São Marcos in Summer
In summer (December, January and February), São Marcos sees average daytime highs around 26°C and overnight lows near 16°C, with 514 mm of rain over about 51 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 26°C. The sky is clear or mostly clear about 24% of the time across summer, and the air most often feels humid.
Summer is São Marcos's weakest season of the year to visit on our travel score. For the whole year in context, see São Marcos's year-round climate.
- Avg daytime high
- 26°C
- warmest season of the year
- Avg overnight low
- 16°C
- Rainfall
- 514 mm
- 51 wet days
- Avg wind
- 9 km/h
- Travel score
- 5.5
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in São Marcos in Summer
Across summer, daytime highs hold fairly steady around 26°C.
A typical summer day in São Marcos reaches about 26°C and drops to 16°C overnight. The warmest of the three months is January, the coolest December.
São Marcos 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 | 26° / 17° | 182 | 18 | 13.6 | 5.4 |
| Feb | 26° / 16° | 160 | 17.3 | 13 | 5.3 |
| Mar | 25° / 15° | 142 | 14.6 | 12.2 | 6.1 |
| Apr | 22° / 13° | 125 | 11.3 | 11.3 | 6.4 |
| May | 19° / 10° | 140 | 10.4 | 10.6 | 5.9 |
| Jun | 17° / 8° | 136 | 10.5 | 10.2 | 5.4 |
| Jul | 17° / 7° | 168 | 11 | 10.3 | 5.3 |
| Aug | 19° / 8° | 128 | 10.2 | 11 | 6.2 |
| Sep | 20° / 10° | 167 | 12.4 | 11.8 | 5.9 |
| Oct | 22° / 12° | 210 | 14.5 | 12.7 | 5.9 |
| Nov | 24° / 13° | 154 | 13.4 | 13.4 | 6.4 |
| Dec | 26° / 15° | 172 | 15.5 | 13.8 | 5.9 |
Cloud cover in Summer
The sky is clear or mostly clear about 24% of the time across summer.
Chance of precipitation in Summer
São Marcos gets around 514 mm of rain over 51 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 9 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 6.0 kWh/m².
Is summer a good time to visit São Marcos?
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 Marcos for sightseeing.
What to pack for São Marcos in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, São Marcos sees daytime highs around 26°C and nights near 16°C. Pack rain gear and sun protection. Worth having: light clothes. About 51 days see rain.
UV index in São Marcos 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 Marcos peaks around January 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 4 (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 | 4 | 4 | 6 | 8 | 8 | 12 | 13 |
| Level | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 13 | Extreme |
| Mar | 11 | Extreme |
| Apr | 8 | Very high |
| May | 5 | High |
| Jun | 4 | Moderate |
| Jul | 4 | Moderate |
| Aug | 6 | High |
| Sep | 8 | Very high |
| Oct | 8 | Very high |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Air quality in São Marcos 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 Marcos is worst in August — around 22 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (February, 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 | 9 | 10 | 11 | 12 | 12 | 15 | 22 | 18 | 12 | 11 | 10 |
| Level | Good | Good | Good | Good | Moderate | Good | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 9 | Good |
| Mar | 10 | Good |
| Apr | 11 | Good |
| May | 12 | Moderate |
| Jun | 12 | Good |
| Jul | 15 | Moderate |
| Aug | 22 | Moderate |
| Sep | 18 | Moderate |
| Oct | 12 | Good |
| Nov | 11 | Good |
| Dec | 10 | Good |
Where is São Marcos?
São Marcos sits at 29.0°S, 51.1°W, 741 m above sea level, in Brazil. The nearest listed city is Flores da Cunha, 13 km away.
Topography around São Marcos
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Marcos.
Within 3 km, the terrain around São Marcos has significant variations in elevation — a maximum elevation change of 399 m around an average of 750 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 716 m; within 80 km, large variations in elevation — a maximum elevation change of 1,135 m.
The land around São Marcos is covered by trees (55%) and grassland (27%) within 3 km, trees (65%) and grassland (30%) within 16 km, and trees (59%) and grassland (24%) 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 Marcos (-28.9711°, -51.0681°, elevation 741 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.