Açu weather in December

In December, Açu sees average daytime highs of 36°C and overnight lows near 24°C, with 10 mm of rain across 2.5 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 36°C through the month. The sky is clear or mostly clear about 43% of the time in December, and the air most often feels muggy.

Daylight stretches from about 12 h 18 min at the start of December to 12 h 18 min by month's end. Set against the rest of the year, December is Açu's 6th-clearest and 5th-windiest month. For the whole year in context, see Açu's year-round climate.

Daytime high: 36°; 3rd warmest
Overnight low: 24°; 11th coldest
Rainfall: 10 mm; 2.5 wet days
Daylight: 12 h 18 min; 5:14 AM – 5:33 PM
Cloud cover: 50%; 6th clearest
Wind: 17 km/h; 5th windiest
Solar energy: 6.32 kWh/m²
Travel score: 2.6; out of 10

Açu is human settlement in Brazil.

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

← November Açu 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 36°C through the month.

A typical December day in Açu reaches about 36°C in the afternoon and slips back to 24°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 34°C and 37°C. Set against its neighbours, December runs on par with November and about 1°C warmer than 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)	36	36	36	36	36	36	36	36	36	36	36	36	36	36	36	36	36	36	36	36	36	36	36	35	35	35	35	35	35	35	35
Avg low (°C)	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	25	25	25	25	25	25	25

	Avg high (°C)	Avg low (°C)
1	36	24
2	36	24
3	36	24
4	36	24
5	36	24
6	36	24
7	36	24
8	36	24
9	36	24
10	36	24
11	36	24
12	36	24
13	36	24
14	36	24
15	36	24
16	36	24
17	36	24
18	36	24
19	36	24
20	36	24
21	36	24
22	36	24
23	36	24
24	35	24
25	35	25
26	35	25
27	35	25
28	35	25
29	35	25
30	35	25
31	35	25

How December really feels in Açu

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.

Açu weather by month

How December compares with the rest of the year at a glance. December is the 3rd-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	35° / 24°	50	8.7	12.3	2.7
Feb	34° / 24°	63	10.5	12.2	2.8
Mar	33° / 24°	92	14.8	12	2.9
Apr	33° / 24°	86	13.3	11.9	3.2
May	33° / 24°	40	6.7	11.7	3.6
Jun	33° / 23°	24	4.3	11.7	4.1
Jul	33° / 22°	15	2.4	11.7	4.2
Aug	34° / 22°	3	0.4	11.8	3.7
Sep	35° / 23°	1	0.1	12	3.1
Oct	36° / 23°	1	0.1	12.1	2.7
Nov	36° / 24°	2	0.4	12.3	2.7
Dec	36° / 24°	10	2.5	12.3	2.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% 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 36%. Skies tend to cloud over as the month goes on.

	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 (%)	70	70	70	70	69	69	69	69	68	68	68	68	67	67	66	66	64	64	62	62	61	61	61	60	60	60	58	58	58	57	56
Cloudier (%)	30	30	30	30	31	31	31	31	32	32	32	32	33	33	34	34	36	36	38	38	39	39	39	40	40	40	42	42	42	43	44

	Clearer (%)	Cloudier (%)
1	70	30
2	70	30
3	70	30
4	70	30
5	69	31
6	69	31
7	69	31
8	69	31
9	68	32
10	68	32
11	68	32
12	68	32
13	67	33
14	67	33
15	66	34
16	66	34
17	64	36
18	64	36
19	62	38
20	62	38
21	61	39
22	61	39
23	61	39
24	60	40
25	60	40
26	60	40
27	58	42
28	58	42
29	58	42
30	57	43
31	56	44

Chance of precipitation in December

Any precipitation

Açu gets around 10 mm of rain over 2.5 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 8% and peaks near 16% on the wettest days. The odds climb toward the end of the month.

	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 (%)	2	2	2	3	3	3	4	4	5	5	6	6	7	7	7	8	8	9	9	10	10	11	11	12	12	13	14	14	15	16	16

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

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 75% of days. Sticky, muggy-or-worse air turns up on roughly 93% 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 (%)	10	10	9	9	9	8	8	7	7	7	7	7	7	7	7	7	7	8	8	8	8	8	8	8	7	7	7	7	6	6	5
Muggy (%)	81	80	80	80	79	79	79	79	78	78	77	77	76	76	76	76	75	74	74	73	73	72	71	70	70	69	68	67	67	67	67
Oppressive (%)	9	10	11	11	12	13	13	14	15	15	16	16	17	17	17	17	18	18	18	19	19	20	21	22	23	24	25	26	27	27	28

	Humid (%)	Muggy (%)	Oppressive (%)
1	10	81	9
2	10	80	10
3	9	80	11
4	9	80	11
5	9	79	12
6	8	79	13
7	8	79	13
8	7	79	14
9	7	78	15
10	7	78	15
11	7	77	16
12	7	77	16
13	7	76	17
14	7	76	17
15	7	76	17
16	7	76	17
17	7	75	18
18	8	74	18
19	8	74	18
20	8	73	19
21	8	73	19
22	8	72	20
23	8	71	21
24	8	70	22
25	7	70	23
26	7	69	24
27	7	68	25
28	7	67	26
29	6	67	27
30	6	67	27
31	5	67	28

Wind in December

Winds average 17 km/h in December.

