São João da Boa Vista weather in December

In December, São João da Boa Vista sees average daytime highs of 28°C and overnight lows near 19°C, with 245 mm of rain across 23.4 wet days and about 13.3 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 12% of the time in December, and the air most often feels muggy.

Daylight stretches from about 13 h 12 min at the start of December to 13 h 18 min by month's end. Set against the rest of the year, December is São João da Boa Vista's 11th-clearest and 7th-windiest month. For the whole year in context, see São João da Boa Vista's year-round climate.

Daytime high
28°
4th warmest
Overnight low
19°
10th coldest
Rainfall
245 mm
23.4 wet days
Daylight
13 h 18 min
6:23 AM – 7:43 PM
Cloud cover
72%
11th clearest
Wind
7 km/h
7th windiest
Solar energy
5.83 kWh/m²
Travel score
4.4
out of 10

São João da Boa Vista 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 28°C through the month.

A typical December day in São João da Boa Vista reaches about 28°C in the afternoon and slips back to 19°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 31°C. Set against its neighbours, December runs on par with November and on par with January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12719
22819
32819
42819
52819
62819
72819
82819
92819
102819
112819
122819
132819
142819
152819
162819
172819
182819
192819
202819
212819
222819
232819
242819
252819
262819
272819
282819
292819
302819
312819

São João da Boa Vista weather by month

How December compares with the rest of the year at a glance. December is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°2822413.24.2
Feb28° / 19°21120.112.84.4
Mar28° / 18°1832012.25.0
Apr27° / 17°8010.211.56.7
May24° / 14°576.4117.7
Jun24° / 13°324.210.78.3
Jul24° / 12°273.310.88.5
Aug26° / 13°263.711.28.2
Sep27° / 16°778.711.96.9
Oct28° / 18°12214.712.55.5
Nov27° / 18°19119.413.14.9
Dec28° / 19°24523.413.34.4

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 19% of December, with mostly cloudy or overcast conditions the remaining 69%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23565
33367
43367
53367
63268
73268
83268
93268
103169
113169
123169
133268
143268
153169
163169
173268
183268
193268
203367
213367
223367
233268
243268
253169
262971
272971
282773
292773
302674
312674

Chance of precipitation in December

Any precipitation

São João da Boa Vista gets around 245 mm of rain over 23.4 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 75% and peaks near 79% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
169
270
370
471
571
672
772
873
973
1074
1174
1275
1375
1476
1576
1676
1776
1877
1977
2077
2178
2278
2378
2478
2579
2679
2779
2879
2979
3079
3179

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 59% of days. Sticky, muggy-or-worse air turns up on roughly 59% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11154143
21144045
31133947
41123849
51113751
61113652
71103554
8193456
9193357
10183358
11083260
12083260
13073261
14073261
15073261
16073261
17063361
18063361
19063361
20053461
21053461
22053461
23043462
24043462
25043363
26043264
27033265
28033166
29033166
30033067
31033067

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 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
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 12 min at the start of December to 13 h 18 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 6:20 AM to 6:31 AM, and sunset from 7:34 PM to 7:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.26:207:34
213.36:207:35
313.36:207:36
413.36:207:36
513.36:207:37
613.36:207:38
713.36:217:38
813.36:217:39
913.36:217:39
1013.36:217:40
1113.36:227:41
1213.36:227:41
1313.36:227:42
1413.36:237:42
1513.36:237:43
1613.36:237:43
1713.36:247:44
1813.36:247:44
1913.36:257:45
2013.36:257:45
2113.36:257:46
2213.36:267:46
2313.36:267:47
2413.36:277:47
2513.36:277:48
2613.36:287:48
2713.36:287:49
2813.36:297:49
2913.36:297:49
3013.36:307:50
3113.36:317:50

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.83 kWh/m².

For context, solar energy here swings from a low near 3.85 kWh/m² to a high of 5.91 kWh/m² in November across the year — December's 5.83 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.7Bright
295.7Bright
305.7Bright
315.7Bright
Planning a trip in December

Hazard calendar for São João da Boa Vista

In seasonPeak

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

São João da Boa Vista'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 João da Boa Vista?

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

4.4
Sightseeing
10th-best month of the year
4.6
Beach & pool
11th-best month of the year

December is a reasonable time to visit São João da Boa Vista for sightseeing.

What to pack for São João da Boa Vista in December

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

In December, São João da Boa Vista sees daytime highs around 28°C and nights near 19°C. Pack light clothes and rain gear. Worth having: sun protection. About 23 days see rain.

light clothesrain gearsun protection

UV index in São João da Boa Vista 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 João da Boa Vista peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 21UV 15Jul 10UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr10Very high
May7Very high
Jun6High
Jul6High
Aug8Very high
Sep8Very high
Oct12Extreme
Nov14Extreme
Dec14Extreme

Air quality in São João da Boa Vista 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 João da Boa Vista is worst in September — around 24 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (November, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1522 µg/m³Nov 239 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar10Good
Apr11Good
May11Good
Jun11Good
Jul11Good
Aug15Moderate
Sep24Moderate
Oct13Moderate
Nov9Good
Dec9Good
Location & terrain

Where is São João da Boa Vista?

São João da Boa Vista sits at 22.0°S, 46.8°W, 774 m above sea level, in Brazil. The nearest listed city is Vargem Grande do Sul, 18 km away.

Topography around São João da Boa Vista

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São João da Boa Vista.

Within 3 km, the terrain around São João da Boa Vista has only modest variations in elevation — a maximum elevation change of 119 m around an average of 766 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,001 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,260 m.

The land around São João da Boa Vista is covered by artificial surfaces (40%), grassland (27%) and trees (24%) within 3 km, trees (37%), grassland (33%) and cropland (26%) within 16 km, and trees (36%), grassland (32%) and cropland (29%) within 80 km.

3 km
119 m
16 km
1,001 m
80 km
1,260 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Vargem Grande do Sul 18 km · Aguaí 21 km · Espírito Santo do Pinhal 26 km · Andradas 26 km · Poços de Caldas 32 km · Casa Branca 37 km · Jacutinga 40 km · São José do Rio Pardo 43 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 João da Boa Vista (-21.9692°, -46.7981°, elevation 774 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).