Santo Antônio do Içá weather in December

In December, Santo Antônio do Içá sees average daytime highs of 31°C and overnight lows near 24°C, with 266 mm of rain across 28.8 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 1% of the time in December, and the air most often feels miserable.

Daylight stretches from about 12 h 12 min at the start of December to 12 h 12 min by month's end. Set against the rest of the year, December is Santo Antônio do Içá's 7th-clearest and 8th-windiest month. For the whole year in context, see Santo Antônio do Içá's year-round climate.

Daytime high: 31°; 4th warmest
Overnight low: 24°; 11th coldest
Rainfall: 266 mm; 28.8 wet days
Daylight: 12 h 12 min; 6:23 AM – 6:33 PM
Cloud cover: 85%; 7th clearest
Wind: 4 km/h; 8th windiest
Solar energy: 4.56 kWh/m²
Travel score: 2.6; out of 10

Santo Antônio do Içá is human settlement in Brazil.

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

← November Santo Antônio do Içá 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 31°C through the month.

A typical December day in Santo Antônio do Içá reaches about 31°C in the afternoon and slips back to 24°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 33°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)	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	30	30	30	30	30	30	30	30	30	30	30
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	24	23	23	23	24	24	24

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

How December really feels in Santo Antônio do Içá

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.

Santo Antônio do Içá weather by month

How December compares with the rest of the year at a glance. December is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	30° / 24°	277	28.3	12.2	2.7
Feb	30° / 24°	276	25.5	12.1	2.7
Mar	30° / 24°	323	29.1	12	2.6
Apr	30° / 23°	326	28.2	11.9	2.7
May	30° / 23°	301	28.8	11.9	2.9
Jun	29° / 23°	206	26.1	11.8	3.2
Jul	30° / 22°	154	24.8	11.8	3.4
Aug	31° / 23°	130	23.3	11.9	3.3
Sep	31° / 23°	143	23	12	2.9
Oct	31° / 24°	188	25.6	12.1	2.7
Nov	31° / 24°	219	26.2	12.1	2.6
Dec	31° / 24°	266	28.8	12.2	2.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 6% of December, with mostly cloudy or overcast conditions the remaining 92%.

	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 (%)	10	10	10	10	10	10	9	9	9	8	8	8	7	7	6	6	6	6	6	6	6	6	6	6	7	7	7	7	7	7	7
Cloudier (%)	90	90	90	90	90	90	91	91	91	92	92	92	93	93	94	94	94	94	94	94	94	94	94	94	93	93	93	93	93	93	93

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	10	90
4	10	90
5	10	90
6	10	90
7	9	91
8	9	91
9	9	91
10	8	92
11	8	92
12	8	92
13	7	93
14	7	93
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	7	93
31	7	93

Chance of precipitation in December

Any precipitation

Santo Antônio do Içá gets around 266 mm of rain over 28.8 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 93% and peaks near 94% 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 (%)	91	91	91	92	92	92	92	92	92	92	93	93	93	93	93	93	94	94	94	94	94	94	94	94	93	93	93	93	93	93	93

	Rain chance (%)
1	91
2	91
3	91
4	92
5	92
6	92
7	92
8	92
9	92
10	92
11	93
12	93
13	93
14	93
15	93
16	93
17	94
18	94
19	94
20	94
21	94
22	94
23	94
24	94
25	93
26	93
27	93
28	93
29	93
30	93
31	93

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the miserable band about 74% of days. Sticky, muggy-or-worse air turns up on roughly 100% 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
Oppressive (%)	20	20	20	20	20	21	21	21	22	23	23	24	25	26	26	27	28	28	29	29	29	29	30	30	29	29	30	30	30	30	31
Miserable (%)	80	80	80	80	80	79	79	79	78	77	77	76	75	74	74	73	72	72	71	71	71	71	70	70	71	71	70	70	70	70	69

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

Wind in December

Winds average 4 km/h in December.

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

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 12 min at the start of December to 12 h 12 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 6:17 AM to 6:30 AM, and sunset from 6:27 PM to 6:40 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)	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2
Sunrise (AM)	6:17	6:17	6:17	6:18	6:18	6:18	6:19	6:19	6:20	6:20	6:20	6:21	6:21	6:22	6:22	6:23	6:23	6:23	6:24	6:24	6:25	6:25	6:26	6:26	6:27	6:27	6:28	6:28	6:29	6:29	6:30
Sunset (PM)	6:27	6:27	6:27	6:28	6:28	6:29	6:29	6:30	6:30	6:30	6:31	6:31	6:32	6:32	6:33	6:33	6:34	6:34	6:35	6:35	6:36	6:36	6:37	6:37	6:38	6:38	6:38	6:39	6:39	6:40	6:40

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.2	6:17	6:27
2	12.2	6:17	6:27
3	12.2	6:17	6:27
4	12.2	6:18	6:28
5	12.2	6:18	6:28
6	12.2	6:18	6:29
7	12.2	6:19	6:29
8	12.2	6:19	6:30
9	12.2	6:20	6:30
10	12.2	6:20	6:30
11	12.2	6:20	6:31
12	12.2	6:21	6:31
13	12.2	6:21	6:32
14	12.2	6:22	6:32
15	12.2	6:22	6:33
16	12.2	6:23	6:33
17	12.2	6:23	6:34
18	12.2	6:23	6:34
19	12.2	6:24	6:35
20	12.2	6:24	6:35
21	12.2	6:25	6:36
22	12.2	6:25	6:36
23	12.2	6:26	6:37
24	12.2	6:26	6:37
25	12.2	6:27	6:38
26	12.2	6:27	6:38
27	12.2	6:28	6:38
28	12.2	6:28	6:39
29	12.2	6:29	6:39
30	12.2	6:29	6:40
31	12.2	6:30	6:40

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.56 kWh/m².

