Barreiras in Summer
In summer (December, January and February), Barreiras sees average daytime highs around 30°C and overnight lows near 21°C, with 401 mm of rain over about 47 wet days across the season. It is the coldest 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 19% of the time across summer, and the air most often feels muggy.
Summer is Barreiras's 3rd-best season to visit on our travel score. For the whole year in context, see Barreiras's year-round climate.
- Avg daytime high
- 30°C
- coldest season of the year
- Avg overnight low
- 21°C
- Rainfall
- 401 mm
- 47 wet days
- Avg wind
- 6 km/h
- Travel score
- 4.2
- 3rd-best season
- Months
- Dec · Jan · Feb
Temperature in Barreiras in Summer
Across summer, daytime highs hold fairly steady around 30°C.
A typical summer day in Barreiras reaches about 30°C and drops to 21°C overnight. The warmest of the three months is December, the coolest February.
How summer really feels in Barreiras
Once humidity and wind are folded in, summer brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Barreiras 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° | 139 | 16.5 | 12.6 | 4.2 |
| Feb | 30° / 21° | 120 | 15.7 | 12.4 | 4.2 |
| Mar | 30° / 21° | 142 | 16.5 | 12.1 | 4.2 |
| Apr | 30° / 20° | 68 | 10.2 | 11.7 | 4.8 |
| May | 30° / 20° | 18 | 3.2 | 11.4 | 5.7 |
| Jun | 30° / 18° | 2 | 0.3 | 11.3 | 6.4 |
| Jul | 30° / 17° | 0 | 0 | 11.4 | 6.5 |
| Aug | 31° / 18° | 1 | 0.1 | 11.6 | 5.6 |
| Sep | 33° / 20° | 8 | 1.1 | 11.9 | 4.2 |
| Oct | 33° / 22° | 51 | 6.5 | 12.3 | 3.6 |
| Nov | 31° / 21° | 154 | 14.2 | 12.6 | 3.9 |
| Dec | 30° / 21° | 143 | 14.7 | 12.7 | 4.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 19% of the time across summer.
Chance of precipitation in Summer
Barreiras gets around 401 mm of rain over 47 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 6 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 42 min in early December to 12 h 18 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 5.8 kWh/m².
Hazard calendar for Barreiras
In summer, Barreiras overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Barreiras's rainy season runs November–March, when most of the year's rain falls.
Is summer a good time to visit Barreiras?
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 reasonable time to visit Barreiras for sightseeing.
What to pack for Barreiras in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Barreiras sees daytime highs around 30°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 47 days see rain.
UV index in Barreiras 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 Barreiras peaks around February 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 9 (very 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) | 14 | 15 | 15 | 12 | 10 | 9 | 9 | 10 | 12 | 12 | 14 | 13 |
| Level | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 15 | Extreme |
| Mar | 15 | Extreme |
| Apr | 12 | Extreme |
| May | 10 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 10 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 14 | Extreme |
| Dec | 13 | Extreme |
Air quality in Barreiras 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 Barreiras is worst in September — around 25 µg/m³ PM2.5 (moderate), about 5.7× the cleanest month (July, 4 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) | 6 | 7 | 7 | 6 | 5 | 5 | 4 | 6 | 25 | 24 | 9 | 9 |
| Level | Good | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 7 | Good |
| Mar | 7 | Good |
| Apr | 6 | Good |
| May | 5 | Good |
| Jun | 5 | Good |
| Jul | 4 | Good |
| Aug | 6 | Good |
| Sep | 25 | Moderate |
| Oct | 24 | Moderate |
| Nov | 9 | Good |
| Dec | 9 | Good |
Where is Barreiras?
Barreiras sits at 12.2°S, 45.0°W, 472 m above sea level, in Brazil. The nearest listed city is São Desidério, 23 km away.
Topography around Barreiras
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Barreiras.
Within 3 km, the terrain around Barreiras has significant variations in elevation — a maximum elevation change of 272 m around an average of 483 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 315 m; within 80 km, significant variations in elevation — a maximum elevation change of 397 m.
The land around Barreiras is covered by artificial surfaces (46%) and trees (24%) within 3 km, shrubs (40%) and trees (37%) within 16 km, and shrubs (48%) and trees (23%) 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 Barreiras (-12.1528°, -44.99°, elevation 472 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.