Iaçu weather in December

In December, Iaçu sees average daytime highs of 32°C and overnight lows near 22°C, with 55 mm of rain across 6.6 wet days and about 12.7 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 23% of the time in December, and the air most often feels muggy.

Daylight stretches from about 12 h 42 min at the start of December to 12 h 42 min by month's end. Set against the rest of the year, December is Iaçu's 11th-clearest and 7th-windiest month. For the whole year in context, see Iaçu's year-round climate.

Daytime high: 32°; 4th warmest
Overnight low: 22°; 8th coldest
Rainfall: 55 mm; 6.6 wet days
Daylight: 12 h 42 min; 5:15 AM – 5:59 PM
Cloud cover: 64%; 11th clearest
Wind: 9 km/h; 7th windiest
Solar energy: 5.99 kWh/m²
Travel score: 4.2; out of 10

Iaçu is human settlement in Brazil.

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

← November Iaçu year-round climate January →Best places to visit in December

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical December day in Iaçu reaches about 32°C in the afternoon and slips back to 22°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 35°C. Set against its neighbours, December runs on par with November and on par with January.

	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)	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32
Avg low (°C)	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22

	Avg high (°C)	Avg low (°C)
1	32	22
2	32	22
3	32	22
4	32	22
5	32	22
6	32	22
7	32	22
8	32	22
9	32	22
10	32	22
11	32	22
12	32	22
13	32	22
14	32	22
15	32	22
16	32	22
17	32	22
18	32	22
19	32	22
20	32	22
21	32	22
22	32	22
23	32	22
24	32	22
25	32	22
26	32	22
27	32	22
28	32	22
29	32	22
30	32	22
31	32	22

How December really feels in Iaçu

Once humidity and wind are folded in, December 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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

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

Iaçu weather by month

How December compares with the rest of the year at a glance. December is the 4th-warmest and 2nd-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 December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 22% of December, with mostly cloudy or overcast conditions the remaining 55%.

	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 (%)	40	40	40	41	41	42	42	43	44	44	44	44	44	44	44	46	46	46	46	47	47	47	47	48	47	48	49	50	49	49	50
Cloudier (%)	60	60	60	59	59	58	58	57	56	56	56	56	56	56	56	54	54	54	54	53	53	53	53	52	53	52	51	50	51	51	50

	Clearer (%)	Cloudier (%)
1	40	60
2	40	60
3	40	60
4	41	59
5	41	59
6	42	58
7	42	58
8	43	57
9	44	56
10	44	56
11	44	56
12	44	56
13	44	56
14	44	56
15	44	56
16	46	54
17	46	54
18	46	54
19	46	54
20	47	53
21	47	53
22	47	53
23	47	53
24	48	52
25	47	53
26	48	52
27	49	51
28	50	50
29	49	51
30	49	51
31	50	50

Chance of precipitation in December

Any precipitation

Iaçu gets around 55 mm of rain over 6.6 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 21% and peaks near 25% 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 (%)	25	25	25	25	24	24	24	23	23	23	22	22	22	21	21	21	20	20	20	19	19	19	19	19	19	19	19	19	19	19	19

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

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the muggy band about 73% of days. Sticky, muggy-or-worse air turns up on roughly 86% 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
Humid (%)	14	14	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	14	14	14	13	13	12	12	11	11	11	10	10	9
Muggy (%)	72	72	71	70	70	70	70	70	70	70	70	70	70	70	70	71	71	71	73	73	74	75	75	77	77	78	78	78	79	80	80
Oppressive (%)	14	14	14	15	15	15	15	15	15	15	15	15	15	15	15	14	14	14	13	13	12	12	12	11	11	11	11	11	11	10	11

	Humid (%)	Muggy (%)	Oppressive (%)
1	14	72	14
2	14	72	14
3	15	71	14
4	15	70	15
5	15	70	15
6	15	70	15
7	15	70	15
8	15	70	15
9	15	70	15
10	15	70	15
11	15	70	15
12	15	70	15
13	15	70	15
14	15	70	15
15	15	70	15
16	15	71	14
17	15	71	14
18	15	71	14
19	14	73	13
20	14	73	13
21	14	74	12
22	13	75	12
23	13	75	12
24	12	77	11
25	12	77	11
26	11	78	11
27	11	78	11
28	11	78	11
29	10	79	11
30	10	80	10
31	9	80	11

Wind in December

Winds average 9 km/h in December.

