
30	3	35	61	1
31	3	36	60	1

Wind in May

Winds average 8 km/h in May.

Across May, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	9	9	9
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	8	calm
2	8	calm
3	8	calm
4	8	calm
5	8	calm
6	8	calm
7	8	calm
8	8	calm
9	8	calm
10	8	calm
11	8	calm
12	8	calm
13	8	calm
14	8	calm
15	8	calm
16	8	calm
17	8	calm
18	8	calm
19	8	calm
20	8	calm
21	8	calm
22	8	calm
23	8	calm
24	8	calm
25	8	calm
26	8	calm
27	8	calm
28	8	calm
29	9	calm
30	9	calm
31	9	calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 36 min at the start of May to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over May. Sunrise moves from 5:51 AM to 5:59 AM, and sunset from 5:25 PM to 5:18 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	11.6	11.5	11.5	11.5	11.5	11.5	11.5	11.5	11.5	11.5	11.5	11.4	11.4	11.4	11.4	11.4	11.4	11.4	11.4	11.4	11.4	11.4	11.4	11.4	11.3	11.3	11.3	11.3	11.3	11.3	11.3
Sunrise (AM)	5:51	5:52	5:52	5:52	5:52	5:52	5:53	5:53	5:53	5:53	5:53	5:54	5:54	5:54	5:54	5:55	5:55	5:55	5:55	5:56	5:56	5:56	5:57	5:57	5:57	5:57	5:58	5:58	5:58	5:59	5:59
Sunset (PM)	5:25	5:24	5:24	5:23	5:23	5:23	5:22	5:22	5:21	5:21	5:21	5:21	5:20	5:20	5:20	5:19	5:19	5:19	5:19	5:19	5:18	5:18	5:18	5:18	5:18	5:18	5:18	5:18	5:18	5:18	5:18

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.6	5:51	5:25
2	11.5	5:52	5:24
3	11.5	5:52	5:24
4	11.5	5:52	5:23
5	11.5	5:52	5:23
6	11.5	5:52	5:23
7	11.5	5:53	5:22
8	11.5	5:53	5:22
9	11.5	5:53	5:21
10	11.5	5:53	5:21
11	11.5	5:53	5:21
12	11.4	5:54	5:21
13	11.4	5:54	5:20
14	11.4	5:54	5:20
15	11.4	5:54	5:20
16	11.4	5:55	5:19
17	11.4	5:55	5:19
18	11.4	5:55	5:19
19	11.4	5:55	5:19
20	11.4	5:56	5:19
21	11.4	5:56	5:18
22	11.4	5:56	5:18
23	11.4	5:57	5:18
24	11.4	5:57	5:18
25	11.3	5:57	5:18
26	11.3	5:57	5:18
27	11.3	5:58	5:18
28	11.3	5:58	5:18
29	11.3	5:58	5:18
30	11.3	5:59	5:18
31	11.3	5:59	5:18

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 3.99 kWh/m².

For context, solar energy here swings from a low near 3.52 kWh/m² to a high of 6.01 kWh/m² in January across the year — May's 3.99 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	4.3	4.3	4.3	4.2	4.2	4.2	4.1	4.1	4.1	4.1	4.0	4.0	4.0	4.0	4.0	4.0	3.9	3.9	3.9	3.9	3.9	3.9	3.9	3.9	3.8	3.8	3.8	3.8	3.8	3.8	3.7
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	4.3	Bright
2	4.3	Bright
3	4.3	Bright
4	4.2	Bright
5	4.2	Bright
6	4.2	Bright
7	4.1	Bright
8	4.1	Bright
9	4.1	Bright
10	4.1	Bright
11	4.0	Bright
12	4.0	Bright
13	4.0	Bright
14	4.0	Moderate
15	4.0	Moderate
16	4.0	Moderate
17	3.9	Moderate
18	3.9	Moderate
19	3.9	Moderate
20	3.9	Moderate
21	3.9	Moderate
22	3.9	Moderate
23	3.9	Moderate
24	3.9	Moderate
25	3.8	Moderate
26	3.8	Moderate
27	3.8	Moderate
28	3.8	Moderate
29	3.8	Moderate
30	3.8	Moderate
31	3.7	Moderate

Planning a trip in May

Is May a good time to visit Iaçu?

