Jundiaí weather in January

In January, Jundiaí sees average daytime highs of 28°C and overnight lows near 19°C, with 243 mm of rain across 22.2 wet days and about 13.3 hours of daylight. It is the 2nd-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 13% of the time in January, and the air most often feels muggy.

Daylight stretches from about 13 h 24 min at the start of January to 13 h 06 min by month's end. Set against the rest of the year, January is Jundiaí's 12th-clearest and 10th-windiest month. For the whole year in context, see Jundiaí's year-round climate.

Daytime high
28°
2nd warmest
Overnight low
19°
12th coldest
Rainfall
243 mm
22.2 wet days
Daylight
13 h 18 min
6:38 AM – 7:55 PM
Cloud cover
75%
12th clearest
Wind
10 km/h
10th windiest
Solar energy
5.5 kWh/m²
Travel score
4.4
out of 10

Jundiaí is human settlement in Brazil.

Air quality
Good
PM10 24.9 µg/m³ · 2019

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

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 Jundiaí 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 32°C. Set against its neighbours, January runs on par with December and on par with February.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12819
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

Jundiaí weather by month

How January compares with the rest of the year at a glance. January is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°24322.213.34.4
Feb28° / 19°16918.912.84.4
Mar28° / 19°13517.712.25.3
Apr26° / 17°648.811.56.9
May24° / 14°646.810.97.5
Jun23° / 13°495.210.67.8
Jul23° / 12°464.710.78.0
Aug25° / 13°374.511.28.1
Sep26° / 15°868.911.97.0
Oct27° / 17°11813.112.56.0
Nov27° / 18°15015.713.15.5
Dec28° / 19°18919.913.44.9

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of January, with mostly cloudy or overcast conditions the remaining 72%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32971
42773
52674
62674
72674
82674
92674
102773
112773
122773
132773
142773
152773
162773
172872
182872
192971
202971
212971
222971
232971
242971
253070
263070
273169
283169
293169
303268
313268

Chance of precipitation in January

Any precipitation

Jundiaí gets around 243 mm of rain over 22.2 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 71% and peaks near 72% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
168
268
369
469
570
670
771
872
972
1072
1172
1272
1372
1472
1572
1672
1772
1872
1972
2072
2172
2271
2371
2471
2571
2671
2771
2871
2971
3070
3170

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 73% of days. Sticky, muggy-or-worse air turns up on roughly 78% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1322696
2321706
3221716
4220717
5220717
6219727
7219727
8219727
9219727
10218737
11219727
12219736
13219736
14219736
15219736
16220735
17220735
18220735
19320725
20320734
21320734
22320734
23320734
24320734
25319744
26319744
27318754
28318745
29317755
30417745
31416755

Wind in January

Winds average 10 km/h in January.

Across January, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
299calm
309calm
319calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 13 h 24 min at the start of January to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over January. Sunrise moves from 6:29 AM to 6:49 AM, and sunset from 7:53 PM to 7:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.46:297:53
213.46:297:53
313.46:307:53
413.46:307:54
513.46:317:54
613.46:327:54
713.46:327:54
813.46:337:55
913.46:347:55
1013.36:347:55
1113.36:357:55
1213.36:367:55
1313.36:367:55
1413.36:377:55
1513.36:387:55
1613.36:387:55
1713.36:397:55
1813.36:407:55
1913.26:407:55
2013.26:417:55
2113.26:427:55
2213.26:437:55
2313.26:437:55
2413.26:447:55
2513.26:457:55
2613.26:457:54
2713.16:467:54
2813.16:477:54
2913.16:477:54
3013.16:487:53
3113.16:497:53

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 5.5 kWh/m².

For context, solar energy here swings from a low near 3.51 kWh/m² to a high of 5.84 kWh/m² in December across the year — January's 5.5 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.6Bright
285.6Bright
295.6Bright
305.6Bright
315.6Bright
Planning a trip in January

Hazard calendar for Jundiaí

In seasonPeak

In January, Jundiaí sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Jundiaí's rainy season runs October–March, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is January a good time to visit Jundiaí?

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
4.9
Beach & pool
12th-best month of the year

January is a reasonable time to visit Jundiaí for sightseeing.

What to pack for Jundiaí in January

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

In January, Jundiaí sees daytime highs around 28°C and nights near 19°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

UV index in Jundiaí in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 15 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Jundiaí peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (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 12UV 5
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug8Very high
Sep8Very high
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Jundiaí in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Jundiaí is worst in July — around 38 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (January, 18 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateJul 1838 µg/m³Jan 1018 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb20Moderate
Mar22Moderate
Apr26Moderate
May31Moderate
Jun35Poor
Jul38Poor
Aug36Poor
Sep35Poor
Oct25Moderate
Nov18Moderate
Dec18Moderate
Location & terrain

Where is Jundiaí?

Jundiaí sits at 23.2°S, 46.9°W, 753 m above sea level, in Brazil. The nearest listed city is Várzea Paulista, 6.0 km away.

Topography around Jundiaí

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

Within 3 km, the terrain around Jundiaí has only modest variations in elevation — a maximum elevation change of 133 m around an average of 739 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 643 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,206 m.

The land around Jundiaí is covered by artificial surfaces (70%) within 3 km, trees (56%) and grassland (24%) within 16 km, and trees (46%) and grassland (24%) within 80 km.

3 km
133 m
16 km
643 m
80 km
1,206 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Várzea Paulista 6.0 km · Campo Limpo Paulista 10 km · Louveira 13 km · Francisco Morato 18 km · Itupeva 18 km · Jarinu 19 km · Cajamar 19 km · Vinhedo 20 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 Jundiaí (-23.1864°, -46.8842°, elevation 753 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).