Across December, daily wind ranges from about 9 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)	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	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	9	calm
2	9	calm
3	9	calm
4	9	calm
5	9	calm
6	9	calm
7	9	calm
8	9	calm
9	9	calm
10	9	calm
11	9	calm
12	9	calm
13	9	calm
14	9	calm
15	9	calm
16	9	calm
17	9	calm
18	9	calm
19	9	calm
20	9	calm
21	9	calm
22	9	calm
23	9	calm
24	9	calm
25	9	calm
26	9	calm
27	9	calm
28	9	calm
29	9	calm
30	9	calm
31	9	calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 42 min at the start of December to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 5:10 AM to 5:22 AM, and sunset from 5:52 PM to 6:06 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)	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.8	12.8	12.8	12.8	12.8	12.8	12.8	12.7	12.7	12.7	12.7	12.7	12.7
Sunrise (AM)	5:10	5:10	5:10	5:10	5:11	5:11	5:11	5:12	5:12	5:12	5:13	5:13	5:13	5:14	5:14	5:15	5:15	5:15	5:16	5:16	5:17	5:17	5:18	5:18	5:19	5:19	5:20	5:20	5:21	5:21	5:22
Sunset (PM)	5:52	5:52	5:53	5:53	5:54	5:54	5:55	5:55	5:56	5:56	5:57	5:57	5:58	5:58	5:59	5:59	6:00	6:00	6:01	6:01	6:02	6:02	6:03	6:03	6:04	6:04	6:05	6:05	6:05	6:06	6:06

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.7	5:10	5:52
2	12.7	5:10	5:52
3	12.7	5:10	5:53
4	12.7	5:10	5:53
5	12.7	5:11	5:54
6	12.7	5:11	5:54
7	12.7	5:11	5:55
8	12.7	5:12	5:55
9	12.7	5:12	5:56
10	12.7	5:12	5:56
11	12.7	5:13	5:57
12	12.7	5:13	5:57
13	12.7	5:13	5:58
14	12.7	5:14	5:58
15	12.7	5:14	5:59
16	12.7	5:15	5:59
17	12.7	5:15	6:00
18	12.7	5:15	6:00
19	12.8	5:16	6:01
20	12.8	5:16	6:01
21	12.8	5:17	6:02
22	12.8	5:17	6:02
23	12.8	5:18	6:03
24	12.8	5:18	6:03
25	12.8	5:19	6:04
26	12.7	5:19	6:04
27	12.7	5:20	6:05
28	12.7	5:20	6:05
29	12.7	5:21	6:05
30	12.7	5:21	6:06
31	12.7	5:22	6:06

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.99 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 — December's 5.99 kWh/m² sits near the top of that range.

	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)	5.8	5.8	5.8	5.8	5.8	5.9	5.9	5.9	5.9	6.0	6.0	6.0	6.0	6.0	6.0	6.0	6.0	6.0	6.0	6.0	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense

	Solar energy (kWh/m²)	Level
1	5.8	Bright
2	5.8	Bright
3	5.8	Bright
4	5.8	Bright
5	5.8	Bright
6	5.9	Bright
7	5.9	Bright
8	5.9	Bright
9	5.9	Bright
10	6.0	Bright
11	6.0	Bright
12	6.0	Bright
13	6.0	Bright
14	6.0	Intense
15	6.0	Intense
16	6.0	Intense
17	6.0	Intense
18	6.0	Intense
19	6.0	Intense
20	6.0	Intense
21	6.1	Intense
22	6.1	Intense
23	6.1	Intense
24	6.1	Intense
25	6.1	Intense
26	6.1	Intense
27	6.1	Intense
28	6.1	Intense
29	6.1	Intense
30	6.1	Intense
31	6.1	Intense

Planning a trip in December

Is December a good time to visit Iaçu?

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

4.2

Sightseeing

9th-best month of the year

6.8

Beach & pool

8th-best month of the year

December 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 December

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

In December, Iaçu sees daytime highs around 32°C and nights near 22°C. Pack light clothes. Worth having: sun protection. About 7 days see rain.

light clothessun protection

UV index in Iaçu in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 12 (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

← November Iaçu year-round climate January →Best places to visit in December

December 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	32	22
2	32	22
3	32	22
4	32	22
5	32	22
6	32	22
7	32	22
8	32	22
9	32	22
10	32	22
11	32	22
12	32	22
13	32	22
14	32	22
15	32	22
16	32	22
17	32	22
18	32	22
19	32	22
20	32	22
21	32	22
22	32	22
23	32	22
24	32	22
25	32	22
26	32	22
27	32	22
28	32	22
29	32	22
30	32	22
31	32	22