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

5.4

Sightseeing

5th-best month of the year

7.4

Beach & pool

5th-best month of the year

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

What to pack for Iaçu in May

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

In May, Iaçu sees daytime highs around 30°C and nights near 21°C. Pack light clothes. About 5 days see rain.

light clothes

UV index in Iaçu in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Iaçu peaks around February 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 9 (very high).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	14	15	14	12	9	9	9	10	11	13	13	12
Level	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	15	Extreme
Mar	14	Extreme
Apr	12	Extreme
May	9	Very high
Jun	9	Very high
Jul	9	Very high
Aug	10	Extreme
Sep	11	Extreme
Oct	13	Extreme
Nov	13	Extreme
Dec	12	Extreme

Location & terrain

Where is Iaçu?

Iaçu sits at 12.8°S, 40.2°W, 240 m above sea level, in Brazil. The nearest listed city is Itaberaba, 29 km away.

Topography around Iaçu

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

Within 3 km, the terrain around Iaçu has only modest variations in elevation — a maximum elevation change of 228 m around an average of 251 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 598 m; within 80 km, large variations in elevation — a maximum elevation change of 928 m.

The land around Iaçu is covered by grassland (61%) within 3 km, grassland (67%) within 16 km, and grassland (58%) and trees (27%) within 80 km.

3 km

228 m

grassland 61%

16 km

598 m

grassland 67%

80 km

928 m

grassland 58%

treesshrubsgrasslandcroplandartificial surfaceswater

← April Iaçu year-round climate June →Best places to visit in May

May weather nearby: Itaberaba 29 km · Boa Vista do Tupim 44 km · Itatim 56 km · Ruy Barbosa 62 km · Amargosa 72 km · Maracás 79 km · Ubaíra 81 km · Castro Alves 85 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

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 Iaçu (-12.7672°, -40.2117°, elevation 240 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	31	21
2	31	21
3	31	21
4	31	21
5	31	21
6	30	21
7	30	21
8	30	21
9	30	21
10	30	21
11	30	21
12	30	21
13	30	21
14	30	21
15	30	21
16	30	21
17	30	21
18	30	21
19	30	21
20	30	21
21	30	21
22	30	21
23	30	20
24	30	20
25	30	20
26	30	20
27	30	20
28	30	20
29	30	20
30	29	20
31	29	20

	Clearer (%)	Cloudier (%)
1	49	51
2	49	51
3	48	52
4	47	53
5	47	53
6	47	53
7	45	55
8	45	55
9	46	54
10	44	56
11	44	56
12	42	58
13	42	58
14	42	58
15	42	58
16	43	57
17	43	57
18	43	57
19	43	57
20	44	56
21	45	55
22	46	54
23	46	54
24	47	53
25	47	53
26	48	52
27	48	52
28	49	51
29	49	51
30	48	52
31	48	52

	Rain chance (%)
1	20
2	20
3	19
4	19
5	18
6	18
7	17
8	17
9	17
10	17
11	17
12	17
13	17
14	17
15	17
16	17
17	17
18	17
19	17
20	17
21	17
22	17
23	17
24	17
25	17
26	17
27	17
28	17
29	17
30	17
31	17

	Comfortable (%)	Humid (%)	Muggy (%)	Oppressive (%)
1	0	14	78	8
2	0	15	78	7
3	0	16	78	6
4	0	17	77	6
5	0	18	76	6
6	0	19	76	5
7	1	20	74	5
8	1	22	72	5
9	1	23	72	4
10	1	24	71	4
11	1	24	71	4
12	1	25	70	4
13	1	26	69	4
14	1	27	68	4
15	1	28	67	4
16	2	28	66	4
17	2	29	65	4
18	2	29	65	4
19	2	30	64	4
20	2	30	64	4
21	2	30	64	4
22	2	30	65	3
23	2	31	64	3
24	2	31	64	3
25	3	32	62	3
26	3	32	63	2
27	3	33	62	2
28	3	33	62	2
29	3	34	61	2
30	3	35	61	1
31	3	36	60	1

