São Simão weather in December

In December, São Simão sees average daytime highs of 31°C and overnight lows near 23°C, with 241 mm of rain across 24.1 wet days and about 13.1 hours of daylight. It is the 6th-warmest and 2nd-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 12% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 13 h 06 min at the start of December to 13 h 06 min by month's end. Set against the rest of the year, December is São Simão's 11th-clearest and 9th-windiest month. For the whole year in context, see São Simão's year-round climate.

Daytime high
31°
6th warmest
Overnight low
23°
10th coldest
Rainfall
241 mm
24.1 wet days
Daylight
13 h 06 min
6:44 AM – 7:52 PM
Cloud cover
74%
11th clearest
Wind
7 km/h
9th windiest
Solar energy
5.9 kWh/m²
Travel score
3.1
out of 10

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 São Simão reaches about 31°C in the afternoon and slips back to 23°C overnight — a 8°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.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13123
23123
33123
43123
53123
63123
73123
83123
93123
103123
113123
123123
133123
143123
153123
163123
173123
183123
193123
203123
213123
223123
233123
243123
253123
263123
273123
283123
293123
303123
313023

How December really feels in São Simão

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.

São Simão weather by month

How December compares with the rest of the year at a glance. December is the 6th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°26723.8133.2
Feb31° / 23°20721.412.63.2
Mar31° / 22°19421.312.13.5
Apr30° / 21°721011.64.9
May29° / 19°284.411.16.5
Jun29° / 18°141.610.97.1
Jul29° / 17°80.9117.0
Aug31° / 19°101.711.45.6
Sep33° / 21°456.111.94.1
Oct33° / 22°11513.912.43.3
Nov31° / 22°18519.612.93.3
Dec31° / 23°24124.113.13.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 73%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22872
32674
42674
52575
62575
72476
82377
92377
102476
112476
122575
132575
142674
152773
162773
172872
182971
192971
202971
213070
223070
233070
243070
252872
262773
272773
282674
292674
302575
312575

Chance of precipitation in December

Any precipitation

São Simão gets around 241 mm of rain over 24.1 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 77% and peaks near 78% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
174
275
376
477
577
678
778
878
978
1078
1178
1278
1378
1478
1578
1677
1777
1877
1977
2077
2177
2277
2377
2477
2577
2678
2778
2878
2978
3078
3178

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 78% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1252370
2242272
3242173
4232174
5132175
6122077
7122077
8122077
9122077
10112177
11012178
12012178
13012277
14012277
15012277
16012277
17012178
18012178
19012178
20012178
21002080
22002080
23002080
24001981
25001882
26001882
27001783
28001783
29001684
30001684
31001684

Wind in December

Winds average 7 km/h in December.

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

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 06 min at the start of December to 13 h 06 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 6:40 AM to 6:51 AM, and sunset from 7:44 PM to 7:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.16:407:44
213.16:407:44
313.16:407:45
413.16:417:46
513.16:417:46
613.16:417:47
713.16:417:47
813.16:427:48
913.16:427:49
1013.16:427:49
1113.16:427:50
1213.16:437:50
1313.16:437:51
1413.16:437:51
1513.16:447:52
1613.16:447:52
1713.16:457:53
1813.16:457:53
1913.16:457:54
2013.16:467:55
2113.16:467:55
2213.16:477:55
2313.16:477:56
2413.16:487:56
2513.16:487:57
2613.16:497:57
2713.16:497:58
2813.16:507:58
2913.16:507:58
3013.16:517:59
3113.16:517:59

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.9 kWh/m².

For context, solar energy here swings from a low near 4.14 kWh/m² to a high of 6.27 kWh/m² in October across the year — December's 5.9 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.9Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.9Bright
185.9Bright
195.9Bright
205.9Bright
216.0Bright
226.0Bright
236.0Bright
246.0Bright
256.0Bright
266.0Bright
275.9Bright
285.9Bright
295.9Bright
305.9Bright
315.9Bright
Planning a trip in December

Hazard calendar for São Simão

In seasonPeak

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

São Simão's monsoon runs November–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 São Simão?

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

3.1
Sightseeing
12th-best month of the year
4.5
Beach & pool
12th-best month of the year

December is a weaker month for outdoor sightseeing in São Simão.

What to pack for São Simão in December

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

In December, São Simão sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

UV index in São Simão in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in São Simão peaks around January 24 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeJan 24UV 15Jun 21UV 7
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar14Extreme
Apr11Extreme
May8Very high
Jun7High
Jul7Very high
Aug9Very high
Sep11Extreme
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in São Simão 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 São Simão is worst in September — around 34 µg/m³ PM2.5 (moderate), about 6.1× the cleanest month (November, 6 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1632 µg/m³Nov 226 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb8Good
Mar8Good
Apr6Good
May6Good
Jun6Good
Jul7Good
Aug14Moderate
Sep34Moderate
Oct13Moderate
Nov6Good
Dec6Good
Location & terrain

Where is São Simão?

São Simão sits at 19.0°S, 50.5°W, 471 m above sea level, in Brazil. The nearest listed city is Santa Vitória, 48 km away.

Topography around São Simão

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

Within 3 km, the terrain around São Simão has only modest variations in elevation — a maximum elevation change of 106 m around an average of 449 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 208 m; within 80 km, significant variations in elevation — a maximum elevation change of 517 m.

The land around São Simão is covered by grassland (45%) and cropland (20%) within 3 km, cropland (40%) and grassland (35%) within 16 km, and cropland (50%) and grassland (30%) within 80 km.

3 km
106 m
16 km
208 m
80 km
517 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Santa Vitória 48 km · Quirinópolis 61 km · Iturama 90 km · Paranaíba 102 km · Ituiutaba 114 km · Bom Jesus de Goiás 121 km · Cassilândia 126 km · Campina Verde 126 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 São Simão (-18.9911°, -50.5436°, elevation 471 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).