Across December, daily wind ranges from about 16 km/h on the calmest days to 18 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)	18	18	18	18	18	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	16	16	16	16	16	16
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

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

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 18 min at the start of December to 12 h 18 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 5:08 AM to 5:21 AM, and sunset from 5:26 PM to 5:40 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)	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3	12.3
Sunrise (AM)	5:08	5:09	5:09	5:09	5:10	5:10	5:10	5:11	5:11	5:12	5:12	5:12	5:13	5:13	5:14	5:14	5:15	5:15	5:16	5:16	5:16	5:17	5:17	5:18	5:18	5:19	5:19	5:20	5:20	5:21	5:21
Sunset (PM)	5:26	5:27	5:27	5:28	5:28	5:29	5:29	5:30	5:30	5:31	5:31	5:32	5:32	5:32	5:33	5:33	5:34	5:34	5:35	5:35	5:36	5:36	5:37	5:37	5:38	5:38	5:39	5:39	5:40	5:40	5:40

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.3	5:08	5:26
2	12.3	5:09	5:27
3	12.3	5:09	5:27
4	12.3	5:09	5:28
5	12.3	5:10	5:28
6	12.3	5:10	5:29
7	12.3	5:10	5:29
8	12.3	5:11	5:30
9	12.3	5:11	5:30
10	12.3	5:12	5:31
11	12.3	5:12	5:31
12	12.3	5:12	5:32
13	12.3	5:13	5:32
14	12.3	5:13	5:32
15	12.3	5:14	5:33
16	12.3	5:14	5:33
17	12.3	5:15	5:34
18	12.3	5:15	5:34
19	12.3	5:16	5:35
20	12.3	5:16	5:35
21	12.3	5:16	5:36
22	12.3	5:17	5:36
23	12.3	5:17	5:37
24	12.3	5:18	5:37
25	12.3	5:18	5:38
26	12.3	5:19	5:38
27	12.3	5:19	5:39
28	12.3	5:20	5:39
29	12.3	5:20	5:40
30	12.3	5:21	5:40
31	12.3	5:21	5:40

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.32 kWh/m².

For context, solar energy here swings from a low near 4.66 kWh/m² to a high of 6.8 kWh/m² in October across the year — December's 6.32 kWh/m² falls in the middle.

	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)	6.5	6.5	6.5	6.5	6.5	6.4	6.4	6.4	6.4	6.4	6.4	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.1
Level	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense

	Solar energy (kWh/m²)	Level
1	6.5	Intense
2	6.5	Intense
3	6.5	Intense
4	6.5	Intense
5	6.5	Intense
6	6.4	Intense
7	6.4	Intense
8	6.4	Intense
9	6.4	Intense
10	6.4	Intense
11	6.4	Intense
12	6.3	Intense
13	6.3	Intense
14	6.3	Intense
15	6.3	Intense
16	6.3	Intense
17	6.3	Intense
18	6.3	Intense
19	6.3	Intense
20	6.3	Intense
21	6.2	Intense
22	6.2	Intense
23	6.2	Intense
24	6.2	Intense
25	6.2	Intense
26	6.2	Intense
27	6.2	Intense
28	6.2	Intense
29	6.2	Intense
30	6.2	Intense
31	6.1	Intense

Planning a trip in December

Is December a good time to visit Açu?

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

2.6

Sightseeing

12th-best month of the year

6.0

Beach & pool

8th-best month of the year

December is a weaker month for outdoor sightseeing in Açu. The water and warmth also suit a beach or pool day.

What to pack for Açu in December

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

In December, Açu sees daytime highs around 36°C and nights near 24°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Açu 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 Açu peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 14 at about 10 (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)	13	14	15	14	11	10	10	10	12	12	12	12
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Extreme	Extreme	Extreme	Extreme	Extreme

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

Location & terrain

Where is Açu?

Açu sits at 5.6°S, 36.9°W, 36 m above sea level, in Brazil. The nearest listed city is Jucurutu, 52 km away.

Topography around Açu

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

Within 3 km, the terrain around Açu has only modest variations in elevation — a maximum elevation change of 78 m around an average of 37 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 132 m; within 80 km, large variations in elevation — a maximum elevation change of 749 m.

The land around Açu is covered by grassland (35%) and artificial surfaces (22%) within 3 km, shrubs (49%) and grassland (35%) within 16 km, and shrubs (66%) and grassland (20%) within 80 km.