	Avg high (°C)	Avg low (°C)
1	31	21
2	31	21
3	31	21
4	31	21
5	31	21
6	30	21
7	30	21
8	30	21
9	30	21
10	30	21
11	30	21
12	30	21
13	30	21
14	30	21
15	30	21
16	30	21
17	30	21
18	30	21
19	30	21
20	30	21
21	30	21
22	30	21
23	30	20
24	30	20
25	30	20
26	30	20
27	30	20
28	30	20
29	30	20
30	29	20
31	29	20

	Clearer (%)	Cloudier (%)
1	49	51
2	49	51
3	48	52
4	47	53
5	47	53
6	47	53
7	45	55
8	45	55
9	46	54
10	44	56
11	44	56
12	42	58
13	42	58
14	42	58
15	42	58
16	43	57
17	43	57
18	43	57
19	43	57
20	44	56
21	45	55
22	46	54
23	46	54
24	47	53
25	47	53
26	48	52
27	48	52
28	49	51
29	49	51
30	48	52
31	48	52

	Rain chance (%)
1	20
2	20
3	19
4	19
5	18
6	18
7	17
8	17
9	17
10	17
11	17
12	17
13	17
14	17
15	17
16	17
17	17
18	17
19	17
20	17
21	17
22	17
23	17
24	17
25	17
26	17
27	17
28	17
29	17
30	17
31	17

	Comfortable (%)	Humid (%)	Muggy (%)	Oppressive (%)
1	0	14	78	8
2	0	15	78	7
3	0	16	78	6
4	0	17	77	6
5	0	18	76	6
6	0	19	76	5
7	1	20	74	5
8	1	22	72	5
9	1	23	72	4
10	1	24	71	4
11	1	24	71	4
12	1	25	70	4
13	1	26	69	4
14	1	27	68	4
15	1	28	67	4
16	2	28	66	4
17	2	29	65	4
18	2	29	65	4
19	2	30	64	4
20	2	30	64	4
21	2	30	64	4
22	2	30	65	3
23	2	31	64	3
24	2	31	64	3
25	3	32	62	3
26	3	32	63	2
27	3	33	62	2
28	3	33	62	2
29	3	34	61	2
30	3	35	61	1
31	3	36	60	1

	Avg high (°C)	Avg low (°C)
1	31	21
2	31	21
3	31	21
4	31	21
5	31	21
6	30	21
7	30	21
8	30	21
9	30	21
10	30	21
11	30	21
12	30	21
13	30	21
14	30	21
15	30	21
16	30	21
17	30	21
18	30	21
19	30	21
20	30	21
21	30	21
22	30	21
23	30	20
24	30	20
25	30	20
26	30	20
27	30	20
28	30	20
29	30	20
30	29	20
31	29	20

	Clearer (%)	Cloudier (%)
1	49	51
2	49	51
3	48	52
4	47	53
5	47	53
6	47	53
7	45	55
8	45	55
9	46	54
10	44	56
11	44	56
12	42	58
13	42	58
14	42	58
15	42	58
16	43	57
17	43	57
18	43	57
19	43	57
20	44	56
21	45	55
22	46	54
23	46	54
24	47	53
25	47	53
26	48	52
27	48	52
28	49	51
29	49	51
30	48	52
31	48	52

	Rain chance (%)
1	20
2	20
3	19
4	19
5	18
6	18
7	17
8	17
9	17
10	17
11	17
12	17
13	17
14	17
15	17
16	17
17	17
18	17
19	17
20	17
21	17
22	17
23	17
24	17
25	17
26	17
27	17
28	17
29	17
30	17
31	17

	Comfortable (%)	Humid (%)	Muggy (%)	Oppressive (%)
1	0	14	78	8
2	0	15	78	7
3	0	16	78	6
4	0	17	77	6
5	0	18	76	6
6	0	19	76	5
7	1	20	74	5
8	1	22	72	5
9	1	23	72	4
10	1	24	71	4
11	1	24	71	4
12	1	25	70	4
13	1	26	69	4
14	1	27	68	4
15	1	28	67	4
16	2	28	66	4
17	2	29	65	4
18	2	29	65	4
19	2	30	64	4
20	2	30	64	4
21	2	30	64	4
22	2	30	65	3
23	2	31	64	3
24	2	31	64	3
25	3	32	62	3
26	3	32	63	2
27	3	33	62	2
28	3	33	62	2
29	3	34	61	2
30	3	35	61	1
31	3	36	60	1