São Borja in Summer
In summer (December, January and February), São Borja sees average daytime highs around 31°C and overnight lows near 21°C, with 448 mm of rain over about 34 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 31°C. The sky is clear or mostly clear about 45% of the time across summer, and the air most often feels oppressive.
Summer is São Borja's weakest season of the year to visit on our travel score. For the whole year in context, see São Borja's year-round climate.
- Avg daytime high
- 31°C
- warmest season of the year
- Avg overnight low
- 21°C
- Rainfall
- 448 mm
- 34 wet days
- Avg wind
- 12 km/h
- Travel score
- 4.2
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in São Borja in Summer
Across summer, daytime highs hold fairly steady around 31°C.
A typical summer day in São Borja reaches about 31°C and drops to 21°C overnight. The warmest of the three months is January, the coolest December.
How summer really feels in São Borja
Once humidity and wind are folded in, summer brings about 77 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
São Borja 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 | 32° / 22° | 159 | 11.9 | 13.6 | 3.9 |
| Feb | 31° / 21° | 132 | 11.2 | 13 | 4.3 |
| Mar | 30° / 20° | 128 | 10.2 | 12.2 | 5.2 |
| Apr | 27° / 17° | 165 | 10.1 | 11.3 | 6.7 |
| May | 23° / 14° | 119 | 8.3 | 10.6 | 7.1 |
| Jun | 21° / 12° | 117 | 9.2 | 10.2 | 6.5 |
| Jul | 20° / 11° | 113 | 8.8 | 10.4 | 6.7 |
| Aug | 23° / 12° | 103 | 8.5 | 11 | 7.2 |
| Sep | 24° / 14° | 151 | 10.1 | 11.8 | 7.0 |
| Oct | 27° / 16° | 210 | 11.5 | 12.7 | 6.4 |
| Nov | 29° / 18° | 155 | 9 | 13.4 | 5.7 |
| Dec | 31° / 20° | 157 | 10.6 | 13.8 | 4.4 |
Cloud cover in Summer
The sky is clear or mostly clear about 45% of the time across summer.
Chance of precipitation in Summer
São Borja gets around 448 mm of rain over 34 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 12 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 42 min in early December to 12 h 42 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 6.5 kWh/m².
Is summer a good time to visit São Borja?
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 São Borja for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for São Borja in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, São Borja sees daytime highs around 31°C and nights near 21°C. Pack light clothes and sun protection. Worth having: rain gear. About 34 days see rain.
UV index in São Borja in Summer
Clear-sky midday UV across summer averages around 13 (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 Borja peaks around January 21 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (moderate).
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 | 13 | 11 | 8 | 5 | 3 | 4 | 5 | 8 | 5 | 11 | 12 |
| Level | Extreme | Extreme | Extreme | Very high | Moderate | Moderate | Moderate | Moderate | Very high | High | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 13 | Extreme |
| Mar | 11 | Extreme |
| Apr | 8 | Very high |
| May | 5 | Moderate |
| Jun | 3 | Moderate |
| Jul | 4 | Moderate |
| Aug | 5 | Moderate |
| Sep | 8 | Very high |
| Oct | 5 | High |
| Nov | 11 | Extreme |
| Dec | 12 | Extreme |
Air quality in São Borja 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 São Borja is worst in September — around 16 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (March, 6 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) | 8 | 14 | 6 | 7 | 6 | 7 | 10 | 15 | 16 | 9 | 9 | 6 |
| Level | Good | Moderate | Good | Good | Good | Good | Good | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 14 | Moderate |
| Mar | 6 | Good |
| Apr | 7 | Good |
| May | 6 | Good |
| Jun | 7 | Good |
| Jul | 10 | Good |
| Aug | 15 | Moderate |
| Sep | 16 | Moderate |
| Oct | 9 | Good |
| Nov | 9 | Good |
| Dec | 6 | Good |
Where is São Borja?
São Borja sits at 28.7°S, 56.0°W, 98 m above sea level, in Brazil. The nearest listed city is Santo Tomé, 13 km away.
Topography around São Borja
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Borja.
Within 3 km, the terrain around São Borja has only modest variations in elevation — a maximum elevation change of 43 m around an average of 79 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 80 m; within 80 km, significant variations in elevation — a maximum elevation change of 276 m.
The land around São Borja is covered by artificial surfaces (26%) and cropland (24%) within 3 km, cropland (47%) within 16 km, and grassland (39%) and cropland (25%) 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 São Borja (-28.6606°, -56.0044°, elevation 98 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.