3 km

78 m

grassland 35%

16 km

132 m

shrubs 49%

80 km

749 m

shrubs 66%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland

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

December weather nearby: Jucurutu 52 km · Macau 60 km · Mossoró 65 km · Areia Branca 73 km · Lagoa Nova 75 km · Caraúbas 76 km · Guamaré 83 km · Currais Novos 87 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 Açu (-5.5767°, -36.9086°, elevation 36 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	36	24
2	36	24
3	36	24
4	36	24
5	36	24
6	36	24
7	36	24
8	36	24
9	36	24
10	36	24
11	36	24
12	36	24
13	36	24
14	36	24
15	36	24
16	36	24
17	36	24
18	36	24
19	36	24
20	36	24
21	36	24
22	36	24
23	36	24
24	35	24
25	35	25
26	35	25
27	35	25
28	35	25
29	35	25
30	35	25
31	35	25

	Clearer (%)	Cloudier (%)
1	70	30
2	70	30
3	70	30
4	70	30
5	69	31
6	69	31
7	69	31
8	69	31
9	68	32
10	68	32
11	68	32
12	68	32
13	67	33
14	67	33
15	66	34
16	66	34
17	64	36
18	64	36
19	62	38
20	62	38
21	61	39
22	61	39
23	61	39
24	60	40
25	60	40
26	60	40
27	58	42
28	58	42
29	58	42
30	57	43
31	56	44

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

	Humid (%)	Muggy (%)	Oppressive (%)
1	10	81	9
2	10	80	10
3	9	80	11
4	9	80	11
5	9	79	12
6	8	79	13
7	8	79	13
8	7	79	14
9	7	78	15
10	7	78	15
11	7	77	16
12	7	77	16
13	7	76	17
14	7	76	17
15	7	76	17
16	7	76	17
17	7	75	18
18	8	74	18
19	8	74	18
20	8	73	19
21	8	73	19
22	8	72	20
23	8	71	21
24	8	70	22
25	7	70	23
26	7	69	24
27	7	68	25
28	7	67	26
29	6	67	27
30	6	67	27
31	5	67	28

	Avg high (°C)	Avg low (°C)
1	36	24
2	36	24
3	36	24
4	36	24
5	36	24
6	36	24
7	36	24
8	36	24
9	36	24
10	36	24
11	36	24
12	36	24
13	36	24
14	36	24
15	36	24
16	36	24
17	36	24
18	36	24
19	36	24
20	36	24
21	36	24
22	36	24
23	36	24
24	35	24
25	35	25
26	35	25
27	35	25
28	35	25
29	35	25
30	35	25
31	35	25

	Clearer (%)	Cloudier (%)
1	70	30
2	70	30
3	70	30
4	70	30
5	69	31
6	69	31
7	69	31
8	69	31
9	68	32
10	68	32
11	68	32
12	68	32
13	67	33
14	67	33
15	66	34
16	66	34
17	64	36
18	64	36
19	62	38
20	62	38
21	61	39
22	61	39
23	61	39
24	60	40
25	60	40
26	60	40
27	58	42
28	58	42
29	58	42
30	57	43
31	56	44

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

	Humid (%)	Muggy (%)	Oppressive (%)
1	10	81	9
2	10	80	10
3	9	80	11
4	9	80	11
5	9	79	12
6	8	79	13
7	8	79	13
8	7	79	14
9	7	78	15
10	7	78	15
11	7	77	16
12	7	77	16
13	7	76	17
14	7	76	17
15	7	76	17
16	7	76	17
17	7	75	18
18	8	74	18
19	8	74	18
20	8	73	19
21	8	73	19
22	8	72	20
23	8	71	21
24	8	70	22
25	7	70	23
26	7	69	24
27	7	68	25
28	7	67	26
29	6	67	27
30	6	67	27
31	5	67	28

	Avg high (°C)	Avg low (°C)
1	36	24
2	36	24
3	36	24
4	36	24
5	36	24
6	36	24
7	36	24
8	36	24
9	36	24
10	36	24
11	36	24
12	36	24
13	36	24
14	36	24
15	36	24
16	36	24
17	36	24
18	36	24
19	36	24
20	36	24
21	36	24
22	36	24
23	36	24
24	35	24
25	35	25
26	35	25
27	35	25
28	35	25
29	35	25
30	35	25
31	35	25

	Clearer (%)	Cloudier (%)
1	70	30
2	70	30
3	70	30
4	70	30
5	69	31
6	69	31
7	69	31
8	69	31
9	68	32
10	68	32
11	68	32
12	68	32
13	67	33
14	67	33
15	66	34
16	66	34
17	64	36
18	64	36
19	62	38
20	62	38
21	61	39
22	61	39
23	61	39
24	60	40
25	60	40
26	60	40
27	58	42
28	58	42
29	58	42
30	57	43
31	56	44

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

	Humid (%)	Muggy (%)	Oppressive (%)
1	10	81	9
2	10	80	10
3	9	80	11
4	9	80	11
5	9	79	12
6	8	79	13
7	8	79	13
8	7	79	14
9	7	78	15
10	7	78	15
11	7	77	16
12	7	77	16
13	7	76	17
14	7	76	17
15	7	76	17
16	7	76	17
17	7	75	18
18	8	74	18
19	8	74	18
20	8	73	19
21	8	73	19
22	8	72	20
23	8	71	21
24	8	70	22
25	7	70	23
26	7	69	24
27	7	68	25
28	7	67	26
29	6	67	27
30	6	67	27
31	5	67	28