For context, solar energy here swings from a low near 3.72 kWh/m² to a high of 5.19 kWh/m² in October across the year — December's 4.56 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)	4.7	4.7	4.7	4.7	4.7	4.7	4.7	4.7	4.7	4.6	4.6	4.6	4.6	4.6	4.6	4.6	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.7	Bright
2	4.7	Bright
3	4.7	Bright
4	4.7	Bright
5	4.7	Bright
6	4.7	Bright
7	4.7	Bright
8	4.7	Bright
9	4.7	Bright
10	4.6	Bright
11	4.6	Bright
12	4.6	Bright
13	4.6	Bright
14	4.6	Bright
15	4.6	Bright
16	4.6	Bright
17	4.5	Bright
18	4.5	Bright
19	4.5	Bright
20	4.5	Bright
21	4.5	Bright
22	4.5	Bright
23	4.5	Bright
24	4.5	Bright
25	4.5	Bright
26	4.5	Bright
27	4.5	Bright
28	4.5	Bright
29	4.5	Bright
30	4.5	Bright
31	4.5	Bright

Planning a trip in December

Is December a good time to visit Santo Antônio do Içá?

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

2.6

Sightseeing

10th-best month of the year

3.7

Beach & pool

10th-best month of the year

December is a weaker month for outdoor sightseeing in Santo Antônio do Içá.

What to pack for Santo Antônio do Içá in December

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

In December, Santo Antônio do Içá sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 29 days see rain.

light clothesrain gearsun protection

UV index in Santo Antônio do Içá 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 Santo Antônio do Içá peaks around March 10 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 9 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)	15	15	15	14	13	11	10	10	10	12	13	12
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	Extreme	Extreme	Extreme

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

Air quality in Santo Antônio do Içá in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Santo Antônio do Içá is worst in August — around 18 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (June, 9 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	14	15	16	13	10	9	11	18	16	13	13	12
Level	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	14	Moderate
Feb	15	Moderate
Mar	16	Moderate
Apr	13	Moderate
May	10	Good
Jun	9	Good
Jul	11	Good
Aug	18	Moderate
Sep	16	Moderate
Oct	13	Moderate
Nov	13	Moderate
Dec	12	Moderate

Location & terrain

Where is Santo Antônio do Içá?

Santo Antônio do Içá sits at 3.1°S, 67.9°W, 68 m above sea level, in Brazil. The nearest listed city is Tonantins, 30 km away.

Topography around Santo Antônio do Içá

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Santo Antônio do Içá.

Within 3 km, the terrain around Santo Antônio do Içá has only modest variations in elevation — a maximum elevation change of 61 m around an average of 65 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 73 m; within 80 km, only modest variations in elevation — a maximum elevation change of 92 m.

The land around Santo Antônio do Içá is covered by trees (52%) and water (38%) within 3 km, trees (82%) within 16 km, and trees (96%) within 80 km.

3 km

61 m

trees 52%

16 km

73 m

trees 82%

80 km

92 m

trees 96%

treesgrasslandartificial surfaceswater

← November Santo Antônio do Içá year-round climate January →Best places to visit in December

December weather nearby: Tonantins 30 km · São Paulo de Olivença 108 km · Fonte Boa 215 km · Carauari 229 km · Leticia 254 km · Tabatinga 255 km · Benjamin Constant 272 km · Atalaia do Norte 287 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 Santo Antônio do Içá (-3.1022°, -67.9397°, elevation 68 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).

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

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	10	90
4	10	90
5	10	90
6	10	90
7	9	91
8	9	91
9	9	91
10	8	92
11	8	92
12	8	92
13	7	93
14	7	93
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	7	93
31	7	93

	Rain chance (%)
1	91
2	91
3	91
4	92
5	92
6	92
7	92
8	92
9	92
10	92
11	93
12	93
13	93
14	93
15	93
16	93
17	94
18	94
19	94
20	94
21	94
22	94
23	94
24	94
25	93
26	93
27	93
28	93
29	93
30	93
31	93

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

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

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	10	90
4	10	90
5	10	90
6	10	90
7	9	91
8	9	91
9	9	91
10	8	92
11	8	92
12	8	92
13	7	93
14	7	93
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	7	93
31	7	93

	Rain chance (%)
1	91
2	91
3	91
4	92
5	92
6	92
7	92
8	92
9	92
10	92
11	93
12	93
13	93
14	93
15	93
16	93
17	94
18	94
19	94
20	94
21	94
22	94
23	94
24	94
25	93
26	93
27	93
28	93
29	93
30	93
31	93

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

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

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	10	90
4	10	90
5	10	90
6	10	90
7	9	91
8	9	91
9	9	91
10	8	92
11	8	92
12	8	92
13	7	93
14	7	93
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	7	93
31	7	93

	Rain chance (%)
1	91
2	91
3	91
4	92
5	92
6	92
7	92
8	92
9	92
10	92
11	93
12	93
13	93
14	93
15	93
16	93
17	94
18	94
19	94
20	94
21	94
22	94
23	94
24	94
25	93
26	93
27	93
28	93
29	93
30	93
31	93

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