Sinop weather in December

In December, Sinop sees average daytime highs of 30°C and overnight lows near 22°C, with 296 mm of rain across 27.6 wet days and about 12.7 hours of daylight. It is the 10th-warmest and 2nd-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 3% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of December to 12 h 42 min by month's end. Set against the rest of the year, December is Sinop's 11th-clearest and 9th-windiest month. For the whole year in context, see Sinop's year-round climate.

Daytime high
30°
10th warmest
Overnight low
22°
9th coldest
Rainfall
296 mm
27.6 wet days
Daylight
12 h 42 min
6:17 AM – 6:59 PM
Cloud cover
85%
11th clearest
Wind
5 km/h
9th windiest
Solar energy
4.9 kWh/m²
Travel score
3.0
out of 10

Sinop is human settlement in Brazil.

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical December day in Sinop reaches about 30°C in the afternoon and slips back to 22°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 32°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13022
23022
33022
43022
53022
63022
73022
83022
93022
103022
113022
123022
133022
143022
153022
163022
173022
183022
193022
203022
213022
223022
233022
243022
253022
263022
272922
282922
292922
302922
312922

How December really feels in Sinop

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.

Sinop weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 22°30528.712.62.9
Feb30° / 22°27926.412.42.8
Mar30° / 22°25627.112.12.9
Apr31° / 22°13019.611.73.6
May31° / 21°316.511.54.7
Jun32° / 20°50.911.35.2
Jul32° / 20°10.411.45.1
Aug34° / 21°71.311.63.9
Sep34° / 22°538.711.93.2
Oct32° / 22°14620.212.33.0
Nov30° / 22°23225.212.52.9
Dec30° / 22°29627.612.73.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 9% of December, with mostly cloudy or overcast conditions the remaining 89%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11090
21090
31090
41090
51090
61090
71189
81189
91090
101090
111090
121090
131090
141189
151189
161189
171189
181189
191387
201387
211387
221387
231387
241387
251387
261387
271387
281387
291387
301189
311189

Chance of precipitation in December

Any precipitation

Sinop gets around 296 mm of rain over 27.6 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 90% and peaks near 92% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
189
289
389
489
589
689
789
890
990
1090
1190
1290
1390
1490
1590
1689
1789
1889
1989
2089
2189
2289
2389
2489
2589
2690
2790
2891
2991
3092
3192

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 99% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
10991
20991
30991
40991
51981
61990
71990
81990
91990
101990
111990
121990
132980
142980
152980
162980
172980
182980
192980
202980
211990
221990
231990
241990
251990
261990
271990
281990
291981
301981
311981

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 36 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 6 minutes over December. Sunrise moves from 6:12 AM to 6:25 AM, and sunset from 6:51 PM to 7:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:126:51
212.76:136:52
312.76:136:52
412.76:136:53
512.76:136:53
612.76:146:54
712.76:146:54
812.76:146:55
912.76:156:55
1012.76:156:56
1112.76:156:56
1212.76:166:57
1312.76:166:57
1412.76:176:58
1512.76:176:58
1612.76:176:59
1712.76:186:59
1812.76:187:00
1912.76:197:00
2012.76:197:01
2112.76:207:01
2212.76:207:02
2312.76:217:02
2412.76:217:03
2512.76:227:03
2612.76:227:04
2712.76:237:04
2812.76:237:05
2912.76:247:05
3012.76:247:05
3112.76:257:06

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.9 kWh/m².

For context, solar energy here swings from a low near 4.8 kWh/m² to a high of 5.83 kWh/m² in September across the year — December's 4.9 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
15.0Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
304.9Bright
314.8Bright
Planning a trip in December

Hazard calendar for Sinop

In seasonPeak

In December, Sinop sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Sinop's monsoon runs October–March, 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 Sinop?

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

3.0
Sightseeing
7th-best month of the year
4.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Sinop.

What to pack for Sinop in December

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

In December, Sinop sees daytime highs around 30°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 28 days see rain.

light clothesrain gearsun protection

UV index in Sinop in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sinop peaks around February 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 14 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 12UV 15Sep 14UV 8
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar14Extreme
Apr12Extreme
May10Very high
Jun8Very high
Jul9Very high
Aug10Very high
Sep7Very high
Oct11Extreme
Nov13Extreme
Dec13Extreme

Air quality in Sinop 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 Sinop is worst in September — around 60 µg/m³ PM2.5 (unhealthy), about 5.8× the cleanest month (April, 10 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModeratePoorModerateSep 1656 µg/m³Apr 1511 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb12Good
Mar12Moderate
Apr10Good
May13Moderate
Jun18Moderate
Jul13Moderate
Aug25Moderate
Sep60Unhealthy
Oct29Moderate
Nov17Moderate
Dec12Good
Location & terrain

Where is Sinop?

Sinop sits at 11.9°S, 55.5°W, 378 m above sea level, in Brazil. The nearest listed city is Sorriso, 79 km away.

Topography around Sinop

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

Within 3 km, the terrain around Sinop has only modest variations in elevation — a maximum elevation change of 50 m around an average of 375 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 85 m; within 80 km, only modest variations in elevation — a maximum elevation change of 203 m.

The land around Sinop is covered by artificial surfaces (59%) within 3 km, cropland (53%) and trees (30%) within 16 km, and trees (47%) and cropland (47%) within 80 km.

3 km
50 m
16 km
85 m
80 km
203 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Sorriso 79 km · Colíder 116 km · Lucas do Rio Verde 141 km · Tapurah 147 km · Peixoto de Azevedo 191 km · Matupá 198 km · Guarantã do Norte 222 km · Nova Mutum 227 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 Sinop (-11.8642°, -55.5025°, elevation 378 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).