São Francisco do Sul weather in December

In December, São Francisco do Sul sees average daytime highs of 28°C and overnight lows near 21°C, with 193 mm of rain across 20.7 wet days and about 13.6 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Highs climb over the month, from about 27°C in the first days to 29°C by the end. The sky is clear or mostly clear about 11% of the time in December, and the air most often feels muggy.

Daylight stretches from about 13 h 30 min at the start of December to 13 h 36 min by month's end. Set against the rest of the year, December is São Francisco do Sul's 9th-clearest and 3rd-windiest month. For the whole year in context, see São Francisco do Sul's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
21°
9th coldest
Rainfall
193 mm
20.7 wet days
Daylight
13 h 36 min
6:22 AM – 8:00 PM
Cloud cover
77%
9th clearest
Wind
7 km/h
3rd windiest
Solar energy
5.23 kWh/m²
Travel score
4.3
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 27°C in the first days to 29°C by the end.

A typical December day in São Francisco do Sul reaches about 28°C in the afternoon and slips back to 21°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 33°C. Set against its neighbours, December runs about 2°C warmer than November and about 1°C cooler than January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12720
22720
32720
42720
52720
62820
72820
82820
92820
102820
112821
122821
132821
142821
152821
162821
172821
182821
192921
202921
212921
222921
232921
242921
252921
262921
272921
282922
292922
302922
312922

How December really feels in São Francisco do Sul

Once humidity and wind are folded in, December averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

São Francisco do Sul weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 22°27924.413.53.6
Feb29° / 22°25521.612.93.6
Mar28° / 21°20222.412.24.3
Apr26° / 19°11614.111.45.8
May24° / 16°10712.210.76.5
Jun22° / 14°1041010.46.6
Jul21° / 13°899.910.56.5
Aug22° / 14°879.311.16.7
Sep23° / 16°14514.611.85.8
Oct24° / 18°14917.312.65.4
Nov26° / 19°16117.713.35.1
Dec28° / 21°19320.713.64.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 77%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12476
22575
32575
42377
52377
62377
72377
82377
92377
102278
112278
122476
132377
142377
152377
162476
172476
182377
192476
202476
212476
222476
232476
242476
252377
262377
272278
282179
292278
302278
312278

Chance of precipitation in December

Any precipitation

São Francisco do Sul gets around 193 mm of rain over 20.7 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 67% and peaks near 72% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
161
262
362
463
563
663
764
864
965
1065
1165
1266
1366
1466
1567
1667
1767
1868
1968
2068
2169
2269
2369
2470
2570
2670
2771
2871
2971
3071
3172

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 39% of days. Sticky, muggy-or-worse air turns up on roughly 80% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
172545220
272545230
372445240
462445250
562345260
662244270
762244280
852144300
952044310
1051943320
1151843330
1241743350
1341743360
1441642381
1541541391
1641441401
1741440421
1831339432
1931338442
2031337452
2131236463
2231236473
2321135474
2421134484
2521134494
2621133505
2721032515
2811032525
2911031535
3011031535
3111031526

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
48calm
58calm
68calm
78calm
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 30 min at the start of December to 13 h 36 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 6:19 AM to 6:29 AM, and sunset from 7:50 PM to 8:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.56:197:50
213.56:197:51
313.56:197:51
413.66:197:52
513.66:197:53
613.66:197:54
713.66:197:54
813.66:197:55
913.66:207:56
1013.66:207:56
1113.66:207:57
1213.66:207:57
1313.66:217:58
1413.66:217:59
1513.66:217:59
1613.66:228:00
1713.66:228:00
1813.66:228:01
1913.66:238:01
2013.66:238:02
2113.66:248:02
2213.66:248:03
2313.66:258:03
2413.66:258:04
2513.66:268:04
2613.66:268:05
2713.66:278:05
2813.66:278:05
2913.66:288:06
3013.66:288:06
3113.66:298:06

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.23 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.53 kWh/m² to a high of 5.23 kWh/m² in December across the year — December's 5.23 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
315.2Bright
Planning a trip in December

Is December a good time to visit São Francisco do Sul?

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

4.3
Sightseeing
9th-best month of the year
5.0
Beach & pool
3rd-best month of the year

December is a reasonable time to visit São Francisco do Sul for sightseeing.

What to pack for São Francisco do Sul in December

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

In December, São Francisco do Sul sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 21 days see rain.

light clothesrain gearsun protection

Sea temperature near São Francisco do Sul in December

The nearest coast averages about 25°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 15 km away) is warmest in February at about 27°C and coldest in August near 18°C.

It's comfortable for a long swim from Sep 26 to Jun 19 — about 8.8 months when the water holds above 20°C.

20°25°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swimcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar26Warm
Apr25Warm
May22Refreshing
Jun20Refreshing
Jul19Cool
Aug18Cool
Sep20Cool
Oct21Refreshing
Nov23Refreshing
Dec25Warm

UV index in São Francisco do Sul 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 São Francisco do Sul peaks around January 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighModerateHighVery highExtremeJan 18UV 14Jul 12UV 5
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar11Extreme
Apr8Very high
May6High
Jun5High
Jul5Moderate
Aug6High
Sep9Very high
Oct10Very high
Nov12Extreme
Dec13Extreme

Air quality in São Francisco do Sul 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 Francisco do Sul is worst in August — around 15 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (February, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1115 µg/m³Feb 229 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb9Good
Mar9Good
Apr10Good
May12Good
Jun14Moderate
Jul15Moderate
Aug15Moderate
Sep14Moderate
Oct12Good
Nov9Good
Dec9Good
Location & terrain

Where is São Francisco do Sul?

São Francisco do Sul sits at 26.2°S, 48.6°W, 16 m above sea level, in Brazil. The nearest listed city is Itapoá, 14 km away.

Topography around São Francisco do Sul

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

Within 3 km, the terrain around São Francisco do Sul has only modest variations in elevation — a maximum elevation change of 146 m around an average of 9 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 580 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,647 m.

The land around São Francisco do Sul is covered by water (53%) and trees (26%) within 3 km, trees (51%) and water (36%) within 16 km, and trees (55%) and water (33%) within 80 km.

3 km
146 m
16 km
580 m
80 km
1,647 m
treesgrasslandcroplandartificial surfaceswaterwetlandmangroves
December weather nearby: Itapoá 14 km · Araquari 16 km · Joinville 22 km · Garuva 32 km · Guaratuba 41 km · Barra Velha 43 km · Guaramirim 44 km · Matinhos 47 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 Francisco do Sul (-26.2433°, -48.6381°, elevation 16 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).