São José weather in January

In January, São José sees average daytime highs of 28°C and overnight lows near 20°C, with 234 mm of rain across 22.6 wet days and about 13.6 hours of daylight. It is the 1st-warmest and 1st-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 10% of the time in January, and the air most often feels muggy.

Daylight stretches from about 13 h 42 min at the start of January to 13 h 18 min by month's end. Set against the rest of the year, January is São José's 9th-clearest and 5th-windiest month. For the whole year in context, see São José's year-round climate.

Daytime high
28°
1st warmest
Overnight low
20°
11th coldest
Rainfall
234 mm
22.6 wet days
Daylight
13 h 36 min
6:37 AM – 8:11 PM
Cloud cover
74%
9th clearest
Wind
7 km/h
5th windiest
Solar energy
5.44 kWh/m²
Travel score
4.4
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical January day in São José reaches about 28°C in the afternoon and slips back to 20°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 32°C. Set against its neighbours, January runs about 1°C warmer than December and on par with February.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12820
22820
32820
42820
52820
62820
72820
82820
92820
102820
112820
122820
132820
142820
152820
162820
172820
182820
192820
202820
212820
222820
232820
242820
252820
262820
272820
282820
292820
302820
312820

São José weather by month

How January compares with the rest of the year at a glance. January is the 1st-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 20°23422.613.64.4
Feb28° / 20°21320.3134.4
Mar27° / 19°14919.612.25.0
Apr25° / 17°9512.211.46.4
May22° / 14°11310.810.76.6
Jun21° / 12°969.610.36.4
Jul20° / 11°899.510.46.4
Aug21° / 12°909.3116.6
Sep22° / 14°15013.511.85.8
Oct23° / 16°14315.512.75.6
Nov25° / 17°14716.613.45.5
Dec27° / 19°16718.913.75.0

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 15% of January, with mostly cloudy or overcast conditions the remaining 75%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12278
22278
32278
42278
52377
62377
72377
82377
92377
102377
112377
122476
132575
142575
152575
162575
172674
182674
192674
202674
212674
222773
232773
242773
252872
262971
272971
282971
293070
303169
313169

Chance of precipitation in January

Any precipitation

São José gets around 234 mm of rain over 22.6 wet days in January, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 72% and peaks near 73% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
170
270
371
471
572
673
773
873
973
1073
1173
1273
1373
1473
1572
1672
1772
1872
1972
2072
2172
2272
2372
2472
2572
2672
2772
2871
2971
3071
3171

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the muggy band about 40% of days. Sticky, muggy-or-worse air turns up on roughly 81% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
161741370
251641380
351641380
451641380
551541390
641542390
741442390
841442390
941443390
1041443390
1141443390
1241443390
1341443390
1441443380
1541543380
1641543380
1741542380
1841642380
1941641380
2041641380
2141640390
2241740400
2331739400
2431639410
2531638421
2631638431
2721637441
2821636451
2921536461
3021535461
3121535471

Wind in January

Winds average 7 km/h in January.

Across January, 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
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 January

DaylightNight

Daylight runs from about 13 h 42 min at the start of January to 13 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over January. Sunrise moves from 6:26 AM to 6:48 AM, and sunset from 8:09 PM to 8:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.76:268:09
213.76:278:09
313.76:278:10
413.76:288:10
513.76:298:10
613.76:298:10
713.76:308:10
813.76:318:11
913.76:328:11
1013.66:328:11
1113.66:338:11
1213.66:348:11
1313.66:348:11
1413.66:358:11
1513.66:368:11
1613.66:378:11
1713.66:378:11
1813.56:388:11
1913.56:398:11
2013.56:408:10
2113.56:418:10
2213.56:418:10
2313.56:428:10
2413.46:438:10
2513.46:448:09
2613.46:458:09
2713.46:458:09
2813.46:468:08
2913.46:478:08
3013.36:488:08
3113.36:488:07

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 5.44 kWh/m².

For context, solar energy here swings from a low near 2.61 kWh/m² to a high of 5.61 kWh/m² in December across the year — January's 5.44 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
315.3Bright
Planning a trip in January

Is January a good time to visit São José?

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

4.4
Sightseeing
11th-best month of the year
4.8
Beach & pool
6th-best month of the year

January is a reasonable time to visit São José for sightseeing.

What to pack for São José in January

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

In January, São José sees daytime highs around 28°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 23 days see rain.

light clothesrain gearsun protection

Sea temperature near São José in January

The nearest coast averages about 26°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 25 km away) is warmest in February at about 26°C and coldest in August near 18°C.

It's comfortable for a long swim from Oct 8 to Jun 8 — about 8 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmcomfortable to swimcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb26Warm
Mar25Warm
Apr24Refreshing
May22Refreshing
Jun20Cool
Jul18Cool
Aug18Cool
Sep19Cool
Oct21Refreshing
Nov22Refreshing
Dec24Warm

UV index in São José in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January 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 José peaks around January 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 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 11UV 5
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar11Extreme
Apr8Very high
May5High
Jun5Moderate
Jul5Moderate
Aug6High
Sep8Very high
Oct9Very high
Nov12Extreme
Dec13Extreme
Location & terrain

Where is São José?

São José sits at 27.6°S, 48.6°W, 18 m above sea level, in Brazil. The nearest listed city is Campinas, 3.0 km away.

Topography around São José

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

Within 3 km, the terrain around São José has only modest variations in elevation — a maximum elevation change of 170 m around an average of 14 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 993 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,813 m.

The land around São José is covered by water (40%) and artificial surfaces (37%) within 3 km, trees (39%) and water (32%) within 16 km, and trees (51%) and water (37%) within 80 km.

3 km
170 m
16 km
993 m
80 km
1,813 m
treesgrasslandcroplandartificial surfaceswatermangroves
January weather nearby: Campinas 3.0 km · Palhoça 5.0 km · Florianopolis 8.0 km · Trindade 11 km · Pantanal 11 km · Freguesia do Ribeirao da Ilha 13 km · Ribeirão da Ilha 13 km · Biguaçu 14 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 José (-27.6153°, -48.6275°, elevation 18 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).