	Clearer (%)	Cloudier (%)
1	40	60
2	40	60
3	40	60
4	41	59
5	41	59
6	42	58
7	42	58
8	43	57
9	44	56
10	44	56
11	44	56
12	44	56
13	44	56
14	44	56
15	44	56
16	46	54
17	46	54
18	46	54
19	46	54
20	47	53
21	47	53
22	47	53
23	47	53
24	48	52
25	47	53
26	48	52
27	49	51
28	50	50
29	49	51
30	49	51
31	50	50

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

	Humid (%)	Muggy (%)	Oppressive (%)
1	14	72	14
2	14	72	14
3	15	71	14
4	15	70	15
5	15	70	15
6	15	70	15
7	15	70	15
8	15	70	15
9	15	70	15
10	15	70	15
11	15	70	15
12	15	70	15
13	15	70	15
14	15	70	15
15	15	70	15
16	15	71	14
17	15	71	14
18	15	71	14
19	14	73	13
20	14	73	13
21	14	74	12
22	13	75	12
23	13	75	12
24	12	77	11
25	12	77	11
26	11	78	11
27	11	78	11
28	11	78	11
29	10	79	11
30	10	80	10
31	9	80	11

	Avg high (°C)	Avg low (°C)
1	32	22
2	32	22
3	32	22
4	32	22
5	32	22
6	32	22
7	32	22
8	32	22
9	32	22
10	32	22
11	32	22
12	32	22
13	32	22
14	32	22
15	32	22
16	32	22
17	32	22
18	32	22
19	32	22
20	32	22
21	32	22
22	32	22
23	32	22
24	32	22
25	32	22
26	32	22
27	32	22
28	32	22
29	32	22
30	32	22
31	32	22

	Clearer (%)	Cloudier (%)
1	40	60
2	40	60
3	40	60
4	41	59
5	41	59
6	42	58
7	42	58
8	43	57
9	44	56
10	44	56
11	44	56
12	44	56
13	44	56
14	44	56
15	44	56
16	46	54
17	46	54
18	46	54
19	46	54
20	47	53
21	47	53
22	47	53
23	47	53
24	48	52
25	47	53
26	48	52
27	49	51
28	50	50
29	49	51
30	49	51
31	50	50

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

	Humid (%)	Muggy (%)	Oppressive (%)
1	14	72	14
2	14	72	14
3	15	71	14
4	15	70	15
5	15	70	15
6	15	70	15
7	15	70	15
8	15	70	15
9	15	70	15
10	15	70	15
11	15	70	15
12	15	70	15
13	15	70	15
14	15	70	15
15	15	70	15
16	15	71	14
17	15	71	14
18	15	71	14
19	14	73	13
20	14	73	13
21	14	74	12
22	13	75	12
23	13	75	12
24	12	77	11
25	12	77	11
26	11	78	11
27	11	78	11
28	11	78	11
29	10	79	11
30	10	80	10
31	9	80	11

	Avg high (°C)	Avg low (°C)
1	32	22
2	32	22
3	32	22
4	32	22
5	32	22
6	32	22
7	32	22
8	32	22
9	32	22
10	32	22
11	32	22
12	32	22
13	32	22
14	32	22
15	32	22
16	32	22
17	32	22
18	32	22
19	32	22
20	32	22
21	32	22
22	32	22
23	32	22
24	32	22
25	32	22
26	32	22
27	32	22
28	32	22
29	32	22
30	32	22
31	32	22

	Clearer (%)	Cloudier (%)
1	40	60
2	40	60
3	40	60
4	41	59
5	41	59
6	42	58
7	42	58
8	43	57
9	44	56
10	44	56
11	44	56
12	44	56
13	44	56
14	44	56
15	44	56
16	46	54
17	46	54
18	46	54
19	46	54
20	47	53
21	47	53
22	47	53
23	47	53
24	48	52
25	47	53
26	48	52
27	49	51
28	50	50
29	49	51
30	49	51
31	50	50

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

	Humid (%)	Muggy (%)	Oppressive (%)
1	14	72	14
2	14	72	14
3	15	71	14
4	15	70	15
5	15	70	15
6	15	70	15
7	15	70	15
8	15	70	15
9	15	70	15
10	15	70	15
11	15	70	15
12	15	70	15
13	15	70	15
14	15	70	15
15	15	70	15
16	15	71	14
17	15	71	14
18	15	71	14
19	14	73	13
20	14	73	13
21	14	74	12
22	13	75	12
23	13	75	12
24	12	77	11
25	12	77	11
26	11	78	11
27	11	78	11
28	11	78	11
29	10	79	11
30	10	80	10
31	9	80	11