Jaú in Summer
In summer (December, January and February), Jaú sees average daytime highs around 30°C and overnight lows near 21°C, with 619 mm of rain over about 61 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 30°C. The sky is clear or mostly clear about 17% of the time across summer, and the air most often feels muggy.
Summer is Jaú's weakest season of the year to visit on our travel score. For the whole year in context, see Jaú's year-round climate.
- Avg daytime high
- 30°C
- warmest season of the year
- Avg overnight low
- 21°C
- Rainfall
- 619 mm
- 61 wet days
- Avg wind
- 8 km/h
- Travel score
- 3.8
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Jaú in Summer
Across summer, daytime highs hold fairly steady around 30°C.
A typical summer day in Jaú reaches about 30°C and drops to 21°C overnight. The warmest of the three months is February, the coolest December.
Jaú weather by month
How the three summer months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 30° / 21° | 247 | 22.1 | 13.2 | 3.7 |
| Feb | 30° / 21° | 180 | 19 | 12.8 | 3.7 |
| Mar | 30° / 20° | 139 | 17.4 | 12.2 | 4.4 |
| Apr | 29° / 19° | 58 | 8 | 11.5 | 6.2 |
| May | 26° / 16° | 56 | 6.3 | 10.9 | 7.5 |
| Jun | 25° / 14° | 37 | 4.1 | 10.7 | 8.0 |
| Jul | 26° / 14° | 27 | 3.5 | 10.8 | 8.2 |
| Aug | 28° / 15° | 29 | 3.6 | 11.2 | 7.6 |
| Sep | 29° / 17° | 64 | 7.4 | 11.9 | 6.0 |
| Oct | 30° / 19° | 110 | 12.6 | 12.5 | 4.8 |
| Nov | 30° / 19° | 156 | 15.5 | 13.1 | 4.4 |
| Dec | 30° / 21° | 192 | 20.3 | 13.3 | 3.9 |
Cloud cover in Summer
The sky is clear or mostly clear about 17% of the time across summer.
Chance of precipitation in Summer
Jaú gets around 619 mm of rain over 61 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 8 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 18 min in early December to 12 h 30 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.7 kWh/m².
Hazard calendar for Jaú
In summer, Jaú overlaps 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.
Is summer a good time to visit Jaú?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Jaú.
What to pack for Jaú in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Jaú sees daytime highs around 30°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 61 days see rain.
UV index in Jaú in Summer
Clear-sky midday UV across summer averages 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 15 | 15 | 13 | 10 | 7 | 6 | 6 | 8 | 9 | 11 | 13 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | High | Very high | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 15 | Extreme |
| Mar | 13 | Extreme |
| Apr | 10 | Very high |
| May | 7 | High |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 8 | Very high |
| Sep | 9 | Very high |
| Oct | 11 | Extreme |
| Nov | 13 | Extreme |
| Dec | 14 | Extreme |
Air quality in Jaú in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 10 | 10 | 10 | 11 | 13 | 14 | 14 | 22 | 22 | 17 | 9 | 9 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 10 | Good |
| Mar | 10 | Good |
| Apr | 11 | Good |
| May | 13 | Moderate |
| Jun | 14 | Moderate |
| Jul | 14 | Moderate |
| Aug | 22 | Moderate |
| Sep | 22 | Moderate |
| Oct | 17 | Moderate |
| Nov | 9 | Good |
| Dec | 9 | Good |
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.
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
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.