Santa Inês weather in December

In December, Santa Inês sees average daytime highs of 33°C and overnight lows near 24°C, with 120 mm of rain across 15.4 wet days and about 12.2 hours of daylight. It is the 5th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 15% of the time in December, and the air most often feels oppressive.

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 Santa Inês's 7th-clearest and 5th-windiest month. For the whole year in context, see Santa Inês's year-round climate.

Daytime high
33°
5th warmest
Overnight low
24°
10th coldest
Rainfall
120 mm
15.4 wet days
Daylight
12 h 12 min
5:51 AM – 6:04 PM
Cloud cover
70%
7th clearest
Wind
8 km/h
5th windiest
Solar energy
5.32 kWh/m²
Travel score
2.8
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 33°C through the month.

A typical December day in Santa Inês reaches about 33°C in the afternoon and slips back to 24°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 35°C. Set against its neighbours, December runs about 1°C cooler than November and about 2°C warmer than January.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13425
23425
33425
43425
53425
63425
73425
83425
93425
103425
113425
123425
133425
143425
153324
163324
173324
183324
193324
203324
213324
223324
233324
243324
253324
263324
273324
283324
293324
303324
313224

How December really feels in Santa Inês

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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Santa Inês weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 24°25325.412.22.6
Feb31° / 24°27625.712.12.5
Mar31° / 24°34129.5122.4
Apr31° / 24°31027.911.92.5
May31° / 24°16321.511.83.2
Jun31° / 23°5511.711.84.2
Jul32° / 23°326.411.84.4
Aug34° / 23°122.811.93.8
Sep35° / 24°122.2123.2
Oct35° / 25°194.112.12.9
Nov34° / 25°49812.22.9
Dec33° / 24°12015.412.22.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 19% of December, with mostly cloudy or overcast conditions the remaining 66%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24456
34456
44456
54456
64159
74159
84060
93961
103961
113862
123664
133664
143565
153466
163367
173367
183268
193070
203070
212971
222971
232872
242872
252773
262575
272575
282575
292476
302476
312377

Chance of precipitation in December

Any precipitation

Santa Inês gets around 120 mm of rain over 15.4 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 50% and peaks near 69% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
133
233
334
434
535
636
737
838
939
1040
1142
1243
1345
1447
1548
1650
1752
1853
1955
2057
2158
2259
2361
2462
2563
2664
2765
2867
2968
3068
3169

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 81% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
18839
28839
38839
48839
58839
67849
77849
87849
96859
106859
1158510
1248610
1348511
1438611
1538512
1638413
1728414
1828315
1928216
2018217
2118118
2218019
2317821
2417722
2517623
2627424
2727325
2827226
2927127
3027028
3127028

Wind in December

Winds average 8 km/h in December.

Across December, daily wind ranges from about 7 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

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 5:45 AM to 5:58 AM, and sunset from 5:57 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:455:57
212.25:465:58
312.25:465:58
412.25:465:58
512.25:475:59
612.25:475:59
712.25:486:00
812.25:486:00
912.25:486:01
1012.25:496:01
1112.25:496:02
1212.25:506:02
1312.25:506:03
1412.25:506:03
1512.25:516:04
1612.25:516:04
1712.25:526:04
1812.25:526:05
1912.25:536:05
2012.25:536:06
2112.25:546:06
2212.25:546:07
2312.25:556:07
2412.25:556:08
2512.25:566:08
2612.25:566:09
2712.25:566:09
2812.25:576:10
2912.25:576:10
3012.25:586:11
3112.25:586:11

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.32 kWh/m².

For context, solar energy here swings from a low near 4.26 kWh/m² to a high of 6.11 kWh/m² in October across the year — December's 5.32 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.2Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
315.0Bright
Planning a trip in December

Hazard calendar for Santa Inês

In seasonPeak

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

Santa Inês's monsoon runs January–May, when most of the year's rain falls.

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

Is December a good time to visit Santa Inês?

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

2.8
Sightseeing
8th-best month of the year
5.2
Beach & pool
7th-best month of the year

December is a weaker month for outdoor sightseeing in Santa Inês.

What to pack for Santa Inês in December

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

In December, Santa Inês sees daytime highs around 33°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.

light clothesrain gearsun protection

UV index in Santa Inês in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

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

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 17UV 15Jul 17UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar16Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Santa Inês 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 Santa Inês is worst in November — around 25 µg/m³ PM2.5 (moderate), about 3.5× the cleanest month (July, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateNov 1724 µg/m³Jul 167 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb15Moderate
Mar15Moderate
Apr13Moderate
May10Good
Jun8Good
Jul7Good
Aug8Good
Sep10Good
Oct16Moderate
Nov25Moderate
Dec19Moderate
Location & terrain

Where is Santa Inês?

Santa Inês sits at 3.7°S, 45.4°W, 31 m above sea level, in Brazil. The nearest listed city is Pindaré-Mirim, 8.0 km away.

Topography around Santa Inês

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

Within 3 km, the terrain around Santa Inês has only modest variations in elevation — a maximum elevation change of 32 m around an average of 22 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 52 m; within 80 km, significant variations in elevation — a maximum elevation change of 286 m.

The land around Santa Inês is covered by grassland (43%), artificial surfaces (32%) and trees (23%) within 3 km, grassland (56%) and trees (32%) within 16 km, and grassland (60%) and trees (34%) within 80 km.

3 km
32 m
16 km
52 m
80 km
286 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Pindaré-Mirim 8.0 km · Monção 24 km · Bom Jardim 29 km · Pio XII 31 km · Santa Luzia 45 km · Penalva 47 km · Alto Alegre do Pindaré 52 km · Zé Doca 53 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 Santa Inês (-3.6667°, -45.38°, elevation 31 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).