Jaú weather in December

In December, Jaú sees average daytime highs of 30°C and overnight lows near 21°C, with 192 mm of rain across 20.3 wet days and about 13.3 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 16% of the time in December, and the air most often feels muggy.

Daylight stretches from about 13 h 18 min at the start of December to 13 h 18 min by month's end. Set against the rest of the year, December is Jaú's 11th-clearest and 6th-windiest month. For the whole year in context, see Jaú's year-round climate.

Daytime high
30°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
192 mm
20.3 wet days
Daylight
13 h 24 min
6:30 AM – 7:51 PM
Cloud cover
70%
11th clearest
Wind
9 km/h
6th windiest
Solar energy
5.89 kWh/m²
Travel score
3.9
out of 10

Jaú is human settlement in Brazil.

Air quality
Good
PM10 25 µg/m³ · 2014

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 30°C through the month.

A typical December day in Jaú reaches about 30°C in the afternoon and slips back to 21°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 33°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)
13020
23020
33020
43020
53020
63020
73020
83020
93020
103020
113020
123021
133021
143021
153021
163021
173021
183021
193021
203021
213021
223021
233021
243021
253021
263021
273021
283021
293021
303021
313021

Jaú weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 21°24722.113.23.7
Feb30° / 21°1801912.83.7
Mar30° / 20°13917.412.24.4
Apr29° / 19°58811.56.2
May26° / 16°566.310.97.5
Jun25° / 14°374.110.78.0
Jul26° / 14°273.510.88.2
Aug28° / 15°293.611.27.6
Sep29° / 17°647.411.96.0
Oct30° / 19°11012.612.54.8
Nov30° / 19°15615.513.14.4
Dec30° / 21°19220.313.33.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 18% of December, with mostly cloudy or overcast conditions the remaining 66%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13763
23565
33565
43367
53268
63367
73367
83367
93268
103367
113367
123466
133565
143664
153664
163664
173763
183763
193862
203862
213862
223862
233664
243565
253466
263367
273268
283268
292971
302971
312872

Chance of precipitation in December

Any precipitation

Jaú gets around 192 mm of rain over 20.3 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 66% and peaks near 68% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
158
259
360
461
562
663
764
864
965
1065
1166
1266
1367
1467
1567
1668
1768
1868
1968
2068
2167
2267
2367
2468
2568
2668
2768
2868
2968
3068
3168

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 77% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1110265112
219255213
318245314
418245215
517235415
617235316
716225417
816215517
915215518
1005205718
1105205718
1204195918
1304195918
1404186018
1504186018
1604176118
1704176118
1804176217
1903176218
2003166318
2103166318
2203166318
2303156319
2402156419
2502146420
2602146420
2702136421
2802136322
2901136323
3001136323
3101136224

Wind in December

Winds average 9 km/h in December.

Across December, 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
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 18 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 0 minutes over December. Sunrise moves from 6:26 AM to 6:37 AM, and sunset from 7:42 PM to 7:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.36:267:42
213.36:267:43
313.36:267:43
413.36:267:44
513.36:277:45
613.36:277:45
713.36:277:46
813.36:277:46
913.36:277:47
1013.36:287:48
1113.36:287:48
1213.36:287:49
1313.36:297:49
1413.46:297:50
1513.46:297:51
1613.46:307:51
1713.46:307:52
1813.46:307:52
1913.46:317:53
2013.46:317:53
2113.46:327:54
2213.46:327:54
2313.46:337:55
2413.46:337:55
2513.46:347:56
2613.46:347:56
2713.46:357:56
2813.46:357:57
2913.46:367:57
3013.46:367:57
3113.36:377:58

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.89 kWh/m².

For context, solar energy here swings from a low near 3.71 kWh/m² to a high of 6.01 kWh/m² in November across the year — December's 5.89 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.9Bright
55.9Bright
65.9Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.9Bright
165.9Bright
175.9Bright
185.9Bright
195.9Bright
205.9Bright
215.9Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.7Bright
Planning a trip in December

Hazard calendar for Jaú

In seasonPeak

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

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

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

Is December a good time to visit Jaú?

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

3.9
Sightseeing
10th-best month of the year
5.2
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Jaú.

What to pack for Jaú in December

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

In December, Jaú sees daytime highs around 30°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

UV index in Jaú 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 Jaú peaks around January 22 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 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 22UV 15Jul 11UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr10Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep9Very high
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Jaú 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 Jaú is worst in September — around 22 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (November, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1022 µg/m³Nov 239 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb10Good
Mar10Good
Apr11Good
May13Moderate
Jun14Moderate
Jul14Moderate
Aug22Moderate
Sep22Moderate
Oct17Moderate
Nov9Good
Dec9Good
Location & terrain

Where is Jaú?

Jaú sits at 22.3°S, 48.6°W, 528 m above sea level, in Brazil. The nearest listed city is Dois Córregos, 20 km away.

Topography around Jaú

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

Within 3 km, the terrain around Jaú has only modest variations in elevation — a maximum elevation change of 143 m around an average of 549 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 319 m; within 80 km, large variations in elevation — a maximum elevation change of 700 m.

The land around Jaú is covered by artificial surfaces (53%) within 3 km, cropland (70%) within 16 km, and cropland (50%) and trees (35%) within 80 km.

3 km
143 m
16 km
319 m
80 km
700 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Dois Córregos 20 km · Barra Bonita 22 km · Pederneiras 23 km · Igaraçu do Tietê 24 km · Macatuba 28 km · Bariri 31 km · Lençóis Paulista 42 km · Brotas 44 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 Jaú (-22.2964°, -48.5578°, elevation 528 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).